Merge tag 'gpio-v3.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO update from Linus Walleij:
"This is the bulk of GPIO changes for the v3.17 development cycle, and
this time we got a lot of action going on and it will continue:

- The core GPIO library implementation has been split up in three
different files:
- gpiolib.c for the latest and greatest and shiny GPIO library code
using GPIO descriptors only
- gpiolib-legacy.c for the old integer number space API that we are
phasing out gradually
- gpiolib-sysfs.c for the sysfs interface that we are not entirely
happy with, but has to live on for ABI compatibility

- Add a flags argument to *gpiod_get* functions, with some
backward-compatibility macros to ease transitions. We should have
had the flags there from the beginning it seems, now we need to
clean up the mess. There is a plan on how to move forward here
devised by Alexandre Courbot and Mark Brown

- Split off a special <linux/gpio/machine.h> header for the board
gpio table registration, as per example from the regulator
subsystem

- Start to kill off the return value from gpiochip_remove() by
removing the __must_check attribute and removing all checks inside
the drivers/gpio directory. The rationale is: well what were we
supposed to do if there is an error code? Not much: print an error
message. And gpiolib already does that. So make this function
return void eventually

- Some cleanups of hairy gpiolib code, make some functions not to be
used outside the library private and make sure they are not
exported, remove gpiod_lock/unlock_as_irq() as the existing
function is for driver-internal use and fine as it is, delete
gpio_ensure_requested() as it is not meaningful anymore

- Support the GPIOF_ACTIVE_LOW flag from gpio_request_one() function
calls, which is logical since this is already supported when
referencing GPIOs from e.g. device trees

- Switch STMPE, intel-mid, lynxpoint and ACPI (!) to use the gpiolib
irqchip helpers cutting down on GPIO irqchip boilerplate a bit more

- New driver for the Zynq GPIO block

- The usual incremental improvements around a bunch of drivers

- Janitorial syntactic and semantic cleanups by Jingoo Han, and
Rickard Strandqvist especially"

* tag 'gpio-v3.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (37 commits)
MAINTAINERS: update GPIO include files
gpio: add missing includes in machine.h
gpio: add flags argument to gpiod_get*() functions
MAINTAINERS: Update Samsung pin control entry
gpio / ACPI: Move event handling registration to gpiolib irqchip helpers
gpio: lynxpoint: Convert to use gpiolib irqchip
gpio: split gpiod board registration into machine header
gpio: remove gpio_ensure_requested()
gpio: remove useless check in gpiolib_sysfs_init()
gpiolib: Export gpiochip_request_own_desc and gpiochip_free_own_desc
gpio: move gpio_ensure_requested() into legacy C file
gpio: remove gpiod_lock/unlock_as_irq()
gpio: make gpiochip_get_desc() gpiolib-private
gpio: simplify gpiochip_export()
gpio: remove export of private of_get_named_gpio_flags()
gpio: Add support for GPIOF_ACTIVE_LOW to gpio_request_one functions
gpio: zynq: Clear pending interrupt when enabling a IRQ
gpio: drop retval check enforcing from gpiochip_remove()
gpio: remove all usage of gpio_remove retval in driver/gpio
devicetree: Add Zynq GPIO devicetree bindings documentation
...

Documentation/devicetree/bindings/gpio/gpio-zynq.txt

···
+Xilinx Zynq GPIO controller Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- #gpio-cells 		: Should be two
+			  - First cell is the GPIO line number
+			  - Second cell is used to specify optional
+			    parameters (unused)
+- compatible		: Should be "xlnx,zynq-gpio-1.0"
+- clocks		: Clock specifier (see clock bindings for details)
+- gpio-controller	: Marks the device node as a GPIO controller.
+- interrupts		: Interrupt specifier (see interrupt bindings for
+			  details)
+- interrupt-parent	: Must be core interrupt controller
+- reg			: Address and length of the register set for the device
+
+Example:
+	gpio@e000a000 {
+		#gpio-cells = <2>;
+		compatible = "xlnx,zynq-gpio-1.0";
+		clocks = <&clkc 42>;
+		gpio-controller;
+		interrupt-parent = <&intc>;
+		interrupts = <0 20 4>;
+		reg = <0xe000a000 0x1000>;
+	};

Documentation/gpio/board.txt

···
 Finally, GPIOs can be bound to devices and functions using platform data. Board
 files that desire to do so need to include the following header:
 
-	#include <linux/gpio/driver.h>
+	#include <linux/gpio/machine.h>
 
 GPIOs are mapped by the means of tables of lookups, containing instances of the
 gpiod_lookup structure. Two macros are defined to help declaring such mappings:

Documentation/gpio/consumer.txt

···
 device that will use the GPIO and the function the requested GPIO is supposed to
 fulfill:
 
-	struct gpio_desc *gpiod_get(struct device *dev, const char *con_id)
+	struct gpio_desc *gpiod_get(struct device *dev, const char *con_id,
+				    enum gpiod_flags flags)
 
 If a function is implemented by using several GPIOs together (e.g. a simple LED
 device that displays digits), an additional index argument can be specified:
 
 	struct gpio_desc *gpiod_get_index(struct device *dev,
-					  const char *con_id, unsigned int idx)
+					  const char *con_id, unsigned int idx,
+					  enum gpiod_flags flags)
+
+The flags parameter is used to optionally specify a direction and initial value
+for the GPIO. Values can be:
+
+* GPIOD_ASIS or 0 to not initialize the GPIO at all. The direction must be set
+  later with one of the dedicated functions.
+* GPIOD_IN to initialize the GPIO as input.
+* GPIOD_OUT_LOW to initialize the GPIO as output with a value of 0.
+* GPIOD_OUT_HIGH to initialize the GPIO as output with a value of 1.
 
 Both functions return either a valid GPIO descriptor, or an error code checkable
 with IS_ERR() (they will never return a NULL pointer). -ENOENT will be returned
···
 
 Device-managed variants of these functions are also defined:
 
-	struct gpio_desc *devm_gpiod_get(struct device *dev, const char *con_id)
+	struct gpio_desc *devm_gpiod_get(struct device *dev, const char *con_id,
+					 enum gpiod_flags flags)
 
 	struct gpio_desc *devm_gpiod_get_index(struct device *dev,
 					       const char *con_id,
-					       unsigned int idx)
+					       unsigned int idx,
+					       enum gpiod_flags flags)
 
 A GPIO descriptor can be disposed of using the gpiod_put() function:
 
···
 
 Setting Direction
 -----------------
-The first thing a driver must do with a GPIO is setting its direction. This is
-done by invoking one of the gpiod_direction_*() functions:
+The first thing a driver must do with a GPIO is setting its direction. If no
+direction-setting flags have been given to gpiod_get*(), this is done by
+invoking one of the gpiod_direction_*() functions:
 
 	int gpiod_direction_input(struct gpio_desc *desc)
 	int gpiod_direction_output(struct gpio_desc *desc, int value)

Documentation/gpio/driver.txt

···
 Input GPIOs can be used as IRQ signals. When this happens, a driver is requested
 to mark the GPIO as being used as an IRQ:
 
-	int gpiod_lock_as_irq(struct gpio_desc *desc)
+	int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
 
 This will prevent the use of non-irq related GPIO APIs until the GPIO IRQ lock
 is released:
 
-	void gpiod_unlock_as_irq(struct gpio_desc *desc)
+	void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
 
 When implementing an irqchip inside a GPIO driver, these two functions should
 typically be called in the .startup() and .shutdown() callbacks from the
 irqchip.
+
+
+Requesting self-owned GPIO pins
+-------------------------------
+
+Sometimes it is useful to allow a GPIO chip driver to request its own GPIO
+descriptors through the gpiolib API. Using gpio_request() for this purpose
+does not help since it pins the module to the kernel forever (it calls
+try_module_get()). A GPIO driver can use the following functions instead
+to request and free descriptors without being pinned to the kernel forever.
+
+	int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
+
+	void gpiochip_free_own_desc(struct gpio_desc *desc)
+
+Descriptors requested with gpiochip_request_own_desc() must be released with
+gpiochip_free_own_desc().
+
+These functions must be used with care since they do not affect module use
+count. Do not use the functions to request gpio descriptors not owned by the
+calling driver.

MAINTAINERS

···
 S:	Maintained
 F:	Documentation/gpio/
 F:	drivers/gpio/
-F:	include/linux/gpio*
+F:	include/linux/gpio/
+F:	include/linux/gpio.h
 F:	include/asm-generic/gpio.h
 
 GRE DEMULTIPLEXER DRIVER
···
 L:	[e-mail] (moderated for non-subscribers)
 L:	[e-mail] (moderated for non-subscribers)
 S:	Maintained
-F:	drivers/pinctrl/pinctrl-exynos.*
-F:	drivers/pinctrl/pinctrl-s3c*
-F:	drivers/pinctrl/pinctrl-samsung.*
+F:	drivers/pinctrl/samsung/
 
 PIN CONTROLLER - ST SPEAR
 M:	Viresh Kumar <[e-mail]>

arch/arm/mach-at91/at91rm9200_devices.c

···
 
 #include <linux/dma-mapping.h>
 #include <linux/gpio.h>
-#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
 #include <linux/platform_device.h>
 #include <linux/i2c-gpio.h>
 

arch/arm/mach-tegra/board-paz00.c

···
  *
  */
 
-#include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
 #include <linux/platform_device.h>
 #include <linux/rfkill-gpio.h>
 

arch/mips/jz4740/board-qi_lb60.c

···
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 
 #include <linux/input.h>
 #include <linux/gpio_keys.h>

drivers/gpio/Kconfig

···
 	help
 	  Say yes here to support the Xilinx FPGA GPIO device
 
+config GPIO_ZYNQ
+	tristate "Xilinx Zynq GPIO support"
+	depends on ARCH_ZYNQ
+	select GPIOLIB_IRQCHIP
+	help
+	  Say yes here to support Xilinx Zynq GPIO controller.
+
 config GPIO_XTENSA
 	bool "Xtensa GPIO32 support"
 	depends on XTENSA
···
 config GPIO_LYNXPOINT
 	tristate "Intel Lynxpoint GPIO support"
 	depends on ACPI && X86
-	select IRQ_DOMAIN
+	select GPIOLIB_IRQCHIP
 	help
 	  driver for GPIO functionality on Intel Lynxpoint PCH chipset
 	  Requires ACPI device enumeration code to set up a platform device.
···
 config GPIO_STMPE
 	bool "STMPE GPIOs"
 	depends on MFD_STMPE
+	select GPIOLIB_IRQCHIP
 	help
 	  This enables support for the GPIOs found on the STMPE I/O
 	  Expanders.

drivers/gpio/Makefile

···
 
 obj-$(CONFIG_GPIO_DEVRES)	+= devres.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
+obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
+obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o
 obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
 
 # Device drivers. Generally keep list sorted alphabetically
···
 obj-$(CONFIG_GPIO_XILINX)	+= gpio-xilinx.o
 obj-$(CONFIG_GPIO_XTENSA)	+= gpio-xtensa.o
 obj-$(CONFIG_GPIO_ZEVIO)	+= gpio-zevio.o
+obj-$(CONFIG_GPIO_ZYNQ)		+= gpio-zynq.o

drivers/gpio/devres.c

···
  * devm_gpiod_get - Resource-managed gpiod_get()
  * @dev:	GPIO consumer
  * @con_id:	function within the GPIO consumer
+ * @flags:	optional GPIO initialization flags
  *
  * Managed gpiod_get(). GPIO descriptors returned from this function are
  * automatically disposed on driver detach. See gpiod_get() for detailed
  * information about behavior and return values.
  */
-struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
-					      const char *con_id)
+struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev,
+					      const char *con_id,
+					      enum gpiod_flags flags)
 {
-	return devm_gpiod_get_index(dev, con_id, 0);
+	return devm_gpiod_get_index(dev, con_id, 0, flags);
 }
-EXPORT_SYMBOL(devm_gpiod_get);
+EXPORT_SYMBOL(__devm_gpiod_get);
 
 /**
  * devm_gpiod_get_optional - Resource-managed gpiod_get_optional()
  * @dev: GPIO consumer
  * @con_id: function within the GPIO consumer
+ * @flags: optional GPIO initialization flags
  *
  * Managed gpiod_get_optional(). GPIO descriptors returned from this function
  * are automatically disposed on driver detach. See gpiod_get_optional() for
  * detailed information about behavior and return values.
  */
-struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
-						       const char *con_id)
+struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev,
+						       const char *con_id,
+						       enum gpiod_flags flags)
 {
-	return devm_gpiod_get_index_optional(dev, con_id, 0);
+	return devm_gpiod_get_index_optional(dev, con_id, 0, flags);
 }
-EXPORT_SYMBOL(devm_gpiod_get_optional);
+EXPORT_SYMBOL(__devm_gpiod_get_optional);
 
 /**
  * devm_gpiod_get_index - Resource-managed gpiod_get_index()
  * @dev:	GPIO consumer
  * @con_id:	function within the GPIO consumer
  * @idx:	index of the GPIO to obtain in the consumer
+ * @flags:	optional GPIO initialization flags
  *
  * Managed gpiod_get_index(). GPIO descriptors returned from this function are
  * automatically disposed on driver detach. See gpiod_get_index() for detailed
  * information about behavior and return values.
  */
-struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
+struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev,
 						    const char *con_id,
-						    unsigned int idx)
+						    unsigned int idx,
+						    enum gpiod_flags flags)
 {
 	struct gpio_desc **dr;
 	struct gpio_desc *desc;
···
 	if (!dr)
 		return ERR_PTR(-ENOMEM);
 
-	desc = gpiod_get_index(dev, con_id, idx);
+	desc = gpiod_get_index(dev, con_id, idx, flags);
 	if (IS_ERR(desc)) {
 		devres_free(dr);
 		return desc;
···
 
 	return desc;
 }
-EXPORT_SYMBOL(devm_gpiod_get_index);
+EXPORT_SYMBOL(__devm_gpiod_get_index);
 
 /**
  * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional()
  * @dev: GPIO consumer
  * @con_id: function within the GPIO consumer
  * @index: index of the GPIO to obtain in the consumer
+ * @flags: optional GPIO initialization flags
  *
  * Managed gpiod_get_index_optional(). GPIO descriptors returned from this
  * function are automatically disposed on driver detach. See
  * gpiod_get_index_optional() for detailed information about behavior and
  * return values.
  */
-struct gpio_desc *__must_check devm_gpiod_get_index_optional(struct device *dev,
+struct gpio_desc *__must_check __devm_gpiod_get_index_optional(struct device *dev,
 							     const char *con_id,
-							     unsigned int index)
+							     unsigned int index,
+							 enum gpiod_flags flags)
 {
 	struct gpio_desc *desc;
 
-	desc = devm_gpiod_get_index(dev, con_id, index);
+	desc = devm_gpiod_get_index(dev, con_id, index, flags);
 	if (IS_ERR(desc)) {
 		if (PTR_ERR(desc) == -ENOENT)
 			return NULL;
···
 
 	return desc;
 }
-EXPORT_SYMBOL(devm_gpiod_get_index_optional);
+EXPORT_SYMBOL(__devm_gpiod_get_index_optional);
 
 /**
  * devm_gpiod_put - Resource-managed gpiod_put()

drivers/gpio/gpio-74x164.c

···
 static int gen_74x164_remove(struct spi_device *spi)
 {
 	struct gen_74x164_chip *chip = spi_get_drvdata(spi);
-	int ret;
 
-	ret = gpiochip_remove(&chip->gpio_chip);
-	if (!ret)
-		mutex_destroy(&chip->lock);
+	gpiochip_remove(&chip->gpio_chip);
+	mutex_destroy(&chip->lock);
 
-	return ret;
+	return 0;
 }
 
 static const struct of_device_id gen_74x164_dt_ids[] = {

drivers/gpio/gpio-adnp.c

···
 {
 	struct adnp *adnp = i2c_get_clientdata(client);
 	struct device_node *np = client->dev.of_node;
-	int err;
 
-	err = gpiochip_remove(&adnp->gpio);
-	if (err < 0) {
-		dev_err(&client->dev, "%s failed: %d\n", "gpiochip_remove()",
-			err);
-		return err;
-	}
-
+	gpiochip_remove(&adnp->gpio);
 	if (of_find_property(np, "interrupt-controller", NULL))
 		adnp_irq_teardown(adnp);
 

drivers/gpio/gpio-adp5520.c

···
 static int adp5520_gpio_remove(struct platform_device *pdev)
 {
 	struct adp5520_gpio *dev;
-	int ret;
 
 	dev = platform_get_drvdata(pdev);
-	ret = gpiochip_remove(&dev->gpio_chip);
-	if (ret) {
-		dev_err(&pdev->dev, "%s failed, %d\n",
-				"gpiochip_remove()", ret);
-		return ret;
-	}
+	gpiochip_remove(&dev->gpio_chip);
 
 	return 0;
 }

drivers/gpio/gpio-adp5588.c

···
 	if (dev->irq_base)
 		free_irq(dev->client->irq, dev);
 
-	ret = gpiochip_remove(&dev->gpio_chip);
-	if (ret) {
-		dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
-		return ret;
-	}
+	gpiochip_remove(&dev->gpio_chip);
 
 	kfree(dev);
 	return 0;

drivers/gpio/gpio-amd8111.c

···
 
 static void __exit amd_gpio_exit(void)
 {
-	int err = gpiochip_remove(&gp.chip);
-	WARN_ON(err);
+	gpiochip_remove(&gp.chip);
 	ioport_unmap(gp.pm);
 	release_region(gp.pmbase + PMBASE_OFFSET, PMBASE_SIZE);
 }

drivers/gpio/gpio-arizona.c

···
 {
 	struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&arizona_gpio->gpio_chip);
+	gpiochip_remove(&arizona_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver arizona_gpio_driver = {

drivers/gpio/gpio-cs5535.c

···
 static int cs5535_gpio_remove(struct platform_device *pdev)
 {
 	struct resource *r;
-	int err;
 
-	err = gpiochip_remove(&cs5535_gpio_chip.chip);
-	if (err) {
-		/* uhh? */
-		dev_err(&pdev->dev, "unable to remove gpio_chip?\n");
-		return err;
-	}
+	gpiochip_remove(&cs5535_gpio_chip.chip);
 
 	r = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	release_region(r->start, resource_size(r));

drivers/gpio/gpio-da9052.c

···
 {
 	struct da9052_gpio *gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&gpio->gp);
+	gpiochip_remove(&gpio->gp);
+	return 0;
 }
 
 static struct platform_driver da9052_gpio_driver = {

drivers/gpio/gpio-da9055.c

···
 {
 	struct da9055_gpio *gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&gpio->gp);
+	gpiochip_remove(&gpio->gp);
+	return 0;
 }
 
 static struct platform_driver da9055_gpio_driver = {

drivers/gpio/gpio-dwapb.c

···
 
 	for (m = 0; m < gpio->nr_ports; ++m)
 		if (gpio->ports[m].is_registered)
-			WARN_ON(gpiochip_remove(&gpio->ports[m].bgc.gc));
+			gpiochip_remove(&gpio->ports[m].bgc.gc);
 }
 
 static int dwapb_gpio_probe(struct platform_device *pdev)

drivers/gpio/gpio-em.c

···
 static int em_gio_remove(struct platform_device *pdev)
 {
 	struct em_gio_priv *p = platform_get_drvdata(pdev);
-	int ret;
 
-	ret = gpiochip_remove(&p->gpio_chip);
-	if (ret)
-		return ret;
+	gpiochip_remove(&p->gpio_chip);
 
 	irq_domain_remove(p->irq_domain);
 	return 0;

drivers/gpio/gpio-f7188x.c

···
 err_gpiochip:
 	for (i = i - 1; i >= 0; i--) {
 		struct f7188x_gpio_bank *bank = &data->bank[i];
-		int tmp;
-
-		tmp = gpiochip_remove(&bank->chip);
-		if (tmp < 0)
-			dev_err(&pdev->dev,
-				"Failed to remove gpiochip %d: %d\n",
-				i, tmp);
+		gpiochip_remove(&bank->chip);
 	}
 
 	return err;
···
 
 static int f7188x_gpio_remove(struct platform_device *pdev)
 {
-	int err;
 	int i;
 	struct f7188x_gpio_data *data = platform_get_drvdata(pdev);
 
 	for (i = 0; i < data->nr_bank; i++) {
 		struct f7188x_gpio_bank *bank = &data->bank[i];
-
-		err = gpiochip_remove(&bank->chip);
-		if (err) {
-			dev_err(&pdev->dev,
-				"Failed to remove GPIO gpiochip %d: %d\n",
-				i, err);
-			return err;
-		}
+		gpiochip_remove(&bank->chip);
 	}
 
 	return 0;

drivers/gpio/gpio-generic.c

···
 
 int bgpio_remove(struct bgpio_chip *bgc)
 {
-	return gpiochip_remove(&bgc->gc);
+	gpiochip_remove(&bgc->gc);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(bgpio_remove);
 

drivers/gpio/gpio-grgpio.c

···
 		}
 	}
 
-	ret = gpiochip_remove(&priv->bgc.gc);
-	if (ret)
-		goto out;
+	gpiochip_remove(&priv->bgc.gc);
 
 	if (priv->domain)
 		irq_domain_remove(priv->domain);

drivers/gpio/gpio-ich.c

···
 
 static int ichx_gpio_remove(struct platform_device *pdev)
 {
-	int err;
-
-	err = gpiochip_remove(&ichx_priv.chip);
-	if (err) {
-		dev_err(&pdev->dev, "%s failed, %d\n",
-				"gpiochip_remove()", err);
-		return err;
-	}
+	gpiochip_remove(&ichx_priv.chip);
 
 	ichx_gpio_release_regions(ichx_priv.gpio_base, ichx_priv.use_gpio);
 	if (ichx_priv.pm_base)

drivers/gpio/gpio-intel-mid.c

···
 #include <linux/stddef.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
-#include <linux/irq.h>
 #include <linux/io.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
-#include <linux/irqdomain.h>
 
 #define INTEL_MID_IRQ_TYPE_EDGE		(1 << 0)
 #define INTEL_MID_IRQ_TYPE_LEVEL	(1 << 1)
···
 	void __iomem			*reg_base;
 	spinlock_t			lock;
 	struct pci_dev			*pdev;
-	struct irq_domain		*domain;
 };
 
-#define to_intel_gpio_priv(chip) container_of(chip, struct intel_mid_gpio, chip)
+static inline struct intel_mid_gpio *to_intel_gpio_priv(struct gpio_chip *gc)
+{
+	return container_of(gc, struct intel_mid_gpio, chip);
+}
 
 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
 			      enum GPIO_REG reg_type)
···
 	return 0;
 }
 
-static int intel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct intel_mid_gpio *priv = to_intel_gpio_priv(chip);
-	return irq_create_mapping(priv->domain, offset);
-}
-
 static int intel_mid_irq_type(struct irq_data *d, unsigned type)
 {
-	struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct intel_mid_gpio *priv = to_intel_gpio_priv(gc);
 	u32 gpio = irqd_to_hwirq(d);
 	unsigned long flags;
 	u32 value;
···
 {
 }
 
-static int intel_mid_irq_reqres(struct irq_data *d)
-{
-	struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
-
-	if (gpio_lock_as_irq(&priv->chip, irqd_to_hwirq(d))) {
-		dev_err(priv->chip.dev,
-			"unable to lock HW IRQ %lu for IRQ\n",
-			irqd_to_hwirq(d));
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static void intel_mid_irq_relres(struct irq_data *d)
-{
-	struct intel_mid_gpio *priv = irq_data_get_irq_chip_data(d);
-
-	gpio_unlock_as_irq(&priv->chip, irqd_to_hwirq(d));
-}
-
 static struct irq_chip intel_mid_irqchip = {
 	.name		= "INTEL_MID-GPIO",
 	.irq_mask	= intel_mid_irq_mask,
 	.irq_unmask	= intel_mid_irq_unmask,
 	.irq_set_type	= intel_mid_irq_type,
-	.irq_request_resources = intel_mid_irq_reqres,
-	.irq_release_resources = intel_mid_irq_relres,
 };
 
 static const struct intel_mid_gpio_ddata gpio_lincroft = {
···
 
 static void intel_mid_irq_handler(unsigned irq, struct irq_desc *desc)
 {
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct intel_mid_gpio *priv = to_intel_gpio_priv(gc);
 	struct irq_data *data = irq_desc_get_irq_data(desc);
-	struct intel_mid_gpio *priv = irq_data_get_irq_handler_data(data);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
 	u32 base, gpio, mask;
 	unsigned long pending;
···
 			mask = BIT(gpio);
 			/* Clear before handling so we can't lose an edge */
 			writel(mask, gedr);
-			generic_handle_irq(irq_find_mapping(priv->domain,
+			generic_handle_irq(irq_find_mapping(gc->irqdomain,
 							    base + gpio));
 		}
 	}
···
 		writel(~0, reg);
 	}
 }
-
-static int intel_gpio_irq_map(struct irq_domain *d, unsigned int irq,
-			    irq_hw_number_t hwirq)
-{
-	struct intel_mid_gpio *priv = d->host_data;
-
-	irq_set_chip_and_handler(irq, &intel_mid_irqchip, handle_simple_irq);
-	irq_set_chip_data(irq, priv);
-	irq_set_irq_type(irq, IRQ_TYPE_NONE);
-
-	return 0;
-}
-
-static const struct irq_domain_ops intel_gpio_irq_ops = {
-	.map = intel_gpio_irq_map,
-	.xlate = irq_domain_xlate_twocell,
-};
 
 static int intel_gpio_runtime_idle(struct device *dev)
 {
···
 	priv->chip.direction_output = intel_gpio_direction_output;
 	priv->chip.get = intel_gpio_get;
 	priv->chip.set = intel_gpio_set;
-	priv->chip.to_irq = intel_gpio_to_irq;
 	priv->chip.base = gpio_base;
 	priv->chip.ngpio = ddata->ngpio;
 	priv->chip.can_sleep = false;
 	priv->pdev = pdev;
 
 	spin_lock_init(&priv->lock);
-
-	priv->domain = irq_domain_add_simple(pdev->dev.of_node, ddata->ngpio,
-					irq_base, &intel_gpio_irq_ops, priv);
-	if (!priv->domain)
-		return -ENOMEM;
 
 	pci_set_drvdata(pdev, priv);
 	retval = gpiochip_add(&priv->chip);
···
 		return retval;
 	}
 
+	retval = gpiochip_irqchip_add(&priv->chip,
+				      &intel_mid_irqchip,
+				      irq_base,
+				      handle_simple_irq,
+				      IRQ_TYPE_NONE);
+	if (retval) {
+		dev_err(&pdev->dev,
+			"could not connect irqchip to gpiochip\n");
+		return retval;
+	}
+
 	intel_mid_irq_init_hw(priv);
 
-	irq_set_handler_data(pdev->irq, priv);
-	irq_set_chained_handler(pdev->irq, intel_mid_irq_handler);
+	gpiochip_set_chained_irqchip(&priv->chip,
+				     &intel_mid_irqchip,
+				     pdev->irq,
+				     intel_mid_irq_handler);
 
 	pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);

drivers/gpio/gpio-it8761e.c

···
 static void __exit it8761e_gpio_exit(void)
 {
 	if (gpio_ba) {
-		int ret = gpiochip_remove(&it8761e_gpio_chip);
-
-		WARN(ret, "%s(): gpiochip_remove() failed, ret=%d\n",
-				__func__, ret);
-
+		gpiochip_remove(&it8761e_gpio_chip);
 		release_region(gpio_ba, GPIO_IOSIZE);
 		gpio_ba = 0;
 	}

drivers/gpio/gpio-janz-ttl.c

···
 static int ttl_remove(struct platform_device *pdev)
 {
 	struct ttl_module *mod = platform_get_drvdata(pdev);
-	struct device *dev = &pdev->dev;
-	int ret;
 
-	ret = gpiochip_remove(&mod->gpio);
-	if (ret) {
-		dev_err(dev, "unable to remove GPIO chip\n");
-		return ret;
-	}
+	gpiochip_remove(&mod->gpio);
 
 	return 0;
 }

drivers/gpio/gpio-kempld.c

···
 {
 	struct kempld_gpio_data *gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&gpio->chip);
+	gpiochip_remove(&gpio->chip);
+	return 0;
 }
 
 static struct platform_driver kempld_gpio_driver = {

drivers/gpio/gpio-lp3943.c

···
 {
 	struct lp3943_gpio *lp3943_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&lp3943_gpio->chip);
+	gpiochip_remove(&lp3943_gpio->chip);
+	return 0;
 }
 
 static const struct of_device_id lp3943_gpio_of_match[] = {

drivers/gpio/gpio-lpc32xx.c

···
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id lpc32xx_gpio_of_match[] = {
+static const struct of_device_id lpc32xx_gpio_of_match[] = {
 	{ .compatible = "nxp,lpc3220-gpio", },
 	{ },
 };

drivers/gpio/gpio-lynxpoint.c

···
 #include <linux/types.h>
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/gpio.h>
-#include <linux/irqdomain.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <linux/platform_device.h>
···
 
 struct lp_gpio {
 	struct gpio_chip	chip;
-	struct irq_domain	*domain;
 	struct platform_device	*pdev;
 	spinlock_t		lock;
 	unsigned long		reg_base;
···
 
 static int lp_irq_type(struct irq_data *d, unsigned type)
 {
-	struct lp_gpio *lg = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
 	u32 hwirq = irqd_to_hwirq(d);
 	unsigned long flags;
 	u32 value;
···
 	return 0;
 }
 
-static int lp_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
-	return irq_create_mapping(lg->domain, offset);
-}
-
 static void lp_gpio_irq_handler(unsigned hwirq, struct irq_desc *desc)
 {
 	struct irq_data *data = irq_desc_get_irq_data(desc);
-	struct lp_gpio *lg = irq_data_get_irq_handler_data(data);
+	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+	struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
 	u32 base, pin, mask;
 	unsigned long reg, ena, pending;
···
 			mask = BIT(pin);
 			/* Clear before handling so we don't lose an edge */
 			outl(mask, reg);
-			irq = irq_find_mapping(lg->domain, base + pin);
+			irq = irq_find_mapping(lg->chip.irqdomain, base + pin);
 			generic_handle_irq(irq);
 		}
 	}
···
 
 static void lp_irq_enable(struct irq_data *d)
 {
-	struct lp_gpio *lg = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
 	u32 hwirq = irqd_to_hwirq(d);
 	unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
 	unsigned long flags;
···
 
 static void lp_irq_disable(struct irq_data *d)
 {
-	struct lp_gpio *lg = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct lp_gpio *lg = container_of(gc, struct lp_gpio, chip);
 	u32 hwirq = irqd_to_hwirq(d);
 	unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
 	unsigned long flags;
···
 	spin_unlock_irqrestore(&lg->lock, flags);
 }
 
-static int lp_irq_reqres(struct irq_data *d)
-{
-	struct lp_gpio *lg = irq_data_get_irq_chip_data(d);
-
-	if (gpio_lock_as_irq(&lg->chip, irqd_to_hwirq(d))) {
-		dev_err(lg->chip.dev,
-			"unable to lock HW IRQ %lu for IRQ\n",
-			irqd_to_hwirq(d));
-		return -EINVAL;
-	}
-	return 0;
-}
-
-static void lp_irq_relres(struct irq_data *d)
-{
-	struct lp_gpio *lg = irq_data_get_irq_chip_data(d);
-
-	gpio_unlock_as_irq(&lg->chip, irqd_to_hwirq(d));
-}
-
 static struct irq_chip lp_irqchip = {
 	.name = "LP-GPIO",
 	.irq_mask = lp_irq_mask,
···
 	.irq_enable = lp_irq_enable,
 	.irq_disable = lp_irq_disable,
 	.irq_set_type = lp_irq_type,
-	.irq_request_resources = lp_irq_reqres,
-	.irq_release_resources = lp_irq_relres,
 	.flags = IRQCHIP_SKIP_SET_WAKE,
 };
 
···
 	}
 }
 
-static int lp_gpio_irq_map(struct irq_domain *d, unsigned int irq,
-			    irq_hw_number_t hwirq)
-{
-	struct lp_gpio *lg = d->host_data;
-
-	irq_set_chip_and_handler(irq, &lp_irqchip, handle_simple_irq);
-	irq_set_chip_data(irq, lg);
-	irq_set_irq_type(irq, IRQ_TYPE_NONE);
-
-	return 0;
-}
-
-static const struct irq_domain_ops lp_gpio_irq_ops = {
-	.map = lp_gpio_irq_map,
-};
-
 static int lp_gpio_probe(struct platform_device *pdev)
 {
 	struct lp_gpio *lg;
···
 	struct resource *io_rc, *irq_rc;
 	struct device *dev = &pdev->dev;
 	unsigned long reg_len;
-	unsigned hwirq;
 	int ret = -ENODEV;
 
 	lg = devm_kzalloc(dev, sizeof(struct lp_gpio), GFP_KERNEL);
···
 	gc->can_sleep = false;
 	gc->dev = dev;
 
-	/* set up interrupts  */
-	if (irq_rc && irq_rc->start) {
-		hwirq = irq_rc->start;
-		gc->to_irq = lp_gpio_to_irq;
-
-		lg->domain = irq_domain_add_linear(NULL, LP_NUM_GPIO,
-						   &lp_gpio_irq_ops, lg);
-		if (!lg->domain)
-			return -ENXIO;
-
-		lp_gpio_irq_init_hw(lg);
-
-		irq_set_handler_data(hwirq, lg);
-		irq_set_chained_handler(hwirq, lp_gpio_irq_handler);
-	}
-
 	ret = gpiochip_add(gc);
 	if (ret) {
 		dev_err(dev, "failed adding lp-gpio chip\n");
 		return ret;
 	}
+
+	/* set up interrupts  */
+	if (irq_rc && irq_rc->start) {
+		lp_gpio_irq_init_hw(lg);
+		ret = gpiochip_irqchip_add(gc, &lp_irqchip, 0,
+					   handle_simple_irq, IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(dev, "failed to add irqchip\n");
+			gpiochip_remove(gc);
+			return ret;
+		}
+
+		gpiochip_set_chained_irqchip(gc, &lp_irqchip,
+					     (unsigned)irq_rc->start,
+					     lp_gpio_irq_handler);
+	}
+
 	pm_runtime_enable(dev);
 
 	return 0;
···
 static int lp_gpio_remove(struct platform_device *pdev)
 {
 	struct lp_gpio *lg = platform_get_drvdata(pdev);
-	int err;
 	pm_runtime_disable(&pdev->dev);
-	err = gpiochip_remove(&lg->chip);
-	if (err)
-		dev_warn(&pdev->dev, "failed to remove gpio_chip.\n");
+	gpiochip_remove(&lg->chip);
 	return 0;
 }
 

drivers/gpio/gpio-max730x.c

···
 int __max730x_remove(struct device *dev)
 {
 	struct max7301 *ts = dev_get_drvdata(dev);
-	int ret;
 
 	if (ts == NULL)
 		return -ENODEV;
 
 	/* Power down the chip and disable IRQ output */
 	ts->write(dev, 0x04, 0x00);
-
-	ret = gpiochip_remove(&ts->chip);
-	if (!ret)
-		mutex_destroy(&ts->lock);
-	else
-		dev_err(dev, "Failed to remove GPIO controller: %d\n", ret);
-
-	return ret;
+	gpiochip_remove(&ts->chip);
+	mutex_destroy(&ts->lock);
+	kfree(ts);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(__max730x_remove);
 

drivers/gpio/gpio-max732x.c

···
 		}
 	}
 
-	ret = gpiochip_remove(&chip->gpio_chip);
-	if (ret) {
-		dev_err(&client->dev, "%s failed, %d\n",
-				"gpiochip_remove()", ret);
-		return ret;
-	}
+	gpiochip_remove(&chip->gpio_chip);
 
 	max732x_irq_teardown(chip);
 

drivers/gpio/gpio-mc33880.c

···
 static int mc33880_remove(struct spi_device *spi)
 {
 	struct mc33880 *mc;
-	int ret;
 
 	mc = spi_get_drvdata(spi);
 	if (mc == NULL)
 		return -ENODEV;
 
-	ret = gpiochip_remove(&mc->chip);
-	if (!ret)
-		mutex_destroy(&mc->lock);
-	else
-		dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
-			ret);
+	gpiochip_remove(&mc->chip);
+	mutex_destroy(&mc->lock);
 
-	return ret;
+	return 0;
 }
 
 static struct spi_driver mc33880_driver = {

drivers/gpio/gpio-mc9s08dz60.c

···
 
 	mc9s = i2c_get_clientdata(client);
 
-	return gpiochip_remove(&mc9s->chip);
+	gpiochip_remove(&mc9s->chip);
+	return 0;
 }
 
 static const struct i2c_device_id mc9s08dz60_id[] = {

drivers/gpio/gpio-mcp23s08.c

···
 static int mcp230xx_remove(struct i2c_client *client)
 {
 	struct mcp23s08 *mcp = i2c_get_clientdata(client);
-	int status;
 
 	if (client->irq && mcp->irq_controller)
 		mcp23s08_irq_teardown(mcp);
 
-	status = gpiochip_remove(&mcp->chip);
-	if (status == 0)
-		kfree(mcp);
+	gpiochip_remove(&mcp->chip);
+	kfree(mcp);
 
-	return status;
+	return 0;
 }
 
 static const struct i2c_device_id mcp230xx_id[] = {
···
 
 fail:
 	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
-		int tmp;
 
 		if (!data->mcp[addr])
 			continue;
-		tmp = gpiochip_remove(&data->mcp[addr]->chip);
-		if (tmp < 0)
-			dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
+		gpiochip_remove(&data->mcp[addr]->chip);
 	}
 	kfree(data);
 	return status;
···
 {
 	struct mcp23s08_driver_data	*data = spi_get_drvdata(spi);
 	unsigned			addr;
-	int				status = 0;
 
 	for (addr = 0; addr < ARRAY_SIZE(data->mcp); addr++) {
-		int tmp;
 
 		if (!data->mcp[addr])
 			continue;
 
-		tmp = gpiochip_remove(&data->mcp[addr]->chip);
-		if (tmp < 0) {
-			dev_err(&spi->dev, "%s --> %d\n", "remove", tmp);
-			status = tmp;
-		}
+		gpiochip_remove(&data->mcp[addr]->chip);
 	}
-	if (status == 0)
-		kfree(data);
-	return status;
+	kfree(data);
+	return 0;
 }
 
 static const struct spi_device_id mcp23s08_ids[] = {

drivers/gpio/gpio-ml-ioh.c

···
 err_gpiochip_add:
 	while (--i >= 0) {
 		chip--;
-		if (gpiochip_remove(&chip->gpio))
-			dev_err(&pdev->dev, "Failed gpiochip_remove(%d)\n", i);
+		gpiochip_remove(&chip->gpio);
 	}
 	kfree(chip_save);
 
···
 
 static void ioh_gpio_remove(struct pci_dev *pdev)
 {
-	int err;
 	int i;
 	struct ioh_gpio *chip = pci_get_drvdata(pdev);
 	void *chip_save;
···
 
 	for (i = 0; i < 8; i++, chip++) {
 		irq_free_descs(chip->irq_base, num_ports[i]);
-		err = gpiochip_remove(&chip->gpio);
-		if (err)
-			dev_err(&pdev->dev, "Failed gpiochip_remove\n");
+		gpiochip_remove(&chip->gpio);
 	}
 
 	chip = chip_save;

drivers/gpio/gpio-msm-v2.c

···
 
 static int msm_gpio_remove(struct platform_device *dev)
 {
-	int ret = gpiochip_remove(&msm_gpio.gpio_chip);
-
-	if (ret < 0)
-		return ret;
+	gpiochip_remove(&msm_gpio.gpio_chip);
 
 	irq_set_handler(msm_gpio.summary_irq, NULL);
 

drivers/gpio/gpio-mxc.c

···
 out_irqdesc_free:
 	irq_free_descs(irq_base, 32);
 out_gpiochip_remove:
-	WARN_ON(gpiochip_remove(&port->bgc.gc) < 0);
+	gpiochip_remove(&port->bgc.gc);
 out_bgpio_remove:
 	bgpio_remove(&port->bgc);
 out_bgio:

drivers/gpio/gpio-octeon.c

···
 static int octeon_gpio_remove(struct platform_device *pdev)
 {
 	struct gpio_chip *chip = pdev->dev.platform_data;
-	return gpiochip_remove(chip);
+	gpiochip_remove(chip);
+	return 0;
 }
 
 static struct of_device_id octeon_gpio_match[] = {

drivers/gpio/gpio-omap.c

···
 #include <linux/pm.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/irqchip/chained_irq.h>
 #include <linux/gpio.h>
 #include <linux/bitops.h>
 #include <linux/platform_data/gpio-omap.h>
···
 #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
 #define LINE_USED(line, offset) (line & (BIT(offset)))
 
-static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
+static int omap_irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
 {
 	return bank->chip.base + gpio_irq;
 }
 
-static inline struct gpio_bank *_irq_data_get_bank(struct irq_data *d)
+static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 	return container_of(chip, struct gpio_bank, chip);
 }
 
-static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
+static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
+				    int is_input)
 {
 	void __iomem *reg = bank->base;
 	u32 l;
···
 
 
 /* set data out value using dedicate set/clear register */
-static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable)
+static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, int gpio,
+				      int enable)
 {
 	void __iomem *reg = bank->base;
 	u32 l = GPIO_BIT(bank, gpio);
···
 }
 
 /* set data out value using mask register */
-static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable)
+static void omap_set_gpio_dataout_mask(struct gpio_bank *bank, int gpio,
+				       int enable)
 {
 	void __iomem *reg = bank->base + bank->regs->dataout;
 	u32 gpio_bit = GPIO_BIT(bank, gpio);
···
 	bank->context.dataout = l;
 }
 
-static int _get_gpio_datain(struct gpio_bank *bank, int offset)
+static int omap_get_gpio_datain(struct gpio_bank *bank, int offset)
 {
 	void __iomem *reg = bank->base + bank->regs->datain;
 
 	return (readl_relaxed(reg) & (BIT(offset))) != 0;
 }
 
-static int _get_gpio_dataout(struct gpio_bank *bank, int offset)
+static int omap_get_gpio_dataout(struct gpio_bank *bank, int offset)
 {
 	void __iomem *reg = bank->base + bank->regs->dataout;
 
 	return (readl_relaxed(reg) & (BIT(offset))) != 0;
 }
 
-static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
+static inline void omap_gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set)
 {
 	int l = readl_relaxed(base + reg);
 
···
 	writel_relaxed(l, base + reg);
 }
 
-static inline void _gpio_dbck_enable(struct gpio_bank *bank)
+static inline void omap_gpio_dbck_enable(struct gpio_bank *bank)
 {
 	if (bank->dbck_enable_mask && !bank->dbck_enabled) {
 		clk_prepare_enable(bank->dbck);
···
 	}
 }
 
-static inline void _gpio_dbck_disable(struct gpio_bank *bank)
+static inline void omap_gpio_dbck_disable(struct gpio_bank *bank)
 {
 	if (bank->dbck_enable_mask && bank->dbck_enabled) {
 		/*
···
 }
 
 /**
- * _set_gpio_debounce - low level gpio debounce time
+ * omap2_set_gpio_debounce - low level gpio debounce time
  * @bank: the gpio bank we're acting upon
  * @gpio: the gpio number on this @gpio
  * @debounce: debounce time to use
···
  * OMAP's debounce time is in 31us steps so we need
  * to convert and round up to the closest unit.
  */
-static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
-		unsigned debounce)
+static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned gpio,
+				    unsigned debounce)
 {
 	void __iomem		*reg;
 	u32			val;
···
 	 * used within _gpio_dbck_enable() is still not initialized at
 	 * that point. Therefore we have to enable dbck here.
 	 */
-	_gpio_dbck_enable(bank);
+	omap_gpio_dbck_enable(bank);
 	if (bank->dbck_enable_mask) {
 		bank->context.debounce = debounce;
 		bank->context.debounce_en = val;
···
 }
 
 /**
- * _clear_gpio_debounce - clear debounce settings for a gpio
+ * omap_clear_gpio_debounce - clear debounce settings for a gpio
  * @bank: the gpio bank we're acting upon
  * @gpio: the gpio number on this @gpio
  *
···
  * time too. The debounce clock will also be disabled when calling this function
  * if this is the only gpio in the bank using debounce.
  */
-static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
+static void omap_clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio)
 {
 	u32 gpio_bit = GPIO_BIT(bank, gpio);
 
···
 	}
 }
 
-static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio,
+static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
 						unsigned trigger)
 {
 	void __iomem *base = bank->base;
 	u32 gpio_bit = BIT(gpio);
 
-	_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
-		  trigger & IRQ_TYPE_LEVEL_LOW);
-	_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
-		  trigger & IRQ_TYPE_LEVEL_HIGH);
-	_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
-		  trigger & IRQ_TYPE_EDGE_RISING);
-	_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
-		  trigger & IRQ_TYPE_EDGE_FALLING);
+	omap_gpio_rmw(base, bank->regs->leveldetect0, gpio_bit,
+		      trigger & IRQ_TYPE_LEVEL_LOW);
+	omap_gpio_rmw(base, bank->regs->leveldetect1, gpio_bit,
+		      trigger & IRQ_TYPE_LEVEL_HIGH);
+	omap_gpio_rmw(base, bank->regs->risingdetect, gpio_bit,
+		      trigger & IRQ_TYPE_EDGE_RISING);
+	omap_gpio_rmw(base, bank->regs->fallingdetect, gpio_bit,
+		      trigger & IRQ_TYPE_EDGE_FALLING);
 
 	bank->context.leveldetect0 =
 			readl_relaxed(bank->base + bank->regs->leveldetect0);
···
 			readl_relaxed(bank->base + bank->regs->fallingdetect);
 
 	if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
-		_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
+		omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
 		bank->context.wake_en =
 			readl_relaxed(bank->base + bank->regs->wkup_en);
 	}
···
  * This only applies to chips that can't do both rising and falling edge
  * detection at once.  For all other chips, this function is a noop.
  */
-static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
+static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
 {
 	void __iomem *reg = bank->base;
 	u32 l = 0;
···
 	writel_relaxed(l, reg);
 }
 #else
-static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
+static void omap_toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {}
 #endif
 
-static int _set_gpio_triggering(struct gpio_bank *bank, int gpio,
-							unsigned trigger)
+static int omap_set_gpio_triggering(struct gpio_bank *bank, int gpio,
+				    unsigned trigger)
 {
 	void __iomem *reg = bank->base;
 	void __iomem *base = bank->base;
 	u32 l = 0;
 
 	if (bank->regs->leveldetect0 && bank->regs->wkup_en) {
-		set_gpio_trigger(bank, gpio, trigger);
+		omap_set_gpio_trigger(bank, gpio, trigger);
 	} else if (bank->regs->irqctrl) {
 		reg += bank->regs->irqctrl;
 
···
 			l |= BIT(gpio << 1);
 
 		/* Enable wake-up during idle for dynamic tick */
-		_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
+		omap_gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger);
 		bank->context.wake_en =
 			readl_relaxed(bank->base + bank->regs->wkup_en);
 		writel_relaxed(l, reg);
···
 	return 0;
 }
 
-static void _enable_gpio_module(struct gpio_bank *bank, unsigned offset)
+static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
 {
 	if (bank->regs->pinctrl) {
 		void __iomem *reg = bank->base + bank->regs->pinctrl;
···
 	}
 }
 
-static void _disable_gpio_module(struct gpio_bank *bank, unsigned offset)
+static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
 {
 	void __iomem *base = bank->base;
 
···
 	    !LINE_USED(bank->mod_usage, offset) &&
 	    !LINE_USED(bank->irq_usage, offset)) {
 		/* Disable wake-up during idle for dynamic tick */
-		_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
+		omap_gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0);
 		bank->context.wake_en =
 			readl_relaxed(bank->base + bank->regs->wkup_en);
 	}
···
 	}
 }
 
-static int gpio_is_input(struct gpio_bank *bank, int mask)
+static int omap_gpio_is_input(struct gpio_bank *bank, int mask)
 {
 	void __iomem *reg = bank->base + bank->regs->direction;
 
 	return readl_relaxed(reg) & mask;
 }
 
-static int gpio_irq_type(struct irq_data *d, unsigned type)
+static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
 	unsigned gpio = 0;
 	int retval;
 	unsigned long flags;
···
 #endif
 
 	if (!gpio)
-		gpio = irq_to_gpio(bank, d->hwirq);
+		gpio = omap_irq_to_gpio(bank, d->hwirq);
 
 	if (type & ~IRQ_TYPE_SENSE_MASK)
 		return -EINVAL;
···
 
 	spin_lock_irqsave(&bank->lock, flags);
 	offset = GPIO_INDEX(bank, gpio);
-	retval = _set_gpio_triggering(bank, offset, type);
+	retval = omap_set_gpio_triggering(bank, offset, type);
 	if (!LINE_USED(bank->mod_usage, offset)) {
-		_enable_gpio_module(bank, offset);
-		_set_gpio_direction(bank, offset, 1);
-	} else if (!gpio_is_input(bank, BIT(offset))) {
+		omap_enable_gpio_module(bank, offset);
+		omap_set_gpio_direction(bank, offset, 1);
+	} else if (!omap_gpio_is_input(bank, BIT(offset))) {
 		spin_unlock_irqrestore(&bank->lock, flags);
 		return -EINVAL;
 	}
···
 	return retval;
 }
 
-static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
+static void omap_clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 {
 	void __iomem *reg = bank->base;
 
···
 	readl_relaxed(reg);
 }
 
-static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
+static inline void omap_clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
 {
-	_clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
+	omap_clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 }
 
-static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
+static u32 omap_get_gpio_irqbank_mask(struct gpio_bank *bank)
 {
 	void __iomem *reg = bank->base;
 	u32 l;
···
 	return l;
 }
 
-static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
+static void omap_enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 {
 	void __iomem *reg = bank->base;
 	u32 l;
···
 	writel_relaxed(l, reg);
 }
 
-static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
+static void omap_disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 {
 	void __iomem *reg = bank->base;
 	u32 l;
···
 	writel_relaxed(l, reg);
 }
 
-static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
+static inline void omap_set_gpio_irqenable(struct gpio_bank *bank, int gpio,
+					   int enable)
 {
 	if (enable)
-		_enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
+		omap_enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 	else
-		_disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
+		omap_disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio));
 }
 
 /*
···
  * enabled. When system is suspended, only selected GPIO interrupts need
  * to have wake-up enabled.
  */
-static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
+static int omap_set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 {
 	u32 gpio_bit = GPIO_BIT(bank, gpio);
 	unsigned long flags;
···
 	return 0;
 }
 
-static void _reset_gpio(struct gpio_bank *bank, int gpio)
+static void omap_reset_gpio(struct gpio_bank *bank, int gpio)
 {
-	_set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
-	_set_gpio_irqenable(bank, gpio, 0);
-	_clear_gpio_irqstatus(bank, gpio);
-	_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
-	_clear_gpio_debounce(bank, gpio);
+	omap_set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1);
+	omap_set_gpio_irqenable(bank, gpio, 0);
+	omap_clear_gpio_irqstatus(bank, gpio);
+	omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
+	omap_clear_gpio_debounce(bank, gpio);
 }
 
 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
-static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
+static int omap_gpio_wake_enable(struct irq_data *d, unsigned int enable)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
-	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
+	unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 
-	return _set_gpio_wakeup(bank, gpio, enable);
+	return omap_set_gpio_wakeup(bank, gpio, enable);
 }
 
 static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
···
 	 * not already been requested.
 	 */
 	if (!LINE_USED(bank->irq_usage, offset)) {
-		_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
-		_enable_gpio_module(bank, offset);
+		omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
+		omap_enable_gpio_module(bank, offset);
 	}
 	bank->mod_usage |= BIT(offset);
 	spin_unlock_irqrestore(&bank->lock, flags);
···
 
 	spin_lock_irqsave(&bank->lock, flags);
 	bank->mod_usage &= ~(BIT(offset));
-	_disable_gpio_module(bank, offset);
-	_reset_gpio(bank, bank->chip.base + offset);
+	omap_disable_gpio_module(bank, offset);
+	omap_reset_gpio(bank, bank->chip.base + offset);
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	/*
···
  * line's interrupt handler has been run, we may miss some nested
  * interrupts.
  */
-static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+static void omap_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
 {
 	void __iomem *isr_reg = NULL;
 	u32 isr;
···
 		u32 isr_saved, level_mask = 0;
 		u32 enabled;
 
-		enabled = _get_gpio_irqbank_mask(bank);
+		enabled = omap_get_gpio_irqbank_mask(bank);
 		isr_saved = isr = readl_relaxed(isr_reg) & enabled;
 
 		if (bank->level_mask)
···
 		/* clear edge sensitive interrupts before handler(s) are
 		called so that we don't miss any interrupt occurred while
 		executing them */
-		_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
-		_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
-		_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
+		omap_disable_gpio_irqbank(bank, isr_saved & ~level_mask);
+		omap_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
+		omap_enable_gpio_irqbank(bank, isr_saved & ~level_mask);
 
 		/* if there is only edge sensitive GPIO pin interrupts
 		configured, we could unmask GPIO bank interrupt immediately */
···
 			 * This will be indicated in the bank toggle_mask.
 			 */
 			if (bank->toggle_mask & (BIT(bit)))
-				_toggle_gpio_edge_triggering(bank, bit);
+				omap_toggle_gpio_edge_triggering(bank, bit);
 
 			generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
 							    bit));
···
 	pm_runtime_put(bank->dev);
 }
 
-static void gpio_irq_shutdown(struct irq_data *d)
+static void omap_gpio_irq_shutdown(struct irq_data *d)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
-	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
+	unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 	unsigned long flags;
 	unsigned offset = GPIO_INDEX(bank, gpio);
 
 	spin_lock_irqsave(&bank->lock, flags);
 	gpio_unlock_as_irq(&bank->chip, offset);
 	bank->irq_usage &= ~(BIT(offset));
-	_disable_gpio_module(bank, offset);
-	_reset_gpio(bank, gpio);
+	omap_disable_gpio_module(bank, offset);
+	omap_reset_gpio(bank, gpio);
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	/*
···
 		pm_runtime_put(bank->dev);
 }
 
-static void gpio_ack_irq(struct irq_data *d)
+static void omap_gpio_ack_irq(struct irq_data *d)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
-	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
+	unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 
-	_clear_gpio_irqstatus(bank, gpio);
+	omap_clear_gpio_irqstatus(bank, gpio);
 }
 
-static void gpio_mask_irq(struct irq_data *d)
+static void omap_gpio_mask_irq(struct irq_data *d)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
-	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
+	unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 	unsigned long flags;
 
 	spin_lock_irqsave(&bank->lock, flags);
-	_set_gpio_irqenable(bank, gpio, 0);
-	_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
+	omap_set_gpio_irqenable(bank, gpio, 0);
+	omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
 	spin_unlock_irqrestore(&bank->lock, flags);
 }
 
-static void gpio_unmask_irq(struct irq_data *d)
+static void omap_gpio_unmask_irq(struct irq_data *d)
 {
-	struct gpio_bank *bank = _irq_data_get_bank(d);
-	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+	struct gpio_bank *bank = omap_irq_data_get_bank(d);
+	unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq);
 	unsigned int irq_mask = GPIO_BIT(bank, gpio);
 	u32 trigger = irqd_get_trigger_type(d);
 	unsigned long flags;
 
 	spin_lock_irqsave(&bank->lock, flags);
 	if (trigger)
-		_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
+		omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
 
 	/* For level-triggered GPIOs, the clearing must be done after
 	 * the HW source is cleared, thus after the handler has run */
 	if (bank->level_mask & irq_mask) {
-		_set_gpio_irqenable(bank, gpio, 0);
-		_clear_gpio_irqstatus(bank, gpio);
+		omap_set_gpio_irqenable(bank, gpio, 0);
+		omap_clear_gpio_irqstatus(bank, gpio);
 	}
 
-	_set_gpio_irqenable(bank, gpio, 1);
+	omap_set_gpio_irqenable(bank, gpio, 1);
 	spin_unlock_irqrestore(&bank->lock, flags);
 }
 
 static struct irq_chip gpio_irq_chip = {
 	.name		= "GPIO",
-	.irq_shutdown	= gpio_irq_shutdown,
-	.irq_ack	= gpio_ack_irq,
-	.irq_mask	= gpio_mask_irq,
-	.irq_unmask	= gpio_unmask_irq,
-	.irq_set_type	= gpio_irq_type,
-	.irq_set_wake	= gpio_wake_enable,
+	.irq_shutdown	= omap_gpio_irq_shutdown,
+	.irq_ack	= omap_gpio_ack_irq,
+	.irq_mask	= omap_gpio_mask_irq,
+	.irq_unmask	= omap_gpio_unmask_irq,
+	.irq_set_type	= omap_gpio_irq_type,
+	.irq_set_wake	= omap_gpio_wake_enable,
 };
 
 /*---------------------------------------------------------------------*/
···
 	/* could list the /proc/iomem resources */
 };
 
-static inline void mpuio_init(struct gpio_bank *bank)
+static inline void omap_mpuio_init(struct gpio_bank *bank)
 {
 	platform_set_drvdata(&omap_mpuio_device, bank);
 
···
 
 /*---------------------------------------------------------------------*/
 
-static int gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+static int omap_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 {
 	struct gpio_bank *bank;
 	unsigned long flags;
···
 	return dir;
 }
 
-static int gpio_input(struct gpio_chip *chip, unsigned offset)
+static int omap_gpio_input(struct gpio_chip *chip, unsigned offset)
 {
 	struct gpio_bank *bank;
 	unsigned long flags;
 
 	bank = container_of(chip, struct gpio_bank, chip);
 	spin_lock_irqsave(&bank->lock, flags);
-	_set_gpio_direction(bank, offset, 1);
+	omap_set_gpio_direction(bank, offset, 1);
 	spin_unlock_irqrestore(&bank->lock, flags);
 	return 0;
 }
 
-static int gpio_get(struct gpio_chip *chip, unsigned offset)
+static int omap_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct gpio_bank *bank;
 	u32 mask;
···
 	bank = container_of(chip, struct gpio_bank, chip);
 	mask = (BIT(offset));
 
-	if (gpio_is_input(bank, mask))
-		return _get_gpio_datain(bank, offset);
+	if (omap_gpio_is_input(bank, mask))
+		return omap_get_gpio_datain(bank, offset);
 	else
-		return _get_gpio_dataout(bank, offset);
+		return omap_get_gpio_dataout(bank, offset);
 }
 
-static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
+static int omap_gpio_output(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct gpio_bank *bank;
 	unsigned long flags;
···
 	bank = container_of(chip, struct gpio_bank, chip);
 	spin_lock_irqsave(&bank->lock, flags);
 	bank->set_dataout(bank, offset, value);
-	_set_gpio_direction(bank, offset, 0);
+	omap_set_gpio_direction(bank, offset, 0);
 	spin_unlock_irqrestore(&bank->lock, flags);
 	return 0;
 }
 
-static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
-		unsigned debounce)
+static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset,
+			      unsigned debounce)
 {
 	struct gpio_bank *bank;
 	unsigned long flags;
···
 	bank = container_of(chip, struct gpio_bank, chip);
 
 	spin_lock_irqsave(&bank->lock, flags);
-	_set_gpio_debounce(bank, offset, debounce);
+	omap2_set_gpio_debounce(bank, offset, debounce);
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	return 0;
 }
 
-static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	struct gpio_bank *bank;
 	unsigned long flags;
···
 	called = true;
 }
 
-/* This lock class tells lockdep that GPIO irqs are in a different
- * category than their parents, so it won't report false recursion.
- */
-static struct lock_class_key gpio_lock_class;
-
 static void omap_gpio_mod_init(struct gpio_bank *bank)
 {
 	void __iomem *base = bank->base;
···
 		return;
 	}
 
-	_gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv);
-	_gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv);
+	omap_gpio_rmw(base, bank->regs->irqenable, l,
+		      bank->regs->irqenable_inv);
+	omap_gpio_rmw(base, bank->regs->irqstatus, l,
+		      !bank->regs->irqenable_inv);
 	if (bank->regs->debounce_en)
 		writel_relaxed(0, base + bank->regs->debounce_en);
 
···
 	/* NOTE: No ack required, reading IRQ status clears it. */
 	ct->chip.irq_mask = irq_gc_mask_set_bit;
 	ct->chip.irq_unmask = irq_gc_mask_clr_bit;
-	ct->chip.irq_set_type = gpio_irq_type;
+	ct->chip.irq_set_type = omap_gpio_irq_type;
 
 	if (bank->regs->wkup_en)
-		ct->chip.irq_set_wake = gpio_wake_enable;
+		ct->chip.irq_set_wake = omap_gpio_wake_enable;
 
 	ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride;
 	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
···
 	 */
 	bank->chip.request = omap_gpio_request;
 	bank->chip.free = omap_gpio_free;
-	bank->chip.get_direction = gpio_get_direction;
-	bank->chip.direction_input = gpio_input;
-	bank->chip.get = gpio_get;
-	bank->chip.direction_output = gpio_output;
-	bank->chip.set_debounce = gpio_debounce;
-	bank->chip.set = gpio_set;
+	bank->chip.get_direction = omap_gpio_get_direction;
+	bank->chip.direction_input = omap_gpio_input;
+	bank->chip.get = omap_gpio_get;
+	bank->chip.direction_output = omap_gpio_output;
+	bank->chip.set_debounce = omap_gpio_debounce;
+	bank->chip.set = omap_gpio_set;
 	if (bank->is_mpuio) {
 		bank->chip.label = "mpuio";
 		if (bank->regs->wkup_en)
···
 #endif
 
 	ret = gpiochip_irqchip_add(&bank->chip, &gpio_irq_chip,
-				   irq_base, gpio_irq_handler,
+				   irq_base, omap_gpio_irq_handler,
 				   IRQ_TYPE_NONE);
 
 	if (ret) {
···
 	}
 
 	gpiochip_set_chained_irqchip(&bank->chip, &gpio_irq_chip,
-				     bank->irq, gpio_irq_handler);
+				     bank->irq, omap_gpio_irq_handler);
 
 	for (j = 0; j < bank->width; j++) {
 		int irq = irq_find_mapping(bank->chip.irqdomain, j);
-		irq_set_lockdep_class(irq, &gpio_lock_class);
 		if (bank->is_mpuio) {
 			omap_mpuio_alloc_gc(bank, irq, bank->width);
 			irq_set_chip_and_handler(irq, NULL, NULL);
···
 	}
 
 	if (bank->regs->set_dataout && bank->regs->clr_dataout)
-		bank->set_dataout = _set_gpio_dataout_reg;
+		bank->set_dataout = omap_set_gpio_dataout_reg;
 	else
-		bank->set_dataout = _set_gpio_dataout_mask;
+		bank->set_dataout = omap_set_gpio_dataout_mask;
 
 	spin_lock_init(&bank->lock);
 
···
 	pm_runtime_get_sync(bank->dev);
 
 	if (bank->is_mpuio)
-		mpuio_init(bank);
+		omap_mpuio_init(bank);
 
 	omap_gpio_mod_init(bank);
 
···
 		bank->context_loss_count =
 				bank->get_context_loss_count(bank->dev);
 
-	_gpio_dbck_disable(bank);
+	omap_gpio_dbck_disable(bank);
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	return 0;
···
 				bank->get_context_loss_count(bank->dev);
 	}
 
-	_gpio_dbck_enable(bank);
+	omap_gpio_dbck_enable(bank);
 
 	/*
 	 * In ->runtime_suspend(), level-triggered, wakeup-enabled

drivers/gpio/gpio-palmas.c

···
 {
 	struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&palmas_gpio->gpio_chip);
+	gpiochip_remove(&palmas_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver palmas_gpio_driver = {

drivers/gpio/gpio-pca953x.c

···
 		}
 	}
 
-	ret = gpiochip_remove(&chip->gpio_chip);
-	if (ret) {
-		dev_err(&client->dev, "%s failed, %d\n",
-				"gpiochip_remove()", ret);
-		return ret;
-	}
+	gpiochip_remove(&chip->gpio_chip);
 
 	return 0;
 }

drivers/gpio/gpio-pcf857x.c

···
 	if (client->irq)
 		pcf857x_irq_domain_cleanup(gpio);
 
-	status = gpiochip_remove(&gpio->chip);
-	if (status)
-		dev_err(&client->dev, "%s --> %d\n", "remove", status);
+	gpiochip_remove(&gpio->chip);
 	return status;
 }
 

drivers/gpio/gpio-pch.c

···
 
 err_request_irq:
 	irq_free_descs(irq_base, gpio_pins[chip->ioh]);
-
-	if (gpiochip_remove(&chip->gpio))
-		dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
+	gpiochip_remove(&chip->gpio);
 
 err_gpiochip_add:
 	pci_iounmap(pdev, chip->base);
···
 
 static void pch_gpio_remove(struct pci_dev *pdev)
 {
-	int err;
 	struct pch_gpio *chip = pci_get_drvdata(pdev);
 
 	if (chip->irq_base != -1) {
···
 		irq_free_descs(chip->irq_base, gpio_pins[chip->ioh]);
 	}
 
-	err = gpiochip_remove(&chip->gpio);
-	if (err)
-		dev_err(&pdev->dev, "Failed gpiochip_remove\n");
-
+	gpiochip_remove(&chip->gpio);
 	pci_iounmap(pdev, chip->base);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);

drivers/gpio/gpio-pxa.c

···
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id pxa_gpio_dt_ids[] = {
+static const struct of_device_id pxa_gpio_dt_ids[] = {
 	{ .compatible = "intel,pxa25x-gpio",	.data = &pxa25x_id, },
 	{ .compatible = "intel,pxa26x-gpio",	.data = &pxa26x_id, },
 	{ .compatible = "intel,pxa27x-gpio",	.data = &pxa27x_id, },
···
 						 handle_edge_irq);
 			set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 		}
+	} else {
+		if (irq0 > 0)
+			irq_set_chained_handler(irq0, pxa_gpio_demux_handler);
+		if (irq1 > 0)
+			irq_set_chained_handler(irq1, pxa_gpio_demux_handler);
 	}
 
 	irq_set_chained_handler(irq_mux, pxa_gpio_demux_handler);

drivers/gpio/gpio-rc5t583.c

···
 {
 	struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&rc5t583_gpio->gpio_chip);
+	gpiochip_remove(&rc5t583_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver rc5t583_gpio_driver = {

drivers/gpio/gpio-rcar.c

···
 	/* testing on r8a7790 shows that INDT does not show correct pin state
 	 * when configured as output, so use OUTDT in case of output pins */
 	if (gpio_rcar_read(gpio_to_priv(chip), INOUTSEL) & bit)
-		return (int)(gpio_rcar_read(gpio_to_priv(chip), OUTDT) & bit);
+		return !!(gpio_rcar_read(gpio_to_priv(chip), OUTDT) & bit);
 	else
-		return (int)(gpio_rcar_read(gpio_to_priv(chip), INDT) & bit);
+		return !!(gpio_rcar_read(gpio_to_priv(chip), INDT) & bit);
 }
 
 static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
···
 static int gpio_rcar_remove(struct platform_device *pdev)
 {
 	struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
-	int ret;
 
-	ret = gpiochip_remove(&p->gpio_chip);
-	if (ret)
-		return ret;
+	gpiochip_remove(&p->gpio_chip);
 
 	irq_domain_remove(p->irq_domain);
 	pm_runtime_put(&pdev->dev);

drivers/gpio/gpio-rdc321x.c

···
 
 static int rdc321x_gpio_remove(struct platform_device *pdev)
 {
-	int ret;
 	struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev);
 
-	ret = gpiochip_remove(&rdc321x_gpio_dev->chip);
-	if (ret)
-		dev_err(&pdev->dev, "failed to unregister chip\n");
+	gpiochip_remove(&rdc321x_gpio_dev->chip);
 
-	return ret;
+	return 0;
 }
 
 static struct platform_driver rdc321x_gpio_driver = {

drivers/gpio/gpio-sch.c

···
 	return 0;
 
 err_sch_gpio_resume:
-	if (gpiochip_remove(&sch_gpio_core))
-		dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
+	gpiochip_remove(&sch_gpio_core);
 
 err_sch_gpio_core:
 	release_region(res->start, resource_size(res));
···
 {
 	struct resource *res;
 	if (gpio_ba) {
-		int err;
 
-		err  = gpiochip_remove(&sch_gpio_core);
-		if (err)
-			dev_err(&pdev->dev, "%s failed, %d\n",
-				"gpiochip_remove()", err);
-		err = gpiochip_remove(&sch_gpio_resume);
-		if (err)
-			dev_err(&pdev->dev, "%s failed, %d\n",
-				"gpiochip_remove()", err);
+		gpiochip_remove(&sch_gpio_core);
+		gpiochip_remove(&sch_gpio_resume);
 
 		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 
 		release_region(res->start, resource_size(res));
 		gpio_ba = 0;
-
-		return err;
 	}
 
 	return 0;

drivers/gpio/gpio-sch311x.c

···
 {
 	struct sch311x_pdev_data *pdata = pdev->dev.platform_data;
 	struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev);
-	int err, i;
+	int i;
 
 	release_region(pdata->runtime_reg + GP1, 6);
 
 	for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) {
-		err = gpiochip_remove(&priv->blocks[i].chip);
-		if (err)
-			return err;
+		gpiochip_remove(&priv->blocks[i].chip);
 		dev_info(&pdev->dev,
 			 "SMSC SCH311x GPIO block %d unregistered.\n", i);
 	}

drivers/gpio/gpio-sodaville.c

···
 	free_irq(pdev->irq, sd);
 	irq_free_descs(sd->irq_base, SDV_NUM_PUB_GPIOS);
 
-	if (gpiochip_remove(&sd->bgpio.gc))
-		dev_err(&pdev->dev, "gpiochip_remove() failed.\n");
-
+	gpiochip_remove(&sd->bgpio.gc);
 	pci_release_region(pdev, GPIO_BAR);
 	iounmap(sd->gpio_pub_base);
 	pci_disable_device(pdev);

drivers/gpio/gpio-stmpe.c

···
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
 #include <linux/mfd/stmpe.h>
···
 	struct stmpe *stmpe;
 	struct device *dev;
 	struct mutex irq_lock;
-	struct irq_domain *domain;
 	unsigned norequest_mask;
-
 	/* Caches of interrupt control registers for bus_lock */
 	u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
 	u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
···
 	return stmpe_set_bits(stmpe, reg, mask, 0);
 }
 
-static int stmpe_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
-	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
-
-	return irq_create_mapping(stmpe_gpio->domain, offset);
-}
-
 static int stmpe_gpio_request(struct gpio_chip *chip, unsigned offset)
 {
 	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
···
 	.get			= stmpe_gpio_get,
 	.direction_output	= stmpe_gpio_direction_output,
 	.set			= stmpe_gpio_set,
-	.to_irq			= stmpe_gpio_to_irq,
 	.request		= stmpe_gpio_request,
 	.can_sleep		= true,
 };
 
 static int stmpe_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
-	struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
···
 
 static void stmpe_gpio_irq_lock(struct irq_data *d)
 {
-	struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(gc);
 
 	mutex_lock(&stmpe_gpio->irq_lock);
 }
 
 static void stmpe_gpio_irq_sync_unlock(struct irq_data *d)
 {
-	struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(gc);
 	struct stmpe *stmpe = stmpe_gpio->stmpe;
 	int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
 	static const u8 regmap[] = {
···
 
 static void stmpe_gpio_irq_mask(struct irq_data *d)
 {
-	struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
···
 
 static void stmpe_gpio_irq_unmask(struct irq_data *d)
 {
-	struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(gc);
 	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
···
 		while (stat) {
 			int bit = __ffs(stat);
 			int line = bank * 8 + bit;
-			int child_irq = irq_find_mapping(stmpe_gpio->domain,
+			int child_irq = irq_find_mapping(stmpe_gpio->chip.irqdomain,
 							 line);
 
 			handle_nested_irq(child_irq);
···
 	}
 
 	return IRQ_HANDLED;
-}
-
-static int stmpe_gpio_irq_map(struct irq_domain *d, unsigned int irq,
-			      irq_hw_number_t hwirq)
-{
-	struct stmpe_gpio *stmpe_gpio = d->host_data;
-
-	if (!stmpe_gpio)
-		return -EINVAL;
-
-	irq_set_chip_data(irq, stmpe_gpio);
-	irq_set_chip_and_handler(irq, &stmpe_gpio_irq_chip,
-				 handle_simple_irq);
-	irq_set_nested_thread(irq, 1);
-#ifdef CONFIG_ARM
-	set_irq_flags(irq, IRQF_VALID);
-#else
-	irq_set_noprobe(irq);
-#endif
-
-	return 0;
-}
-
-static void stmpe_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
-{
-#ifdef CONFIG_ARM
-	set_irq_flags(irq, 0);
-#endif
-	irq_set_chip_and_handler(irq, NULL, NULL);
-	irq_set_chip_data(irq, NULL);
-}
-
-static const struct irq_domain_ops stmpe_gpio_irq_simple_ops = {
-	.unmap = stmpe_gpio_irq_unmap,
-	.map = stmpe_gpio_irq_map,
-	.xlate = irq_domain_xlate_twocell,
-};
-
-static int stmpe_gpio_irq_init(struct stmpe_gpio *stmpe_gpio,
-		struct device_node *np)
-{
-	stmpe_gpio->domain = irq_domain_add_simple(np,
-				stmpe_gpio->chip.ngpio, 0,
-				&stmpe_gpio_irq_simple_ops, stmpe_gpio);
-	if (!stmpe_gpio->domain) {
-		dev_err(stmpe_gpio->dev, "failed to create irqdomain\n");
-		return -ENOSYS;
-	}
-
-	return 0;
 }
 
 static int stmpe_gpio_probe(struct platform_device *pdev)
···
 
 	if (irq < 0)
 		dev_info(&pdev->dev,
-			"device configured in no-irq mode; "
+			"device configured in no-irq mode: "
 			"irqs are not available\n");
 
 	ret = stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
 	if (ret)
 		goto out_free;
 
-	if (irq >= 0) {
-		ret = stmpe_gpio_irq_init(stmpe_gpio, np);
-		if (ret)
-			goto out_disable;
-
-		ret = request_threaded_irq(irq, NULL, stmpe_gpio_irq,
-				IRQF_ONESHOT, "stmpe-gpio", stmpe_gpio);
+	if (irq > 0) {
+		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+				stmpe_gpio_irq, IRQF_ONESHOT,
+				"stmpe-gpio", stmpe_gpio);
 		if (ret) {
 			dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
 			goto out_disable;
+		}
+		ret =  gpiochip_irqchip_add(&stmpe_gpio->chip,
+					    &stmpe_gpio_irq_chip,
+					    0,
+					    handle_simple_irq,
+					    IRQ_TYPE_NONE);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"could not connect irqchip to gpiochip\n");
+			return ret;
 		}
 	}
 
 	ret = gpiochip_add(&stmpe_gpio->chip);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
-		goto out_freeirq;
+		goto out_disable;
 	}
 
 	if (pdata && pdata->setup)
···
 
 	return 0;
 
-out_freeirq:
-	if (irq >= 0)
-		free_irq(irq, stmpe_gpio);
 out_disable:
 	stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
 out_free:
···
 	struct stmpe_gpio *stmpe_gpio = platform_get_drvdata(pdev);
 	struct stmpe *stmpe = stmpe_gpio->stmpe;
 	struct stmpe_gpio_platform_data *pdata = stmpe->pdata->gpio;
-	int irq = platform_get_irq(pdev, 0);
-	int ret;
 
 	if (pdata && pdata->remove)
 		pdata->remove(stmpe, stmpe_gpio->chip.base);
 
-	ret = gpiochip_remove(&stmpe_gpio->chip);
-	if (ret < 0) {
-		dev_err(stmpe_gpio->dev,
-			"unable to remove gpiochip: %d\n", ret);
-		return ret;
-	}
+	gpiochip_remove(&stmpe_gpio->chip);
 
 	stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
-
-	if (irq >= 0)
-		free_irq(irq, stmpe_gpio);
 
 	kfree(stmpe_gpio);
 

drivers/gpio/gpio-sx150x.c

···
 
 	return 0;
 probe_fail_post_gpiochip_add:
-	WARN_ON(gpiochip_remove(&chip->gpio_chip) < 0);
+	gpiochip_remove(&chip->gpio_chip);
 	return rc;
 }
 
 static int sx150x_remove(struct i2c_client *client)
 {
 	struct sx150x_chip *chip;
-	int rc;
 
 	chip = i2c_get_clientdata(client);
-	rc = gpiochip_remove(&chip->gpio_chip);
-	if (rc < 0)
-		return rc;
+	gpiochip_remove(&chip->gpio_chip);
 
 	if (chip->irq_summary >= 0)
 		sx150x_remove_irq_chip(chip);

drivers/gpio/gpio-syscon.c

···
 {
 	struct syscon_gpio_priv *priv = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&priv->chip);
+	gpiochip_remove(&priv->chip);
+	return 0;
 }
 
 static struct platform_driver syscon_gpio_driver = {

drivers/gpio/gpio-tb10x.c

···
 static int __exit tb10x_gpio_remove(struct platform_device *pdev)
 {
 	struct tb10x_gpio *tb10x_gpio = platform_get_drvdata(pdev);
-	int ret;
 
 	if (tb10x_gpio->gc.to_irq) {
 		irq_remove_generic_chip(tb10x_gpio->domain->gc->gc[0],
···
 		irq_domain_remove(tb10x_gpio->domain);
 		free_irq(tb10x_gpio->irq, tb10x_gpio);
 	}
-	ret = gpiochip_remove(&tb10x_gpio->gc);
-	if (ret)
-		return ret;
+	gpiochip_remove(&tb10x_gpio->gc);
 
 	return 0;
 }

drivers/gpio/gpio-tc3589x.c

···
 	struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
 	struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
 	struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
-	int ret;
 
 	if (pdata && pdata->remove)
 		pdata->remove(tc3589x, tc3589x_gpio->chip.base);
 
-	ret = gpiochip_remove(&tc3589x_gpio->chip);
-	if (ret < 0) {
-		dev_err(tc3589x_gpio->dev,
-			"unable to remove gpiochip: %d\n", ret);
-		return ret;
-	}
+	gpiochip_remove(&tc3589x_gpio->chip);
 
 	return 0;
 }

drivers/gpio/gpio-timberdale.c

···
 
 static int timbgpio_remove(struct platform_device *pdev)
 {
-	int err;
 	struct timbgpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
 	struct timbgpio *tgpio = platform_get_drvdata(pdev);
 	int irq = platform_get_irq(pdev, 0);
···
 		irq_set_handler_data(irq, NULL);
 	}
 
-	err = gpiochip_remove(&tgpio->gpio);
-	if (err)
-		printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");
+	gpiochip_remove(&tgpio->gpio);
 
 	return 0;
 }

drivers/gpio/gpio-tps6586x.c

···
 {
 	struct tps6586x_gpio *tps6586x_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&tps6586x_gpio->gpio_chip);
+	gpiochip_remove(&tps6586x_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver tps6586x_gpio_driver = {

drivers/gpio/gpio-tps65910.c

···
 {
 	struct tps65910_gpio *tps65910_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&tps65910_gpio->gpio_chip);
+	gpiochip_remove(&tps65910_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver tps65910_gpio_driver = {

drivers/gpio/gpio-tps65912.c

···
 {
 	struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&tps65912_gpio->gpio_chip);
+	gpiochip_remove(&tps65912_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver tps65912_gpio_driver = {

drivers/gpio/gpio-ts5500.c

···
 
 	return 0;
 cleanup:
-	if (gpiochip_remove(&priv->gpio_chip))
-		dev_err(dev, "failed to remove gpio chip\n");
+	gpiochip_remove(&priv->gpio_chip);
 	return ret;
 }
 
···
 	struct ts5500_priv *priv = platform_get_drvdata(pdev);
 
 	ts5500_disable_irq(priv);
-	return gpiochip_remove(&priv->gpio_chip);
+	gpiochip_remove(&priv->gpio_chip);
+	return 0;
 }
 
 static struct platform_device_id ts5500_dio_ids[] = {

drivers/gpio/gpio-twl4030.c

···
 
 	platform_set_drvdata(pdev, priv);
 
-	if (pdata && pdata->setup) {
+	if (pdata->setup) {
 		int status;
 
 		status = pdata->setup(&pdev->dev, priv->gpio_chip.base,
···
 		}
 	}
 
-	status = gpiochip_remove(&priv->gpio_chip);
-	if (status < 0)
-		return status;
+	gpiochip_remove(&priv->gpio_chip);
 
 	if (is_module())
 		return 0;

drivers/gpio/gpio-twl6040.c

···
 
 static int gpo_twl6040_remove(struct platform_device *pdev)
 {
-	return gpiochip_remove(&twl6040gpo_chip);
+	gpiochip_remove(&twl6040gpo_chip);
+	return 0;
 }
 
 /* Note:  this hardware lives inside an I2C-based multi-function device. */

drivers/gpio/gpio-ucb1400.c

···
 	if (err)
 		goto err;
 
-	if (ucb && ucb->gpio_setup)
+	if (ucb->gpio_setup)
 		err = ucb->gpio_setup(&dev->dev, ucb->gc.ngpio);
 
 err:
···
 			return err;
 	}
 
-	err = gpiochip_remove(&ucb->gc);
+	gpiochip_remove(&ucb->gc);
 	return err;
 }
 

drivers/gpio/gpio-viperboard.c

···
 	return ret;
 
 err_gpiob:
-	if (gpiochip_remove(&vb_gpio->gpioa))
-		dev_err(&pdev->dev, "%s gpiochip_remove failed\n", __func__);
+	gpiochip_remove(&vb_gpio->gpioa);
 
 err_gpioa:
 	return ret;
···
 static int vprbrd_gpio_remove(struct platform_device *pdev)
 {
 	struct vprbrd_gpio *vb_gpio = platform_get_drvdata(pdev);
-	int ret;
 
-	ret = gpiochip_remove(&vb_gpio->gpiob);
-	if (ret == 0)
-		ret = gpiochip_remove(&vb_gpio->gpioa);
+	gpiochip_remove(&vb_gpio->gpiob);
 
-	return ret;
+	return 0;
 }
 
 static struct platform_driver vprbrd_gpio_driver = {

drivers/gpio/gpio-vr41xx.c

···
 	struct resource *res;
 	unsigned int trigger, i, pin;
 	struct irq_chip *chip;
-	int irq, retval;
+	int irq, ret;
 
 	switch (pdev->id) {
 	case GPIO_50PINS_PULLUPDOWN:
···
 
 	vr41xx_gpio_chip.dev = &pdev->dev;
 
-	retval = gpiochip_add(&vr41xx_gpio_chip);
+	ret = gpiochip_add(&vr41xx_gpio_chip);
+	if (!ret) {
+		iounmap(giu_base);
+		return -ENODEV;
+	}
 
 	giu_write(GIUINTENL, 0);
 	giu_write(GIUINTENH, 0);

drivers/gpio/gpio-vx855.c

···
 	struct vx855_gpio *vg = platform_get_drvdata(pdev);
 	struct resource *res;
 
-	if (gpiochip_remove(&vg->gpio))
-		dev_err(&pdev->dev, "unable to remove gpio_chip?\n");
+	gpiochip_remove(&vg->gpio);
 
 	if (vg->gpi_reserved) {
 		res = platform_get_resource(pdev, IORESOURCE_IO, 0);

drivers/gpio/gpio-wm831x.c

···
 {
 	struct wm831x_gpio *wm831x_gpio = platform_get_drvdata(pdev);
 
-	return  gpiochip_remove(&wm831x_gpio->gpio_chip);
+	gpiochip_remove(&wm831x_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver wm831x_gpio_driver = {

drivers/gpio/gpio-wm8350.c

···
 {
 	struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&wm8350_gpio->gpio_chip);
+	gpiochip_remove(&wm8350_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver wm8350_gpio_driver = {

drivers/gpio/gpio-wm8994.c

···
 {
 	struct wm8994_gpio *wm8994_gpio = platform_get_drvdata(pdev);
 
-	return gpiochip_remove(&wm8994_gpio->gpio_chip);
+	gpiochip_remove(&wm8994_gpio->gpio_chip);
+	return 0;
 }
 
 static struct platform_driver wm8994_gpio_driver = {

drivers/gpio/gpio-zynq.c

···
+/*
+ * Xilinx Zynq GPIO device driver
+ *
+ * Copyright (C) 2009 - 2014 Xilinx, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define DRIVER_NAME "zynq-gpio"
+
+/* Maximum banks */
+#define ZYNQ_GPIO_MAX_BANK	4
+
+#define ZYNQ_GPIO_BANK0_NGPIO	32
+#define ZYNQ_GPIO_BANK1_NGPIO	22
+#define ZYNQ_GPIO_BANK2_NGPIO	32
+#define ZYNQ_GPIO_BANK3_NGPIO	32
+
+#define ZYNQ_GPIO_NR_GPIOS	(ZYNQ_GPIO_BANK0_NGPIO + \
+				 ZYNQ_GPIO_BANK1_NGPIO + \
+				 ZYNQ_GPIO_BANK2_NGPIO + \
+				 ZYNQ_GPIO_BANK3_NGPIO)
+
+#define ZYNQ_GPIO_BANK0_PIN_MIN	0
+#define ZYNQ_GPIO_BANK0_PIN_MAX	(ZYNQ_GPIO_BANK0_PIN_MIN + \
+					ZYNQ_GPIO_BANK0_NGPIO - 1)
+#define ZYNQ_GPIO_BANK1_PIN_MIN	(ZYNQ_GPIO_BANK0_PIN_MAX + 1)
+#define ZYNQ_GPIO_BANK1_PIN_MAX	(ZYNQ_GPIO_BANK1_PIN_MIN + \
+					ZYNQ_GPIO_BANK1_NGPIO - 1)
+#define ZYNQ_GPIO_BANK2_PIN_MIN	(ZYNQ_GPIO_BANK1_PIN_MAX + 1)
+#define ZYNQ_GPIO_BANK2_PIN_MAX	(ZYNQ_GPIO_BANK2_PIN_MIN + \
+					ZYNQ_GPIO_BANK2_NGPIO - 1)
+#define ZYNQ_GPIO_BANK3_PIN_MIN	(ZYNQ_GPIO_BANK2_PIN_MAX + 1)
+#define ZYNQ_GPIO_BANK3_PIN_MAX	(ZYNQ_GPIO_BANK3_PIN_MIN + \
+					ZYNQ_GPIO_BANK3_NGPIO - 1)
+
+
+/* Register offsets for the GPIO device */
+/* LSW Mask & Data -WO */
+#define ZYNQ_GPIO_DATA_LSW_OFFSET(BANK)	(0x000 + (8 * BANK))
+/* MSW Mask & Data -WO */
+#define ZYNQ_GPIO_DATA_MSW_OFFSET(BANK)	(0x004 + (8 * BANK))
+/* Data Register-RW */
+#define ZYNQ_GPIO_DATA_RO_OFFSET(BANK)	(0x060 + (4 * BANK))
+/* Direction mode reg-RW */
+#define ZYNQ_GPIO_DIRM_OFFSET(BANK)	(0x204 + (0x40 * BANK))
+/* Output enable reg-RW */
+#define ZYNQ_GPIO_OUTEN_OFFSET(BANK)	(0x208 + (0x40 * BANK))
+/* Interrupt mask reg-RO */
+#define ZYNQ_GPIO_INTMASK_OFFSET(BANK)	(0x20C + (0x40 * BANK))
+/* Interrupt enable reg-WO */
+#define ZYNQ_GPIO_INTEN_OFFSET(BANK)	(0x210 + (0x40 * BANK))
+/* Interrupt disable reg-WO */
+#define ZYNQ_GPIO_INTDIS_OFFSET(BANK)	(0x214 + (0x40 * BANK))
+/* Interrupt status reg-RO */
+#define ZYNQ_GPIO_INTSTS_OFFSET(BANK)	(0x218 + (0x40 * BANK))
+/* Interrupt type reg-RW */
+#define ZYNQ_GPIO_INTTYPE_OFFSET(BANK)	(0x21C + (0x40 * BANK))
+/* Interrupt polarity reg-RW */
+#define ZYNQ_GPIO_INTPOL_OFFSET(BANK)	(0x220 + (0x40 * BANK))
+/* Interrupt on any, reg-RW */
+#define ZYNQ_GPIO_INTANY_OFFSET(BANK)	(0x224 + (0x40 * BANK))
+
+/* Disable all interrupts mask */
+#define ZYNQ_GPIO_IXR_DISABLE_ALL	0xFFFFFFFF
+
+/* Mid pin number of a bank */
+#define ZYNQ_GPIO_MID_PIN_NUM 16
+
+/* GPIO upper 16 bit mask */
+#define ZYNQ_GPIO_UPPER_MASK 0xFFFF0000
+
+/**
+ * struct zynq_gpio - gpio device private data structure
+ * @chip:	instance of the gpio_chip
+ * @base_addr:	base address of the GPIO device
+ * @clk:	clock resource for this controller
+ */
+struct zynq_gpio {
+	struct gpio_chip chip;
+	void __iomem *base_addr;
+	struct clk *clk;
+};
+
+/**
+ * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank
+ * for a given pin in the GPIO device
+ * @pin_num:	gpio pin number within the device
+ * @bank_num:	an output parameter used to return the bank number of the gpio
+ *		pin
+ * @bank_pin_num: an output parameter used to return pin number within a bank
+ *		  for the given gpio pin
+ *
+ * Returns the bank number and pin offset within the bank.
+ */
+static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
+					  unsigned int *bank_num,
+					  unsigned int *bank_pin_num)
+{
+	switch (pin_num) {
+	case ZYNQ_GPIO_BANK0_PIN_MIN ... ZYNQ_GPIO_BANK0_PIN_MAX:
+		*bank_num = 0;
+		*bank_pin_num = pin_num;
+		break;
+	case ZYNQ_GPIO_BANK1_PIN_MIN ... ZYNQ_GPIO_BANK1_PIN_MAX:
+		*bank_num = 1;
+		*bank_pin_num = pin_num - ZYNQ_GPIO_BANK1_PIN_MIN;
+		break;
+	case ZYNQ_GPIO_BANK2_PIN_MIN ... ZYNQ_GPIO_BANK2_PIN_MAX:
+		*bank_num = 2;
+		*bank_pin_num = pin_num - ZYNQ_GPIO_BANK2_PIN_MIN;
+		break;
+	case ZYNQ_GPIO_BANK3_PIN_MIN ... ZYNQ_GPIO_BANK3_PIN_MAX:
+		*bank_num = 3;
+		*bank_pin_num = pin_num - ZYNQ_GPIO_BANK3_PIN_MIN;
+		break;
+	default:
+		WARN(true, "invalid GPIO pin number: %u", pin_num);
+		*bank_num = 0;
+		*bank_pin_num = 0;
+		break;
+	}
+}
+
+/**
+ * zynq_gpio_get_value - Get the state of the specified pin of GPIO device
+ * @chip:	gpio_chip instance to be worked on
+ * @pin:	gpio pin number within the device
+ *
+ * This function reads the state of the specified pin of the GPIO device.
+ *
+ * Return: 0 if the pin is low, 1 if pin is high.
+ */
+static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
+{
+	u32 data;
+	unsigned int bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);
+
+	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num);
+
+	data = readl_relaxed(gpio->base_addr +
+			     ZYNQ_GPIO_DATA_RO_OFFSET(bank_num));
+
+	return (data >> bank_pin_num) & 1;
+}
+
+/**
+ * zynq_gpio_set_value - Modify the state of the pin with specified value
+ * @chip:	gpio_chip instance to be worked on
+ * @pin:	gpio pin number within the device
+ * @state:	value used to modify the state of the specified pin
+ *
+ * This function calculates the register offset (i.e to lower 16 bits or
+ * upper 16 bits) based on the given pin number and sets the state of a
+ * gpio pin to the specified value. The state is either 0 or non-zero.
+ */
+static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
+				int state)
+{
+	unsigned int reg_offset, bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);
+
+	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num);
+
+	if (bank_pin_num >= ZYNQ_GPIO_MID_PIN_NUM) {
+		/* only 16 data bits in bit maskable reg */
+		bank_pin_num -= ZYNQ_GPIO_MID_PIN_NUM;
+		reg_offset = ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num);
+	} else {
+		reg_offset = ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num);
+	}
+
+	/*
+	 * get the 32 bit value to be written to the mask/data register where
+	 * the upper 16 bits is the mask and lower 16 bits is the data
+	 */
+	state = !!state;
+	state = ~(1 << (bank_pin_num + ZYNQ_GPIO_MID_PIN_NUM)) &
+		((state << bank_pin_num) | ZYNQ_GPIO_UPPER_MASK);
+
+	writel_relaxed(state, gpio->base_addr + reg_offset);
+}
+
+/**
+ * zynq_gpio_dir_in - Set the direction of the specified GPIO pin as input
+ * @chip:	gpio_chip instance to be worked on
+ * @pin:	gpio pin number within the device
+ *
+ * This function uses the read-modify-write sequence to set the direction of
+ * the gpio pin as input.
+ *
+ * Return: 0 always
+ */
+static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
+{
+	u32 reg;
+	unsigned int bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);
+
+	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num);
+
+	/* bank 0 pins 7 and 8 are special and cannot be used as inputs */
+	if (bank_num == 0 && (bank_pin_num == 7 || bank_pin_num == 8))
+		return -EINVAL;
+
+	/* clear the bit in direction mode reg to set the pin as input */
+	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+	reg &= ~BIT(bank_pin_num);
+	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+
+	return 0;
+}
+
+/**
+ * zynq_gpio_dir_out - Set the direction of the specified GPIO pin as output
+ * @chip:	gpio_chip instance to be worked on
+ * @pin:	gpio pin number within the device
+ * @state:	value to be written to specified pin
+ *
+ * This function sets the direction of specified GPIO pin as output, configures
+ * the Output Enable register for the pin and uses zynq_gpio_set to set
+ * the state of the pin to the value specified.
+ *
+ * Return: 0 always
+ */
+static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
+			     int state)
+{
+	u32 reg;
+	unsigned int bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);
+
+	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num);
+
+	/* set the GPIO pin as output */
+	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+	reg |= BIT(bank_pin_num);
+	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+
+	/* configure the output enable reg for the pin */
+	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+	reg |= BIT(bank_pin_num);
+	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+
+	/* set the state of the pin */
+	zynq_gpio_set_value(chip, pin, state);
+	return 0;
+}
+
+/**
+ * zynq_gpio_irq_mask - Disable the interrupts for a gpio pin
+ * @irq_data:	per irq and chip data passed down to chip functions
+ *
+ * This function calculates gpio pin number from irq number and sets the
+ * bit in the Interrupt Disable register of the corresponding bank to disable
+ * interrupts for that pin.
+ */
+static void zynq_gpio_irq_mask(struct irq_data *irq_data)
+{
+	unsigned int device_pin_num, bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);
+
+	device_pin_num = irq_data->hwirq;
+	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num);
+	writel_relaxed(BIT(bank_pin_num),
+		       gpio->base_addr + ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
+}
+
+/**
+ * zynq_gpio_irq_unmask - Enable the interrupts for a gpio pin
+ * @irq_data:	irq data containing irq number of gpio pin for the interrupt
+ *		to enable
+ *
+ * This function calculates the gpio pin number from irq number and sets the
+ * bit in the Interrupt Enable register of the corresponding bank to enable
+ * interrupts for that pin.
+ */
+static void zynq_gpio_irq_unmask(struct irq_data *irq_data)
+{
+	unsigned int device_pin_num, bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);
+
+	device_pin_num = irq_data->hwirq;
+	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num);
+	writel_relaxed(BIT(bank_pin_num),
+		       gpio->base_addr + ZYNQ_GPIO_INTEN_OFFSET(bank_num));
+}
+
+/**
+ * zynq_gpio_irq_ack - Acknowledge the interrupt of a gpio pin
+ * @irq_data:	irq data containing irq number of gpio pin for the interrupt
+ *		to ack
+ *
+ * This function calculates gpio pin number from irq number and sets the bit
+ * in the Interrupt Status Register of the corresponding bank, to ACK the irq.
+ */
+static void zynq_gpio_irq_ack(struct irq_data *irq_data)
+{
+	unsigned int device_pin_num, bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);
+
+	device_pin_num = irq_data->hwirq;
+	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num);
+	writel_relaxed(BIT(bank_pin_num),
+		       gpio->base_addr + ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
+}
+
+/**
+ * zynq_gpio_irq_enable - Enable the interrupts for a gpio pin
+ * @irq_data:	irq data containing irq number of gpio pin for the interrupt
+ *		to enable
+ *
+ * Clears the INTSTS bit and unmasks the given interrrupt.
+ */
+static void zynq_gpio_irq_enable(struct irq_data *irq_data)
+{
+	/*
+	 * The Zynq GPIO controller does not disable interrupt detection when
+	 * the interrupt is masked and only disables the propagation of the
+	 * interrupt. This means when the controller detects an interrupt
+	 * condition while the interrupt is logically disabled it will propagate
+	 * that interrupt event once the interrupt is enabled. This will cause
+	 * the interrupt consumer to see spurious interrupts to prevent this
+	 * first make sure that the interrupt is not asserted and then enable
+	 * it.
+	 */
+	zynq_gpio_irq_ack(irq_data);
+	zynq_gpio_irq_unmask(irq_data);
+}
+
+/**
+ * zynq_gpio_set_irq_type - Set the irq type for a gpio pin
+ * @irq_data:	irq data containing irq number of gpio pin
+ * @type:	interrupt type that is to be set for the gpio pin
+ *
+ * This function gets the gpio pin number and its bank from the gpio pin number
+ * and configures the INT_TYPE, INT_POLARITY and INT_ANY registers.
+ *
+ * Return: 0, negative error otherwise.
+ * TYPE-EDGE_RISING,  INT_TYPE - 1, INT_POLARITY - 1,  INT_ANY - 0;
+ * TYPE-EDGE_FALLING, INT_TYPE - 1, INT_POLARITY - 0,  INT_ANY - 0;
+ * TYPE-EDGE_BOTH,    INT_TYPE - 1, INT_POLARITY - NA, INT_ANY - 1;
+ * TYPE-LEVEL_HIGH,   INT_TYPE - 0, INT_POLARITY - 1,  INT_ANY - NA;
+ * TYPE-LEVEL_LOW,    INT_TYPE - 0, INT_POLARITY - 0,  INT_ANY - NA
+ */
+static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type)
+{
+	u32 int_type, int_pol, int_any;
+	unsigned int device_pin_num, bank_num, bank_pin_num;
+	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);
+
+	device_pin_num = irq_data->hwirq;
+	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num);
+
+	int_type = readl_relaxed(gpio->base_addr +
+				 ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
+	int_pol = readl_relaxed(gpio->base_addr +
+				ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
+	int_any = readl_relaxed(gpio->base_addr +
+				ZYNQ_GPIO_INTANY_OFFSET(bank_num));
+
+	/*
+	 * based on the type requested, configure the INT_TYPE, INT_POLARITY
+	 * and INT_ANY registers
+	 */
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		int_type |= BIT(bank_pin_num);
+		int_pol |= BIT(bank_pin_num);
+		int_any &= ~BIT(bank_pin_num);
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		int_type |= BIT(bank_pin_num);
+		int_pol &= ~BIT(bank_pin_num);
+		int_any &= ~BIT(bank_pin_num);
+		break;
+	case IRQ_TYPE_EDGE_BOTH:
+		int_type |= BIT(bank_pin_num);
+		int_any |= BIT(bank_pin_num);
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		int_type &= ~BIT(bank_pin_num);
+		int_pol |= BIT(bank_pin_num);
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		int_type &= ~BIT(bank_pin_num);
+		int_pol &= ~BIT(bank_pin_num);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	writel_relaxed(int_type,
+		       gpio->base_addr + ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
+	writel_relaxed(int_pol,
+		       gpio->base_addr + ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
+	writel_relaxed(int_any,
+		       gpio->base_addr + ZYNQ_GPIO_INTANY_OFFSET(bank_num));
+	return 0;
+}
+
+static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
+{
+	if (on)
+		zynq_gpio_irq_unmask(data);
+	else
+		zynq_gpio_irq_mask(data);
+
+	return 0;
+}
+
+/* irq chip descriptor */
+static struct irq_chip zynq_gpio_irqchip = {
+	.name		= DRIVER_NAME,
+	.irq_enable	= zynq_gpio_irq_enable,
+	.irq_mask	= zynq_gpio_irq_mask,
+	.irq_unmask	= zynq_gpio_irq_unmask,
+	.irq_set_type	= zynq_gpio_set_irq_type,
+	.irq_set_wake	= zynq_gpio_set_wake,
+};
+
+/**
+ * zynq_gpio_irqhandler - IRQ handler for the gpio banks of a gpio device
+ * @irq:	irq number of the gpio bank where interrupt has occurred
+ * @desc:	irq descriptor instance of the 'irq'
+ *
+ * This function reads the Interrupt Status Register of each bank to get the
+ * gpio pin number which has triggered an interrupt. It then acks the triggered
+ * interrupt and calls the pin specific handler set by the higher layer
+ * application for that pin.
+ * Note: A bug is reported if no handler is set for the gpio pin.
+ */
+static void zynq_gpio_irqhandler(unsigned int irq, struct irq_desc *desc)
+{
+	u32 int_sts, int_enb;
+	unsigned int bank_num;
+	struct zynq_gpio *gpio = irq_get_handler_data(irq);
+	struct irq_chip *irqchip = irq_desc_get_chip(desc);
+
+	chained_irq_enter(irqchip, desc);
+
+	for (bank_num = 0; bank_num < ZYNQ_GPIO_MAX_BANK; bank_num++) {
+		int_sts = readl_relaxed(gpio->base_addr +
+					ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
+		int_enb = readl_relaxed(gpio->base_addr +
+					ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
+		int_sts &= ~int_enb;
+		if (int_sts) {
+			int offset;
+			unsigned long pending = int_sts;
+
+			for_each_set_bit(offset, &pending, 32) {
+				unsigned int gpio_irq =
+					irq_find_mapping(gpio->chip.irqdomain,
+							offset);
+				generic_handle_irq(gpio_irq);
+			}
+
+			/* clear IRQ in HW */
+			writel_relaxed(int_sts, gpio->base_addr +
+					ZYNQ_GPIO_INTSTS_OFFSET(bank_num));
+		}
+	}
+
+	chained_irq_exit(irqchip, desc);
+}
+
+static int __maybe_unused zynq_gpio_suspend(struct device *dev)
+{
+	if (!device_may_wakeup(dev))
+		return pm_runtime_force_suspend(dev);
+
+	return 0;
+}
+
+static int __maybe_unused zynq_gpio_resume(struct device *dev)
+{
+	if (!device_may_wakeup(dev))
+		return pm_runtime_force_resume(dev);
+
+	return 0;
+}
+
+static int __maybe_unused zynq_gpio_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct zynq_gpio *gpio = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(gpio->clk);
+
+	return 0;
+}
+
+static int __maybe_unused zynq_gpio_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct zynq_gpio *gpio = platform_get_drvdata(pdev);
+
+	return clk_prepare_enable(gpio->clk);
+}
+
+static int zynq_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	int ret;
+
+	ret = pm_runtime_get_sync(chip->dev);
+
+	/*
+	 * If the device is already active pm_runtime_get() will return 1 on
+	 * success, but gpio_request still needs to return 0.
+	 */
+	return ret < 0 ? ret : 0;
+}
+
+static void zynq_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pm_runtime_put(chip->dev);
+}
+
+static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(zynq_gpio_suspend, zynq_gpio_resume)
+	SET_PM_RUNTIME_PM_OPS(zynq_gpio_runtime_suspend,
+			zynq_gpio_runtime_resume, NULL)
+};
+
+/**
+ * zynq_gpio_probe - Initialization method for a zynq_gpio device
+ * @pdev:	platform device instance
+ *
+ * This function allocates memory resources for the gpio device and registers
+ * all the banks of the device. It will also set up interrupts for the gpio
+ * pins.
+ * Note: Interrupts are disabled for all the banks during initialization.
+ *
+ * Return: 0 on success, negative error otherwise.
+ */
+static int zynq_gpio_probe(struct platform_device *pdev)
+{
+	int ret, bank_num, irq;
+	struct zynq_gpio *gpio;
+	struct gpio_chip *chip;
+	struct resource *res;
+
+	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+	if (!gpio)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, gpio);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	gpio->base_addr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(gpio->base_addr))
+		return PTR_ERR(gpio->base_addr);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "invalid IRQ\n");
+		return irq;
+	}
+
+	/* configure the gpio chip */
+	chip = &gpio->chip;
+	chip->label = "zynq_gpio";
+	chip->owner = THIS_MODULE;
+	chip->dev = &pdev->dev;
+	chip->get = zynq_gpio_get_value;
+	chip->set = zynq_gpio_set_value;
+	chip->request = zynq_gpio_request;
+	chip->free = zynq_gpio_free;
+	chip->direction_input = zynq_gpio_dir_in;
+	chip->direction_output = zynq_gpio_dir_out;
+	chip->base = -1;
+	chip->ngpio = ZYNQ_GPIO_NR_GPIOS;
+
+	/* Enable GPIO clock */
+	gpio->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(gpio->clk)) {
+		dev_err(&pdev->dev, "input clock not found.\n");
+		return PTR_ERR(gpio->clk);
+	}
+	ret = clk_prepare_enable(gpio->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to enable clock.\n");
+		return ret;
+	}
+
+	/* report a bug if gpio chip registration fails */
+	ret = gpiochip_add(chip);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add gpio chip\n");
+		goto err_disable_clk;
+	}
+
+	/* disable interrupts for all banks */
+	for (bank_num = 0; bank_num < ZYNQ_GPIO_MAX_BANK; bank_num++)
+		writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
+			       ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
+
+	ret = gpiochip_irqchip_add(chip, &zynq_gpio_irqchip, 0,
+				   handle_simple_irq, IRQ_TYPE_NONE);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add irq chip\n");
+		goto err_rm_gpiochip;
+	}
+
+	gpiochip_set_chained_irqchip(chip, &zynq_gpio_irqchip, irq,
+				     zynq_gpio_irqhandler);
+
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	device_set_wakeup_capable(&pdev->dev, 1);
+
+	return 0;
+
+err_rm_gpiochip:
+	if (gpiochip_remove(chip))
+		dev_err(&pdev->dev, "Failed to remove gpio chip\n");
+err_disable_clk:
+	clk_disable_unprepare(gpio->clk);
+
+	return ret;
+}
+
+/**
+ * zynq_gpio_remove - Driver removal function
+ * @pdev:	platform device instance
+ *
+ * Return: 0 always
+ */
+static int zynq_gpio_remove(struct platform_device *pdev)
+{
+	int ret;
+	struct zynq_gpio *gpio = platform_get_drvdata(pdev);
+
+	pm_runtime_get_sync(&pdev->dev);
+
+	ret = gpiochip_remove(&gpio->chip);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to remove gpio chip\n");
+		return ret;
+	}
+	clk_disable_unprepare(gpio->clk);
+	device_set_wakeup_capable(&pdev->dev, 0);
+	return 0;
+}
+
+static struct of_device_id zynq_gpio_of_match[] = {
+	{ .compatible = "xlnx,zynq-gpio-1.0", },
+	{ /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
+
+static struct platform_driver zynq_gpio_driver = {
+	.driver	= {
+		.name = DRIVER_NAME,
+		.owner = THIS_MODULE,
+		.pm = &zynq_gpio_dev_pm_ops,
+		.of_match_table = zynq_gpio_of_match,
+	},
+	.probe = zynq_gpio_probe,
+	.remove = zynq_gpio_remove,
+};
+
+/**
+ * zynq_gpio_init - Initial driver registration call
+ *
+ * Return: value from platform_driver_register
+ */
+static int __init zynq_gpio_init(void)
+{
+	return platform_driver_register(&zynq_gpio_driver);
+}
+postcore_initcall(zynq_gpio_init);
+
+MODULE_AUTHOR("Xilinx Inc.");
+MODULE_DESCRIPTION("Zynq GPIO driver");
+MODULE_LICENSE("GPL");

drivers/gpio/gpiolib-acpi.c

···
 
 	gpiod_direction_input(desc);
 
-	ret = gpiod_lock_as_irq(desc);
+	ret = gpio_lock_as_irq(chip, pin);
 	if (ret) {
 		dev_err(chip->dev, "Failed to lock GPIO as interrupt\n");
 		goto fail_free_desc;
···
 fail_free_event:
 	kfree(event);
 fail_unlock_irq:
-	gpiod_unlock_as_irq(desc);
+	gpio_unlock_as_irq(chip, pin);
 fail_free_desc:
 	gpiochip_free_own_desc(desc);
 
···
 
 /**
  * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
- * @acpi_gpio:      ACPI GPIO chip
+ * @chip:      GPIO chip
  *
  * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
  * handled by ACPI event methods which need to be called from the GPIO
···
  * gpio pins have acpi event methods and assigns interrupt handlers that calls
  * the acpi event methods for those pins.
  */
-static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio)
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
 {
-	struct gpio_chip *chip = acpi_gpio->chip;
+	struct acpi_gpio_chip *acpi_gpio;
+	acpi_handle handle;
+	acpi_status status;
 
-	if (!chip->to_irq)
+	if (!chip->dev || !chip->to_irq)
+		return;
+
+	handle = ACPI_HANDLE(chip->dev);
+	if (!handle)
+		return;
+
+	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+	if (ACPI_FAILURE(status))
 		return;
 
 	INIT_LIST_HEAD(&acpi_gpio->events);
···
 
 /**
  * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
- * @acpi_gpio:      ACPI GPIO chip
+ * @chip:      GPIO chip
  *
  * Free interrupts associated with GPIO ACPI event method for the given
  * GPIO chip.
  */
-static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
 {
+	struct acpi_gpio_chip *acpi_gpio;
 	struct acpi_gpio_event *event, *ep;
-	struct gpio_chip *chip = acpi_gpio->chip;
+	acpi_handle handle;
+	acpi_status status;
 
-	if (!chip->to_irq)
+	if (!chip->dev || !chip->to_irq)
+		return;
+
+	handle = ACPI_HANDLE(chip->dev);
+	if (!handle)
+		return;
+
+	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
+	if (ACPI_FAILURE(status))
 		return;
 
 	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
···
 		desc = gpiochip_get_desc(chip, event->pin);
 		if (WARN_ON(IS_ERR(desc)))
 			continue;
-		gpiod_unlock_as_irq(desc);
+		gpio_unlock_as_irq(chip, event->pin);
 		gpiochip_free_own_desc(desc);
 		list_del(&event->node);
 		kfree(event);
···
 		return;
 	}
 
-	acpi_gpiochip_request_interrupts(acpi_gpio);
 	acpi_gpiochip_request_regions(acpi_gpio);
 }
 
···
 	}
 
 	acpi_gpiochip_free_regions(acpi_gpio);
-	acpi_gpiochip_free_interrupts(acpi_gpio);
 
 	acpi_detach_data(handle, acpi_gpio_chip_dh);
 	kfree(acpi_gpio);

drivers/gpio/gpiolib-legacy.c

···
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+
+#include <linux/gpio.h>
+
+#include "gpiolib.h"
+
+void gpio_free(unsigned gpio)
+{
+	gpiod_free(gpio_to_desc(gpio));
+}
+EXPORT_SYMBOL_GPL(gpio_free);
+
+/**
+ * gpio_request_one - request a single GPIO with initial configuration
+ * @gpio:	the GPIO number
+ * @flags:	GPIO configuration as specified by GPIOF_*
+ * @label:	a literal description string of this GPIO
+ */
+int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
+{
+	struct gpio_desc *desc;
+	int err;
+
+	desc = gpio_to_desc(gpio);
+
+	err = gpiod_request(desc, label);
+	if (err)
+		return err;
+
+	if (flags & GPIOF_OPEN_DRAIN)
+		set_bit(FLAG_OPEN_DRAIN, &desc->flags);
+
+	if (flags & GPIOF_OPEN_SOURCE)
+		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
+
+	if (flags & GPIOF_ACTIVE_LOW)
+		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
+
+	if (flags & GPIOF_DIR_IN)
+		err = gpiod_direction_input(desc);
+	else
+		err = gpiod_direction_output_raw(desc,
+				(flags & GPIOF_INIT_HIGH) ? 1 : 0);
+
+	if (err)
+		goto free_gpio;
+
+	if (flags & GPIOF_EXPORT) {
+		err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
+		if (err)
+			goto free_gpio;
+	}
+
+	return 0;
+
+ free_gpio:
+	gpiod_free(desc);
+	return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_one);
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	return gpiod_request(gpio_to_desc(gpio), label);
+}
+EXPORT_SYMBOL_GPL(gpio_request);
+
+/**
+ * gpio_request_array - request multiple GPIOs in a single call
+ * @array:	array of the 'struct gpio'
+ * @num:	how many GPIOs in the array
+ */
+int gpio_request_array(const struct gpio *array, size_t num)
+{
+	int i, err;
+
+	for (i = 0; i < num; i++, array++) {
+		err = gpio_request_one(array->gpio, array->flags, array->label);
+		if (err)
+			goto err_free;
+	}
+	return 0;
+
+err_free:
+	while (i--)
+		gpio_free((--array)->gpio);
+	return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_array);
+
+/**
+ * gpio_free_array - release multiple GPIOs in a single call
+ * @array:	array of the 'struct gpio'
+ * @num:	how many GPIOs in the array
+ */
+void gpio_free_array(const struct gpio *array, size_t num)
+{
+	while (num--)
+		gpio_free((array++)->gpio);
+}
+EXPORT_SYMBOL_GPL(gpio_free_array);

drivers/gpio/gpiolib-of.c

···
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/slab.h>
 
-struct gpio_desc;
+#include "gpiolib.h"
 
 /* Private data structure for of_gpiochip_find_and_xlate */
 struct gg_data {
···
 	ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
 					 &gg_data.gpiospec);
 	if (ret) {
-		pr_debug("%s: can't parse gpios property of node '%s[%d]'\n",
-			__func__, np->full_name, index);
+		pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
+			__func__, propname, np->full_name, index);
 		return ERR_PTR(ret);
 	}
 
 	gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
 
 	of_node_put(gg_data.gpiospec.np);
-	pr_debug("%s exited with status %d\n", __func__,
+	pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
+		 __func__, propname, np->full_name, index,
 		 PTR_ERR_OR_ZERO(gg_data.out_gpio));
 	return gg_data.out_gpio;
 }
-EXPORT_SYMBOL(of_get_named_gpiod_flags);
 
 int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
 			    int index, enum of_gpio_flags *flags)

drivers/gpio/gpiolib-sysfs.c

···
+#include <linux/idr.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/kdev_t.h>
+
+#include "gpiolib.h"
+
+static DEFINE_IDR(dirent_idr);
+
+
+/* lock protects against unexport_gpio() being called while
+ * sysfs files are active.
+ */
+static DEFINE_MUTEX(sysfs_lock);
+
+/*
+ * /sys/class/gpio/gpioN... only for GPIOs that are exported
+ *   /direction
+ *      * MAY BE OMITTED if kernel won't allow direction changes
+ *      * is read/write as "in" or "out"
+ *      * may also be written as "high" or "low", initializing
+ *        output value as specified ("out" implies "low")
+ *   /value
+ *      * always readable, subject to hardware behavior
+ *      * may be writable, as zero/nonzero
+ *   /edge
+ *      * configures behavior of poll(2) on /value
+ *      * available only if pin can generate IRQs on input
+ *      * is read/write as "none", "falling", "rising", or "both"
+ *   /active_low
+ *      * configures polarity of /value
+ *      * is read/write as zero/nonzero
+ *      * also affects existing and subsequent "falling" and "rising"
+ *        /edge configuration
+ */
+
+static ssize_t gpio_direction_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	const struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags)) {
+		status = -EIO;
+	} else {
+		gpiod_get_direction(desc);
+		status = sprintf(buf, "%s\n",
+			test_bit(FLAG_IS_OUT, &desc->flags)
+				? "out" : "in");
+	}
+
+	mutex_unlock(&sysfs_lock);
+	return status;
+}
+
+static ssize_t gpio_direction_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else if (sysfs_streq(buf, "high"))
+		status = gpiod_direction_output_raw(desc, 1);
+	else if (sysfs_streq(buf, "out") || sysfs_streq(buf, "low"))
+		status = gpiod_direction_output_raw(desc, 0);
+	else if (sysfs_streq(buf, "in"))
+		status = gpiod_direction_input(desc);
+	else
+		status = -EINVAL;
+
+	mutex_unlock(&sysfs_lock);
+	return status ? : size;
+}
+
+static /* const */ DEVICE_ATTR(direction, 0644,
+		gpio_direction_show, gpio_direction_store);
+
+static ssize_t gpio_value_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else
+		status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc));
+
+	mutex_unlock(&sysfs_lock);
+	return status;
+}
+
+static ssize_t gpio_value_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else if (!test_bit(FLAG_IS_OUT, &desc->flags))
+		status = -EPERM;
+	else {
+		long		value;
+
+		status = kstrtol(buf, 0, &value);
+		if (status == 0) {
+			gpiod_set_value_cansleep(desc, value);
+			status = size;
+		}
+	}
+
+	mutex_unlock(&sysfs_lock);
+	return status;
+}
+
+static const DEVICE_ATTR(value, 0644,
+		gpio_value_show, gpio_value_store);
+
+static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
+{
+	struct kernfs_node	*value_sd = priv;
+
+	sysfs_notify_dirent(value_sd);
+	return IRQ_HANDLED;
+}
+
+static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
+		unsigned long gpio_flags)
+{
+	struct kernfs_node	*value_sd;
+	unsigned long		irq_flags;
+	int			ret, irq, id;
+
+	if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags)
+		return 0;
+
+	irq = gpiod_to_irq(desc);
+	if (irq < 0)
+		return -EIO;
+
+	id = desc->flags >> ID_SHIFT;
+	value_sd = idr_find(&dirent_idr, id);
+	if (value_sd)
+		free_irq(irq, value_sd);
+
+	desc->flags &= ~GPIO_TRIGGER_MASK;
+
+	if (!gpio_flags) {
+		gpio_unlock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
+		ret = 0;
+		goto free_id;
+	}
+
+	irq_flags = IRQF_SHARED;
+	if (test_bit(FLAG_TRIG_FALL, &gpio_flags))
+		irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
+			IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
+	if (test_bit(FLAG_TRIG_RISE, &gpio_flags))
+		irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
+			IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+
+	if (!value_sd) {
+		value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
+		if (!value_sd) {
+			ret = -ENODEV;
+			goto err_out;
+		}
+
+		ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL);
+		if (ret < 0)
+			goto free_sd;
+		id = ret;
+
+		desc->flags &= GPIO_FLAGS_MASK;
+		desc->flags |= (unsigned long)id << ID_SHIFT;
+
+		if (desc->flags >> ID_SHIFT != id) {
+			ret = -ERANGE;
+			goto free_id;
+		}
+	}
+
+	ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
+				"gpiolib", value_sd);
+	if (ret < 0)
+		goto free_id;
+
+	ret = gpio_lock_as_irq(desc->chip, gpio_chip_hwgpio(desc));
+	if (ret < 0) {
+		gpiod_warn(desc, "failed to flag the GPIO for IRQ\n");
+		goto free_id;
+	}
+
+	desc->flags |= gpio_flags;
+	return 0;
+
+free_id:
+	idr_remove(&dirent_idr, id);
+	desc->flags &= GPIO_FLAGS_MASK;
+free_sd:
+	if (value_sd)
+		sysfs_put(value_sd);
+err_out:
+	return ret;
+}
+
+static const struct {
+	const char *name;
+	unsigned long flags;
+} trigger_types[] = {
+	{ "none",    0 },
+	{ "falling", BIT(FLAG_TRIG_FALL) },
+	{ "rising",  BIT(FLAG_TRIG_RISE) },
+	{ "both",    BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE) },
+};
+
+static ssize_t gpio_edge_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	const struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else {
+		int i;
+
+		status = 0;
+		for (i = 0; i < ARRAY_SIZE(trigger_types); i++)
+			if ((desc->flags & GPIO_TRIGGER_MASK)
+					== trigger_types[i].flags) {
+				status = sprintf(buf, "%s\n",
+						 trigger_types[i].name);
+				break;
+			}
+	}
+
+	mutex_unlock(&sysfs_lock);
+	return status;
+}
+
+static ssize_t gpio_edge_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+	int			i;
+
+	for (i = 0; i < ARRAY_SIZE(trigger_types); i++)
+		if (sysfs_streq(trigger_types[i].name, buf))
+			goto found;
+	return -EINVAL;
+
+found:
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else {
+		status = gpio_setup_irq(desc, dev, trigger_types[i].flags);
+		if (!status)
+			status = size;
+	}
+
+	mutex_unlock(&sysfs_lock);
+
+	return status;
+}
+
+static DEVICE_ATTR(edge, 0644, gpio_edge_show, gpio_edge_store);
+
+static int sysfs_set_active_low(struct gpio_desc *desc, struct device *dev,
+				int value)
+{
+	int			status = 0;
+
+	if (!!test_bit(FLAG_ACTIVE_LOW, &desc->flags) == !!value)
+		return 0;
+
+	if (value)
+		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
+	else
+		clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
+
+	/* reconfigure poll(2) support if enabled on one edge only */
+	if (dev != NULL && (!!test_bit(FLAG_TRIG_RISE, &desc->flags) ^
+				!!test_bit(FLAG_TRIG_FALL, &desc->flags))) {
+		unsigned long trigger_flags = desc->flags & GPIO_TRIGGER_MASK;
+
+		gpio_setup_irq(desc, dev, 0);
+		status = gpio_setup_irq(desc, dev, trigger_flags);
+	}
+
+	return status;
+}
+
+static ssize_t gpio_active_low_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	const struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags))
+		status = -EIO;
+	else
+		status = sprintf(buf, "%d\n",
+				!!test_bit(FLAG_ACTIVE_LOW, &desc->flags));
+
+	mutex_unlock(&sysfs_lock);
+
+	return status;
+}
+
+static ssize_t gpio_active_low_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct gpio_desc	*desc = dev_get_drvdata(dev);
+	ssize_t			status;
+
+	mutex_lock(&sysfs_lock);
+
+	if (!test_bit(FLAG_EXPORT, &desc->flags)) {
+		status = -EIO;
+	} else {
+		long		value;
+
+		status = kstrtol(buf, 0, &value);
+		if (status == 0)
+			status = sysfs_set_active_low(desc, dev, value != 0);
+	}
+
+	mutex_unlock(&sysfs_lock);
+
+	return status ? : size;
+}
+
+static const DEVICE_ATTR(active_low, 0644,
+		gpio_active_low_show, gpio_active_low_store);
+
+static const struct attribute *gpio_attrs[] = {
+	&dev_attr_value.attr,
+	&dev_attr_active_low.attr,
+	NULL,
+};
+
+static const struct attribute_group gpio_attr_group = {
+	.attrs = (struct attribute **) gpio_attrs,
+};
+
+/*
+ * /sys/class/gpio/gpiochipN/
+ *   /base ... matching gpio_chip.base (N)
+ *   /label ... matching gpio_chip.label
+ *   /ngpio ... matching gpio_chip.ngpio
+ */
+
+static ssize_t chip_base_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	const struct gpio_chip	*chip = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", chip->base);
+}
+static DEVICE_ATTR(base, 0444, chip_base_show, NULL);
+
+static ssize_t chip_label_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	const struct gpio_chip	*chip = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", chip->label ? : "");
+}
+static DEVICE_ATTR(label, 0444, chip_label_show, NULL);
+
+static ssize_t chip_ngpio_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	const struct gpio_chip	*chip = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", chip->ngpio);
+}
+static DEVICE_ATTR(ngpio, 0444, chip_ngpio_show, NULL);
+
+static const struct attribute *gpiochip_attrs[] = {
+	&dev_attr_base.attr,
+	&dev_attr_label.attr,
+	&dev_attr_ngpio.attr,
+	NULL,
+};
+
+static const struct attribute_group gpiochip_attr_group = {
+	.attrs = (struct attribute **) gpiochip_attrs,
+};
+
+/*
+ * /sys/class/gpio/export ... write-only
+ *	integer N ... number of GPIO to export (full access)
+ * /sys/class/gpio/unexport ... write-only
+ *	integer N ... number of GPIO to unexport
+ */
+static ssize_t export_store(struct class *class,
+				struct class_attribute *attr,
+				const char *buf, size_t len)
+{
+	long			gpio;
+	struct gpio_desc	*desc;
+	int			status;
+
+	status = kstrtol(buf, 0, &gpio);
+	if (status < 0)
+		goto done;
+
+	desc = gpio_to_desc(gpio);
+	/* reject invalid GPIOs */
+	if (!desc) {
+		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
+		return -EINVAL;
+	}
+
+	/* No extra locking here; FLAG_SYSFS just signifies that the
+	 * request and export were done by on behalf of userspace, so
+	 * they may be undone on its behalf too.
+	 */
+
+	status = gpiod_request(desc, "sysfs");
+	if (status < 0) {
+		if (status == -EPROBE_DEFER)
+			status = -ENODEV;
+		goto done;
+	}
+	status = gpiod_export(desc, true);
+	if (status < 0)
+		gpiod_free(desc);
+	else
+		set_bit(FLAG_SYSFS, &desc->flags);
+
+done:
+	if (status)
+		pr_debug("%s: status %d\n", __func__, status);
+	return status ? : len;
+}
+
+static ssize_t unexport_store(struct class *class,
+				struct class_attribute *attr,
+				const char *buf, size_t len)
+{
+	long			gpio;
+	struct gpio_desc	*desc;
+	int			status;
+
+	status = kstrtol(buf, 0, &gpio);
+	if (status < 0)
+		goto done;
+
+	desc = gpio_to_desc(gpio);
+	/* reject bogus commands (gpio_unexport ignores them) */
+	if (!desc) {
+		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
+		return -EINVAL;
+	}
+
+	status = -EINVAL;
+
+	/* No extra locking here; FLAG_SYSFS just signifies that the
+	 * request and export were done by on behalf of userspace, so
+	 * they may be undone on its behalf too.
+	 */
+	if (test_and_clear_bit(FLAG_SYSFS, &desc->flags)) {
+		status = 0;
+		gpiod_free(desc);
+	}
+done:
+	if (status)
+		pr_debug("%s: status %d\n", __func__, status);
+	return status ? : len;
+}
+
+static struct class_attribute gpio_class_attrs[] = {
+	__ATTR(export, 0200, NULL, export_store),
+	__ATTR(unexport, 0200, NULL, unexport_store),
+	__ATTR_NULL,
+};
+
+static struct class gpio_class = {
+	.name =		"gpio",
+	.owner =	THIS_MODULE,
+
+	.class_attrs =	gpio_class_attrs,
+};
+
+
+/**
+ * gpiod_export - export a GPIO through sysfs
+ * @gpio: gpio to make available, already requested
+ * @direction_may_change: true if userspace may change gpio direction
+ * Context: arch_initcall or later
+ *
+ * When drivers want to make a GPIO accessible to userspace after they
+ * have requested it -- perhaps while debugging, or as part of their
+ * public interface -- they may use this routine.  If the GPIO can
+ * change direction (some can't) and the caller allows it, userspace
+ * will see "direction" sysfs attribute which may be used to change
+ * the gpio's direction.  A "value" attribute will always be provided.
+ *
+ * Returns zero on success, else an error.
+ */
+int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
+{
+	unsigned long		flags;
+	int			status;
+	const char		*ioname = NULL;
+	struct device		*dev;
+	int			offset;
+
+	/* can't export until sysfs is available ... */
+	if (!gpio_class.p) {
+		pr_debug("%s: called too early!\n", __func__);
+		return -ENOENT;
+	}
+
+	if (!desc) {
+		pr_debug("%s: invalid gpio descriptor\n", __func__);
+		return -EINVAL;
+	}
+
+	mutex_lock(&sysfs_lock);
+
+	spin_lock_irqsave(&gpio_lock, flags);
+	if (!test_bit(FLAG_REQUESTED, &desc->flags) ||
+	     test_bit(FLAG_EXPORT, &desc->flags)) {
+		spin_unlock_irqrestore(&gpio_lock, flags);
+		gpiod_dbg(desc, "%s: unavailable (requested=%d, exported=%d)\n",
+				__func__,
+				test_bit(FLAG_REQUESTED, &desc->flags),
+				test_bit(FLAG_EXPORT, &desc->flags));
+		status = -EPERM;
+		goto fail_unlock;
+	}
+
+	if (!desc->chip->direction_input || !desc->chip->direction_output)
+		direction_may_change = false;
+	spin_unlock_irqrestore(&gpio_lock, flags);
+
+	offset = gpio_chip_hwgpio(desc);
+	if (desc->chip->names && desc->chip->names[offset])
+		ioname = desc->chip->names[offset];
+
+	dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
+			    desc, ioname ? ioname : "gpio%u",
+			    desc_to_gpio(desc));
+	if (IS_ERR(dev)) {
+		status = PTR_ERR(dev);
+		goto fail_unlock;
+	}
+
+	status = sysfs_create_group(&dev->kobj, &gpio_attr_group);
+	if (status)
+		goto fail_unregister_device;
+
+	if (direction_may_change) {
+		status = device_create_file(dev, &dev_attr_direction);
+		if (status)
+			goto fail_unregister_device;
+	}
+
+	if (gpiod_to_irq(desc) >= 0 && (direction_may_change ||
+				       !test_bit(FLAG_IS_OUT, &desc->flags))) {
+		status = device_create_file(dev, &dev_attr_edge);
+		if (status)
+			goto fail_unregister_device;
+	}
+
+	set_bit(FLAG_EXPORT, &desc->flags);
+	mutex_unlock(&sysfs_lock);
+	return 0;
+
+fail_unregister_device:
+	device_unregister(dev);
+fail_unlock:
+	mutex_unlock(&sysfs_lock);
+	gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+	return status;
+}
+EXPORT_SYMBOL_GPL(gpiod_export);
+
+static int match_export(struct device *dev, const void *data)
+{
+	return dev_get_drvdata(dev) == data;
+}
+
+/**
+ * gpiod_export_link - create a sysfs link to an exported GPIO node
+ * @dev: device under which to create symlink
+ * @name: name of the symlink
+ * @gpio: gpio to create symlink to, already exported
+ *
+ * Set up a symlink from /sys/.../dev/name to /sys/class/gpio/gpioN
+ * node. Caller is responsible for unlinking.
+ *
+ * Returns zero on success, else an error.
+ */
+int gpiod_export_link(struct device *dev, const char *name,
+		      struct gpio_desc *desc)
+{
+	int			status = -EINVAL;
+
+	if (!desc) {
+		pr_warn("%s: invalid GPIO\n", __func__);
+		return -EINVAL;
+	}
+
+	mutex_lock(&sysfs_lock);
+
+	if (test_bit(FLAG_EXPORT, &desc->flags)) {
+		struct device *tdev;
+
+		tdev = class_find_device(&gpio_class, NULL, desc, match_export);
+		if (tdev != NULL) {
+			status = sysfs_create_link(&dev->kobj, &tdev->kobj,
+						name);
+		} else {
+			status = -ENODEV;
+		}
+	}
+
+	mutex_unlock(&sysfs_lock);
+
+	if (status)
+		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(gpiod_export_link);
+
+/**
+ * gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value
+ * @gpio: gpio to change
+ * @value: non-zero to use active low, i.e. inverted values
+ *
+ * Set the polarity of /sys/class/gpio/gpioN/value sysfs attribute.
+ * The GPIO does not have to be exported yet.  If poll(2) support has
+ * been enabled for either rising or falling edge, it will be
+ * reconfigured to follow the new polarity.
+ *
+ * Returns zero on success, else an error.
+ */
+int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
+{
+	struct device		*dev = NULL;
+	int			status = -EINVAL;
+
+	if (!desc) {
+		pr_warn("%s: invalid GPIO\n", __func__);
+		return -EINVAL;
+	}
+
+	mutex_lock(&sysfs_lock);
+
+	if (test_bit(FLAG_EXPORT, &desc->flags)) {
+		dev = class_find_device(&gpio_class, NULL, desc, match_export);
+		if (dev == NULL) {
+			status = -ENODEV;
+			goto unlock;
+		}
+	}
+
+	status = sysfs_set_active_low(desc, dev, value);
+
+unlock:
+	mutex_unlock(&sysfs_lock);
+
+	if (status)
+		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low);
+
+/**
+ * gpiod_unexport - reverse effect of gpio_export()
+ * @gpio: gpio to make unavailable
+ *
+ * This is implicit on gpio_free().
+ */
+void gpiod_unexport(struct gpio_desc *desc)
+{
+	int			status = 0;
+	struct device		*dev = NULL;
+
+	if (!desc) {
+		pr_warn("%s: invalid GPIO\n", __func__);
+		return;
+	}
+
+	mutex_lock(&sysfs_lock);
+
+	if (test_bit(FLAG_EXPORT, &desc->flags)) {
+
+		dev = class_find_device(&gpio_class, NULL, desc, match_export);
+		if (dev) {
+			gpio_setup_irq(desc, dev, 0);
+			clear_bit(FLAG_EXPORT, &desc->flags);
+		} else
+			status = -ENODEV;
+	}
+
+	mutex_unlock(&sysfs_lock);
+
+	if (dev) {
+		device_unregister(dev);
+		put_device(dev);
+	}
+
+	if (status)
+		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+}
+EXPORT_SYMBOL_GPL(gpiod_unexport);
+
+int gpiochip_export(struct gpio_chip *chip)
+{
+	int		status;
+	struct device	*dev;
+
+	/* Many systems register gpio chips for SOC support very early,
+	 * before driver model support is available.  In those cases we
+	 * export this later, in gpiolib_sysfs_init() ... here we just
+	 * verify that _some_ field of gpio_class got initialized.
+	 */
+	if (!gpio_class.p)
+		return 0;
+
+	/* use chip->base for the ID; it's already known to be unique */
+	mutex_lock(&sysfs_lock);
+	dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0), chip,
+				"gpiochip%d", chip->base);
+	if (!IS_ERR(dev)) {
+		status = sysfs_create_group(&dev->kobj,
+				&gpiochip_attr_group);
+	} else
+		status = PTR_ERR(dev);
+	chip->exported = (status == 0);
+	mutex_unlock(&sysfs_lock);
+
+	if (status)
+		chip_dbg(chip, "%s: status %d\n", __func__, status);
+
+	return status;
+}
+
+void gpiochip_unexport(struct gpio_chip *chip)
+{
+	int			status;
+	struct device		*dev;
+
+	mutex_lock(&sysfs_lock);
+	dev = class_find_device(&gpio_class, NULL, chip, match_export);
+	if (dev) {
+		put_device(dev);
+		device_unregister(dev);
+		chip->exported = false;
+		status = 0;
+	} else
+		status = -ENODEV;
+	mutex_unlock(&sysfs_lock);
+
+	if (status)
+		chip_dbg(chip, "%s: status %d\n", __func__, status);
+}
+
+static int __init gpiolib_sysfs_init(void)
+{
+	int		status;
+	unsigned long	flags;
+	struct gpio_chip *chip;
+
+	status = class_register(&gpio_class);
+	if (status < 0)
+		return status;
+
+	/* Scan and register the gpio_chips which registered very
+	 * early (e.g. before the class_register above was called).
+	 *
+	 * We run before arch_initcall() so chip->dev nodes can have
+	 * registered, and so arch_initcall() can always gpio_export().
+	 */
+	spin_lock_irqsave(&gpio_lock, flags);
+	list_for_each_entry(chip, &gpio_chips, list) {
+		if (chip->exported)
+			continue;
+
+		/*
+		 * TODO we yield gpio_lock here because gpiochip_export()
+		 * acquires a mutex. This is unsafe and needs to be fixed.
+		 *
+		 * Also it would be nice to use gpiochip_find() here so we
+		 * can keep gpio_chips local to gpiolib.c, but the yield of
+		 * gpio_lock prevents us from doing this.
+		 */
+		spin_unlock_irqrestore(&gpio_lock, flags);
+		status = gpiochip_export(chip);
+		spin_lock_irqsave(&gpio_lock, flags);
+	}
+	spin_unlock_irqrestore(&gpio_lock, flags);
+
+
+	return status;
+}
+postcore_initcall(gpiolib_sysfs_init);

drivers/gpio/gpiolib.c

···
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
 
 #include "gpiolib.h"
 
···
  * While any GPIO is requested, its gpio_chip is not removable;
  * each GPIO's "requested" flag serves as a lock and refcount.
  */
-static DEFINE_SPINLOCK(gpio_lock);
+DEFINE_SPINLOCK(gpio_lock);
 
-struct gpio_desc {
-	struct gpio_chip	*chip;
-	unsigned long		flags;
-/* flag symbols are bit numbers */
-#define FLAG_REQUESTED	0
-#define FLAG_IS_OUT	1
-#define FLAG_EXPORT	2	/* protected by sysfs_lock */
-#define FLAG_SYSFS	3	/* exported via /sys/class/gpio/control */
-#define FLAG_TRIG_FALL	4	/* trigger on falling edge */
-#define FLAG_TRIG_RISE	5	/* trigger on rising edge */
-#define FLAG_ACTIVE_LOW	6	/* value has active low */
-#define FLAG_OPEN_DRAIN	7	/* Gpio is open drain type */
-#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */
-#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */
-
-#define ID_SHIFT	16	/* add new flags before this one */
-
-#define GPIO_FLAGS_MASK		((1 << ID_SHIFT) - 1)
-#define GPIO_TRIGGER_MASK	(BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
-
-#ifdef CONFIG_DEBUG_FS
-	const char		*label;
-#endif
-};
 static struct gpio_desc gpio_desc[ARCH_NR_GPIOS];
 
 #define GPIO_OFFSET_VALID(chip, offset) (offset >= 0 && offset < chip->ngpio)
 
 static DEFINE_MUTEX(gpio_lookup_lock);
 static LIST_HEAD(gpio_lookup_list);
-static LIST_HEAD(gpio_chips);
-
-#ifdef CONFIG_GPIO_SYSFS
-static DEFINE_IDR(dirent_idr);
-#endif
-
-static int gpiod_request(struct gpio_desc *desc, const char *label);
-static void gpiod_free(struct gpio_desc *desc);
-
-/* With descriptor prefix */
-
-#ifdef CONFIG_DEBUG_FS
-#define gpiod_emerg(desc, fmt, ...)					       \
-	pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
-                 ##__VA_ARGS__)
-#define gpiod_crit(desc, fmt, ...)					       \
-	pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
-                 ##__VA_ARGS__)
-#define gpiod_err(desc, fmt, ...)					       \
-	pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
-                 ##__VA_ARGS__)
-#define gpiod_warn(desc, fmt, ...)					       \
-	pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
-                 ##__VA_ARGS__)
-#define gpiod_info(desc, fmt, ...)					       \
-	pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
-                ##__VA_ARGS__)
-#define gpiod_dbg(desc, fmt, ...)					       \
-	pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
-                 ##__VA_ARGS__)
-#else
-#define gpiod_emerg(desc, fmt, ...)					\
-	pr_emerg("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#define gpiod_crit(desc, fmt, ...)					\
-	pr_crit("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#define gpiod_err(desc, fmt, ...)					\
-	pr_err("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#define gpiod_warn(desc, fmt, ...)					\
-	pr_warn("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#define gpiod_info(desc, fmt, ...)					\
-	pr_info("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#define gpiod_dbg(desc, fmt, ...)					\
-	pr_debug("gpio-%d: " fmt, desc_to_gpio(desc), ##__VA_ARGS__)
-#endif
-
-/* With chip prefix */
-
-#define chip_emerg(chip, fmt, ...)					\
-	pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
-#define chip_crit(chip, fmt, ...)					\
-	pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
-#define chip_err(chip, fmt, ...)					\
-	pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
-#define chip_warn(chip, fmt, ...)					\
-	pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
-#define chip_info(chip, fmt, ...)					\
-	pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
-#define chip_dbg(chip, fmt, ...)					\
-	pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+LIST_HEAD(gpio_chips);
 
 static inline void desc_set_label(struct gpio_desc *d, const char *label)
 {
-#ifdef CONFIG_DEBUG_FS
 	d->label = label;
-#endif
-}
-
-/*
- * Return the GPIO number of the passed descriptor relative to its chip
- */
-static int gpio_chip_hwgpio(const struct gpio_desc *desc)
-{
-	return desc - &desc->chip->desc[0];
 }
 
 /**
···
 
 	return &chip->desc[hwnum];
 }
-EXPORT_SYMBOL_GPL(gpiochip_get_desc);
 
 /**
  * Convert a GPIO descriptor to the integer namespace.
···
 }
 EXPORT_SYMBOL_GPL(desc_to_gpio);
 
-
-/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
- * when setting direction, and otherwise illegal.  Until board setup code
- * and drivers use explicit requests everywhere (which won't happen when
- * those calls have no teeth) we can't avoid autorequesting.  This nag
- * message should motivate switching to explicit requests... so should
- * the weaker cleanup after faults, compared to gpio_request().
- *
- * NOTE: the autorequest mechanism is going away; at this point it's
- * only "legal" in the sense that (old) code using it won't break yet,
- * but instead only triggers a WARN() stack dump.
- */
-static int gpio_ensure_requested(struct gpio_desc *desc)
-{
-	const struct gpio_chip *chip = desc->chip;
-	const int gpio = desc_to_gpio(desc);
-
-	if (WARN(test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0,
-			"autorequest GPIO-%d\n", gpio)) {
-		if (!try_module_get(chip->owner)) {
-			gpiod_err(desc, "%s: module can't be gotten\n",
-					__func__);
-			clear_bit(FLAG_REQUESTED, &desc->flags);
-			/* lose */
-			return -EIO;
-		}
-		desc_set_label(desc, "[auto]");
-		/* caller must chip->request() w/o spinlock */
-		if (chip->request)
-			return 1;
-	}
-	return 0;
-}
 
 /**
  * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
···
 	return status;
 }
 EXPORT_SYMBOL_GPL(gpiod_get_direction);
-
-#ifdef CONFIG_GPIO_SYSFS
-
-/* lock protects against unexport_gpio() being called while
- * sysfs files are active.
- */
-static DEFINE_MUTEX(sysfs_lock);
-
-/*
- * /sys/class/gpio/gpioN... only for GPIOs that are exported
- *   /direction
- *      * MAY BE OMITTED if kernel won't allow direction changes
- *      * is read/write as "in" or "out"
- *      * may also be written as "high" or "low", initializing
- *        output value as specified ("out" implies "low")
- *   /value
- *      * always readable, subject to hardware behavior
- *      * may be writable, as zero/nonzero
- *   /edge
- *      * configures behavior of poll(2) on /value
- *      * available only if pin can generate IRQs on input
- *      * is read/write as "none", "falling", "rising", or "both"
- *   /active_low
- *      * configures polarity of /value
- *      * is read/write as zero/nonzero
- *      * also affects existing and subsequent "falling" and "rising"
- *        /edge configuration
- */
-
-static ssize_t gpio_direction_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	const struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags)) {
-		status = -EIO;
-	} else {
-		gpiod_get_direction(desc);
-		status = sprintf(buf, "%s\n",
-			test_bit(FLAG_IS_OUT, &desc->flags)
-				? "out" : "in");
-	}
-
-	mutex_unlock(&sysfs_lock);
-	return status;
-}
-
-static ssize_t gpio_direction_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t size)
-{
-	struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else if (sysfs_streq(buf, "high"))
-		status = gpiod_direction_output_raw(desc, 1);
-	else if (sysfs_streq(buf, "out") || sysfs_streq(buf, "low"))
-		status = gpiod_direction_output_raw(desc, 0);
-	else if (sysfs_streq(buf, "in"))
-		status = gpiod_direction_input(desc);
-	else
-		status = -EINVAL;
-
-	mutex_unlock(&sysfs_lock);
-	return status ? : size;
-}
-
-static /* const */ DEVICE_ATTR(direction, 0644,
-		gpio_direction_show, gpio_direction_store);
-
-static ssize_t gpio_value_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else
-		status = sprintf(buf, "%d\n", gpiod_get_value_cansleep(desc));
-
-	mutex_unlock(&sysfs_lock);
-	return status;
-}
-
-static ssize_t gpio_value_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t size)
-{
-	struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else if (!test_bit(FLAG_IS_OUT, &desc->flags))
-		status = -EPERM;
-	else {
-		long		value;
-
-		status = kstrtol(buf, 0, &value);
-		if (status == 0) {
-			gpiod_set_value_cansleep(desc, value);
-			status = size;
-		}
-	}
-
-	mutex_unlock(&sysfs_lock);
-	return status;
-}
-
-static const DEVICE_ATTR(value, 0644,
-		gpio_value_show, gpio_value_store);
-
-static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
-{
-	struct kernfs_node	*value_sd = priv;
-
-	sysfs_notify_dirent(value_sd);
-	return IRQ_HANDLED;
-}
-
-static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
-		unsigned long gpio_flags)
-{
-	struct kernfs_node	*value_sd;
-	unsigned long		irq_flags;
-	int			ret, irq, id;
-
-	if ((desc->flags & GPIO_TRIGGER_MASK) == gpio_flags)
-		return 0;
-
-	irq = gpiod_to_irq(desc);
-	if (irq < 0)
-		return -EIO;
-
-	id = desc->flags >> ID_SHIFT;
-	value_sd = idr_find(&dirent_idr, id);
-	if (value_sd)
-		free_irq(irq, value_sd);
-
-	desc->flags &= ~GPIO_TRIGGER_MASK;
-
-	if (!gpio_flags) {
-		gpiod_unlock_as_irq(desc);
-		ret = 0;
-		goto free_id;
-	}
-
-	irq_flags = IRQF_SHARED;
-	if (test_bit(FLAG_TRIG_FALL, &gpio_flags))
-		irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
-			IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
-	if (test_bit(FLAG_TRIG_RISE, &gpio_flags))
-		irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
-			IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
-
-	if (!value_sd) {
-		value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
-		if (!value_sd) {
-			ret = -ENODEV;
-			goto err_out;
-		}
-
-		ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL);
-		if (ret < 0)
-			goto free_sd;
-		id = ret;
-
-		desc->flags &= GPIO_FLAGS_MASK;
-		desc->flags |= (unsigned long)id << ID_SHIFT;
-
-		if (desc->flags >> ID_SHIFT != id) {
-			ret = -ERANGE;
-			goto free_id;
-		}
-	}
-
-	ret = request_any_context_irq(irq, gpio_sysfs_irq, irq_flags,
-				"gpiolib", value_sd);
-	if (ret < 0)
-		goto free_id;
-
-	ret = gpiod_lock_as_irq(desc);
-	if (ret < 0) {
-		gpiod_warn(desc, "failed to flag the GPIO for IRQ\n");
-		goto free_id;
-	}
-
-	desc->flags |= gpio_flags;
-	return 0;
-
-free_id:
-	idr_remove(&dirent_idr, id);
-	desc->flags &= GPIO_FLAGS_MASK;
-free_sd:
-	if (value_sd)
-		sysfs_put(value_sd);
-err_out:
-	return ret;
-}
-
-static const struct {
-	const char *name;
-	unsigned long flags;
-} trigger_types[] = {
-	{ "none",    0 },
-	{ "falling", BIT(FLAG_TRIG_FALL) },
-	{ "rising",  BIT(FLAG_TRIG_RISE) },
-	{ "both",    BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE) },
-};
-
-static ssize_t gpio_edge_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	const struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else {
-		int i;
-
-		status = 0;
-		for (i = 0; i < ARRAY_SIZE(trigger_types); i++)
-			if ((desc->flags & GPIO_TRIGGER_MASK)
-					== trigger_types[i].flags) {
-				status = sprintf(buf, "%s\n",
-						 trigger_types[i].name);
-				break;
-			}
-	}
-
-	mutex_unlock(&sysfs_lock);
-	return status;
-}
-
-static ssize_t gpio_edge_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t size)
-{
-	struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-	int			i;
-
-	for (i = 0; i < ARRAY_SIZE(trigger_types); i++)
-		if (sysfs_streq(trigger_types[i].name, buf))
-			goto found;
-	return -EINVAL;
-
-found:
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else {
-		status = gpio_setup_irq(desc, dev, trigger_types[i].flags);
-		if (!status)
-			status = size;
-	}
-
-	mutex_unlock(&sysfs_lock);
-
-	return status;
-}
-
-static DEVICE_ATTR(edge, 0644, gpio_edge_show, gpio_edge_store);
-
-static int sysfs_set_active_low(struct gpio_desc *desc, struct device *dev,
-				int value)
-{
-	int			status = 0;
-
-	if (!!test_bit(FLAG_ACTIVE_LOW, &desc->flags) == !!value)
-		return 0;
-
-	if (value)
-		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
-	else
-		clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
-
-	/* reconfigure poll(2) support if enabled on one edge only */
-	if (dev != NULL && (!!test_bit(FLAG_TRIG_RISE, &desc->flags) ^
-				!!test_bit(FLAG_TRIG_FALL, &desc->flags))) {
-		unsigned long trigger_flags = desc->flags & GPIO_TRIGGER_MASK;
-
-		gpio_setup_irq(desc, dev, 0);
-		status = gpio_setup_irq(desc, dev, trigger_flags);
-	}
-
-	return status;
-}
-
-static ssize_t gpio_active_low_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	const struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags))
-		status = -EIO;
-	else
-		status = sprintf(buf, "%d\n",
-				!!test_bit(FLAG_ACTIVE_LOW, &desc->flags));
-
-	mutex_unlock(&sysfs_lock);
-
-	return status;
-}
-
-static ssize_t gpio_active_low_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t size)
-{
-	struct gpio_desc	*desc = dev_get_drvdata(dev);
-	ssize_t			status;
-
-	mutex_lock(&sysfs_lock);
-
-	if (!test_bit(FLAG_EXPORT, &desc->flags)) {
-		status = -EIO;
-	} else {
-		long		value;
-
-		status = kstrtol(buf, 0, &value);
-		if (status == 0)
-			status = sysfs_set_active_low(desc, dev, value != 0);
-	}
-
-	mutex_unlock(&sysfs_lock);
-
-	return status ? : size;
-}
-
-static const DEVICE_ATTR(active_low, 0644,
-		gpio_active_low_show, gpio_active_low_store);
-
-static const struct attribute *gpio_attrs[] = {
-	&dev_attr_value.attr,
-	&dev_attr_active_low.attr,
-	NULL,
-};
-
-static const struct attribute_group gpio_attr_group = {
-	.attrs = (struct attribute **) gpio_attrs,
-};
-
-/*
- * /sys/class/gpio/gpiochipN/
- *   /base ... matching gpio_chip.base (N)
- *   /label ... matching gpio_chip.label
- *   /ngpio ... matching gpio_chip.ngpio
- */
-
-static ssize_t chip_base_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
-{
-	const struct gpio_chip	*chip = dev_get_drvdata(dev);
-
-	return sprintf(buf, "%d\n", chip->base);
-}
-static DEVICE_ATTR(base, 0444, chip_base_show, NULL);
-
-static ssize_t chip_label_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
-{
-	const struct gpio_chip	*chip = dev_get_drvdata(dev);
-
-	return sprintf(buf, "%s\n", chip->label ? : "");
-}
-static DEVICE_ATTR(label, 0444, chip_label_show, NULL);
-
-static ssize_t chip_ngpio_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
-{
-	const struct gpio_chip	*chip = dev_get_drvdata(dev);
-
-	return sprintf(buf, "%u\n", chip->ngpio);
-}
-static DEVICE_ATTR(ngpio, 0444, chip_ngpio_show, NULL);
-
-static const struct attribute *gpiochip_attrs[] = {
-	&dev_attr_base.attr,
-	&dev_attr_label.attr,
-	&dev_attr_ngpio.attr,
-	NULL,
-};
-
-static const struct attribute_group gpiochip_attr_group = {
-	.attrs = (struct attribute **) gpiochip_attrs,
-};
-
-/*
- * /sys/class/gpio/export ... write-only
- *	integer N ... number of GPIO to export (full access)
- * /sys/class/gpio/unexport ... write-only
- *	integer N ... number of GPIO to unexport
- */
-static ssize_t export_store(struct class *class,
-				struct class_attribute *attr,
-				const char *buf, size_t len)
-{
-	long			gpio;
-	struct gpio_desc	*desc;
-	int			status;
-
-	status = kstrtol(buf, 0, &gpio);
-	if (status < 0)
-		goto done;
-
-	desc = gpio_to_desc(gpio);
-	/* reject invalid GPIOs */
-	if (!desc) {
-		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
-		return -EINVAL;
-	}
-
-	/* No extra locking here; FLAG_SYSFS just signifies that the
-	 * request and export were done by on behalf of userspace, so
-	 * they may be undone on its behalf too.
-	 */
-
-	status = gpiod_request(desc, "sysfs");
-	if (status < 0) {
-		if (status == -EPROBE_DEFER)
-			status = -ENODEV;
-		goto done;
-	}
-	status = gpiod_export(desc, true);
-	if (status < 0)
-		gpiod_free(desc);
-	else
-		set_bit(FLAG_SYSFS, &desc->flags);
-
-done:
-	if (status)
-		pr_debug("%s: status %d\n", __func__, status);
-	return status ? : len;
-}
-
-static ssize_t unexport_store(struct class *class,
-				struct class_attribute *attr,
-				const char *buf, size_t len)
-{
-	long			gpio;
-	struct gpio_desc	*desc;
-	int			status;
-
-	status = kstrtol(buf, 0, &gpio);
-	if (status < 0)
-		goto done;
-
-	desc = gpio_to_desc(gpio);
-	/* reject bogus commands (gpio_unexport ignores them) */
-	if (!desc) {
-		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
-		return -EINVAL;
-	}
-
-	status = -EINVAL;
-
-	/* No extra locking here; FLAG_SYSFS just signifies that the
-	 * request and export were done by on behalf of userspace, so
-	 * they may be undone on its behalf too.
-	 */
-	if (test_and_clear_bit(FLAG_SYSFS, &desc->flags)) {
-		status = 0;
-		gpiod_free(desc);
-	}
-done:
-	if (status)
-		pr_debug("%s: status %d\n", __func__, status);
-	return status ? : len;
-}
-
-static struct class_attribute gpio_class_attrs[] = {
-	__ATTR(export, 0200, NULL, export_store),
-	__ATTR(unexport, 0200, NULL, unexport_store),
-	__ATTR_NULL,
-};
-
-static struct class gpio_class = {
-	.name =		"gpio",
-	.owner =	THIS_MODULE,
-
-	.class_attrs =	gpio_class_attrs,
-};
-
-
-/**
- * gpiod_export - export a GPIO through sysfs
- * @gpio: gpio to make available, already requested
- * @direction_may_change: true if userspace may change gpio direction
- * Context: arch_initcall or later
- *
- * When drivers want to make a GPIO accessible to userspace after they
- * have requested it -- perhaps while debugging, or as part of their
- * public interface -- they may use this routine.  If the GPIO can
- * change direction (some can't) and the caller allows it, userspace
- * will see "direction" sysfs attribute which may be used to change
- * the gpio's direction.  A "value" attribute will always be provided.
- *
- * Returns zero on success, else an error.
- */
-int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
-{
-	unsigned long		flags;
-	int			status;
-	const char		*ioname = NULL;
-	struct device		*dev;
-	int			offset;
-
-	/* can't export until sysfs is available ... */
-	if (!gpio_class.p) {
-		pr_debug("%s: called too early!\n", __func__);
-		return -ENOENT;
-	}
-
-	if (!desc) {
-		pr_debug("%s: invalid gpio descriptor\n", __func__);
-		return -EINVAL;
-	}
-
-	mutex_lock(&sysfs_lock);
-
-	spin_lock_irqsave(&gpio_lock, flags);
-	if (!test_bit(FLAG_REQUESTED, &desc->flags) ||
-	     test_bit(FLAG_EXPORT, &desc->flags)) {
-		spin_unlock_irqrestore(&gpio_lock, flags);
-		gpiod_dbg(desc, "%s: unavailable (requested=%d, exported=%d)\n",
-				__func__,
-				test_bit(FLAG_REQUESTED, &desc->flags),
-				test_bit(FLAG_EXPORT, &desc->flags));
-		status = -EPERM;
-		goto fail_unlock;
-	}
-
-	if (!desc->chip->direction_input || !desc->chip->direction_output)
-		direction_may_change = false;
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-	offset = gpio_chip_hwgpio(desc);
-	if (desc->chip->names && desc->chip->names[offset])
-		ioname = desc->chip->names[offset];
-
-	dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
-			    desc, ioname ? ioname : "gpio%u",
-			    desc_to_gpio(desc));
-	if (IS_ERR(dev)) {
-		status = PTR_ERR(dev);
-		goto fail_unlock;
-	}
-
-	status = sysfs_create_group(&dev->kobj, &gpio_attr_group);
-	if (status)
-		goto fail_unregister_device;
-
-	if (direction_may_change) {
-		status = device_create_file(dev, &dev_attr_direction);
-		if (status)
-			goto fail_unregister_device;
-	}
-
-	if (gpiod_to_irq(desc) >= 0 && (direction_may_change ||
-				       !test_bit(FLAG_IS_OUT, &desc->flags))) {
-		status = device_create_file(dev, &dev_attr_edge);
-		if (status)
-			goto fail_unregister_device;
-	}
-
-	set_bit(FLAG_EXPORT, &desc->flags);
-	mutex_unlock(&sysfs_lock);
-	return 0;
-
-fail_unregister_device:
-	device_unregister(dev);
-fail_unlock:
-	mutex_unlock(&sysfs_lock);
-	gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-	return status;
-}
-EXPORT_SYMBOL_GPL(gpiod_export);
-
-static int match_export(struct device *dev, const void *data)
-{
-	return dev_get_drvdata(dev) == data;
-}
-
-/**
- * gpiod_export_link - create a sysfs link to an exported GPIO node
- * @dev: device under which to create symlink
- * @name: name of the symlink
- * @gpio: gpio to create symlink to, already exported
- *
- * Set up a symlink from /sys/.../dev/name to /sys/class/gpio/gpioN
- * node. Caller is responsible for unlinking.
- *
- * Returns zero on success, else an error.
- */
-int gpiod_export_link(struct device *dev, const char *name,
-		      struct gpio_desc *desc)
-{
-	int			status = -EINVAL;
-
-	if (!desc) {
-		pr_warn("%s: invalid GPIO\n", __func__);
-		return -EINVAL;
-	}
-
-	mutex_lock(&sysfs_lock);
-
-	if (test_bit(FLAG_EXPORT, &desc->flags)) {
-		struct device *tdev;
-
-		tdev = class_find_device(&gpio_class, NULL, desc, match_export);
-		if (tdev != NULL) {
-			status = sysfs_create_link(&dev->kobj, &tdev->kobj,
-						name);
-		} else {
-			status = -ENODEV;
-		}
-	}
-
-	mutex_unlock(&sysfs_lock);
-
-	if (status)
-		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-
-	return status;
-}
-EXPORT_SYMBOL_GPL(gpiod_export_link);
-
-/**
- * gpiod_sysfs_set_active_low - set the polarity of gpio sysfs value
- * @gpio: gpio to change
- * @value: non-zero to use active low, i.e. inverted values
- *
- * Set the polarity of /sys/class/gpio/gpioN/value sysfs attribute.
- * The GPIO does not have to be exported yet.  If poll(2) support has
- * been enabled for either rising or falling edge, it will be
- * reconfigured to follow the new polarity.
- *
- * Returns zero on success, else an error.
- */
-int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
-{
-	struct device		*dev = NULL;
-	int			status = -EINVAL;
-
-	if (!desc) {
-		pr_warn("%s: invalid GPIO\n", __func__);
-		return -EINVAL;
-	}
-
-	mutex_lock(&sysfs_lock);
-
-	if (test_bit(FLAG_EXPORT, &desc->flags)) {
-		dev = class_find_device(&gpio_class, NULL, desc, match_export);
-		if (dev == NULL) {
-			status = -ENODEV;
-			goto unlock;
-		}
-	}
-
-	status = sysfs_set_active_low(desc, dev, value);
-
-unlock:
-	mutex_unlock(&sysfs_lock);
-
-	if (status)
-		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-
-	return status;
-}
-EXPORT_SYMBOL_GPL(gpiod_sysfs_set_active_low);
-
-/**
- * gpiod_unexport - reverse effect of gpio_export()
- * @gpio: gpio to make unavailable
- *
- * This is implicit on gpio_free().
- */
-void gpiod_unexport(struct gpio_desc *desc)
-{
-	int			status = 0;
-	struct device		*dev = NULL;
-
-	if (!desc) {
-		pr_warn("%s: invalid GPIO\n", __func__);
-		return;
-	}
-
-	mutex_lock(&sysfs_lock);
-
-	if (test_bit(FLAG_EXPORT, &desc->flags)) {
-
-		dev = class_find_device(&gpio_class, NULL, desc, match_export);
-		if (dev) {
-			gpio_setup_irq(desc, dev, 0);
-			clear_bit(FLAG_EXPORT, &desc->flags);
-		} else
-			status = -ENODEV;
-	}
-
-	mutex_unlock(&sysfs_lock);
-
-	if (dev) {
-		device_unregister(dev);
-		put_device(dev);
-	}
-
-	if (status)
-		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-}
-EXPORT_SYMBOL_GPL(gpiod_unexport);
-
-static int gpiochip_export(struct gpio_chip *chip)
-{
-	int		status;
-	struct device	*dev;
-
-	/* Many systems register gpio chips for SOC support very early,
-	 * before driver model support is available.  In those cases we
-	 * export this later, in gpiolib_sysfs_init() ... here we just
-	 * verify that _some_ field of gpio_class got initialized.
-	 */
-	if (!gpio_class.p)
-		return 0;
-
-	/* use chip->base for the ID; it's already known to be unique */
-	mutex_lock(&sysfs_lock);
-	dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0), chip,
-				"gpiochip%d", chip->base);
-	if (!IS_ERR(dev)) {
-		status = sysfs_create_group(&dev->kobj,
-				&gpiochip_attr_group);
-	} else
-		status = PTR_ERR(dev);
-	chip->exported = (status == 0);
-	mutex_unlock(&sysfs_lock);
-
-	if (status) {
-		unsigned long	flags;
-		unsigned	gpio;
-
-		spin_lock_irqsave(&gpio_lock, flags);
-		gpio = 0;
-		while (gpio < chip->ngpio)
-			chip->desc[gpio++].chip = NULL;
-		spin_unlock_irqrestore(&gpio_lock, flags);
-
-		chip_dbg(chip, "%s: status %d\n", __func__, status);
-	}
-
-	return status;
-}
-
-static void gpiochip_unexport(struct gpio_chip *chip)
-{
-	int			status;
-	struct device		*dev;
-
-	mutex_lock(&sysfs_lock);
-	dev = class_find_device(&gpio_class, NULL, chip, match_export);
-	if (dev) {
-		put_device(dev);
-		device_unregister(dev);
-		chip->exported = false;
-		status = 0;
-	} else
-		status = -ENODEV;
-	mutex_unlock(&sysfs_lock);
-
-	if (status)
-		chip_dbg(chip, "%s: status %d\n", __func__, status);
-}
-
-static int __init gpiolib_sysfs_init(void)
-{
-	int		status;
-	unsigned long	flags;
-	struct gpio_chip *chip;
-
-	status = class_register(&gpio_class);
-	if (status < 0)
-		return status;
-
-	/* Scan and register the gpio_chips which registered very
-	 * early (e.g. before the class_register above was called).
-	 *
-	 * We run before arch_initcall() so chip->dev nodes can have
-	 * registered, and so arch_initcall() can always gpio_export().
-	 */
-	spin_lock_irqsave(&gpio_lock, flags);
-	list_for_each_entry(chip, &gpio_chips, list) {
-		if (!chip || chip->exported)
-			continue;
-
-		spin_unlock_irqrestore(&gpio_lock, flags);
-		status = gpiochip_export(chip);
-		spin_lock_irqsave(&gpio_lock, flags);
-	}
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-
-	return status;
-}
-postcore_initcall(gpiolib_sysfs_init);
-
-#else
-static inline int gpiochip_export(struct gpio_chip *chip)
-{
-	return 0;
-}
-
-static inline void gpiochip_unexport(struct gpio_chip *chip)
-{
-}
-
-#endif /* CONFIG_GPIO_SYSFS */
 
 /*
  * Add a new chip to the global chips list, keeping the list of chips sorted
···
 {
 	unsigned int offset;
 
+	acpi_gpiochip_free_interrupts(gpiochip);
+
 	/* Remove all IRQ mappings and delete the domain */
 	if (gpiochip->irqdomain) {
 		for (offset = 0; offset < gpiochip->ngpio; offset++)
···
 			 */
 			gpiochip->irq_base = irq_base;
 	}
+
+	acpi_gpiochip_request_interrupts(gpiochip);
 
 	return 0;
 }
···
 	return status;
 }
 
-static int gpiod_request(struct gpio_desc *desc, const char *label)
+int gpiod_request(struct gpio_desc *desc, const char *label)
 {
 	int status = -EPROBE_DEFER;
 	struct gpio_chip *chip;
···
 
 	return status;
 }
-
-int gpio_request(unsigned gpio, const char *label)
-{
-	return gpiod_request(gpio_to_desc(gpio), label);
-}
-EXPORT_SYMBOL_GPL(gpio_request);
 
 static bool __gpiod_free(struct gpio_desc *desc)
 {
···
 	return ret;
 }
 
-static void gpiod_free(struct gpio_desc *desc)
+void gpiod_free(struct gpio_desc *desc)
 {
 	if (desc && __gpiod_free(desc))
 		module_put(desc->chip->owner);
···
 		WARN_ON(extra_checks);
 }
 
-void gpio_free(unsigned gpio)
-{
-	gpiod_free(gpio_to_desc(gpio));
-}
-EXPORT_SYMBOL_GPL(gpio_free);
-
-/**
- * gpio_request_one - request a single GPIO with initial configuration
- * @gpio:	the GPIO number
- * @flags:	GPIO configuration as specified by GPIOF_*
- * @label:	a literal description string of this GPIO
- */
-int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
-{
-	struct gpio_desc *desc;
-	int err;
-
-	desc = gpio_to_desc(gpio);
-
-	err = gpiod_request(desc, label);
-	if (err)
-		return err;
-
-	if (flags & GPIOF_OPEN_DRAIN)
-		set_bit(FLAG_OPEN_DRAIN, &desc->flags);
-
-	if (flags & GPIOF_OPEN_SOURCE)
-		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
-
-	if (flags & GPIOF_DIR_IN)
-		err = gpiod_direction_input(desc);
-	else
-		err = gpiod_direction_output_raw(desc,
-				(flags & GPIOF_INIT_HIGH) ? 1 : 0);
-
-	if (err)
-		goto free_gpio;
-
-	if (flags & GPIOF_EXPORT) {
-		err = gpiod_export(desc, flags & GPIOF_EXPORT_CHANGEABLE);
-		if (err)
-			goto free_gpio;
-	}
-
-	return 0;
-
- free_gpio:
-	gpiod_free(desc);
-	return err;
-}
-EXPORT_SYMBOL_GPL(gpio_request_one);
-
-/**
- * gpio_request_array - request multiple GPIOs in a single call
- * @array:	array of the 'struct gpio'
- * @num:	how many GPIOs in the array
- */
-int gpio_request_array(const struct gpio *array, size_t num)
-{
-	int i, err;
-
-	for (i = 0; i < num; i++, array++) {
-		err = gpio_request_one(array->gpio, array->flags, array->label);
-		if (err)
-			goto err_free;
-	}
-	return 0;
-
-err_free:
-	while (i--)
-		gpio_free((--array)->gpio);
-	return err;
-}
-EXPORT_SYMBOL_GPL(gpio_request_array);
-
-/**
- * gpio_free_array - release multiple GPIOs in a single call
- * @array:	array of the 'struct gpio'
- * @num:	how many GPIOs in the array
- */
-void gpio_free_array(const struct gpio *array, size_t num)
-{
-	while (num--)
-		gpio_free((array++)->gpio);
-}
-EXPORT_SYMBOL_GPL(gpio_free_array);
-
 /**
  * gpiochip_is_requested - return string iff signal was requested
  * @chip: controller managing the signal
  * @offset: of signal within controller's 0..(ngpio - 1) range
  *
  * Returns NULL if the GPIO is not currently requested, else a string.
- * If debugfs support is enabled, the string returned is the label passed
- * to gpio_request(); otherwise it is a meaningless constant.
+ * The string returned is the label passed to gpio_request(); if none has been
+ * passed it is a meaningless, non-NULL constant.
  *
  * This function is for use by GPIO controller drivers.  The label can
  * help with diagnostics, and knowing that the signal is used as a GPIO
···
 
 	if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
 		return NULL;
-#ifdef CONFIG_DEBUG_FS
 	return desc->label;
-#else
-	return "?";
-#endif
 }
 EXPORT_SYMBOL_GPL(gpiochip_is_requested);
 
···
 
 	return __gpiod_request(desc, label);
 }
+EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
 
 /**
  * gpiochip_free_own_desc - Free GPIO requested by the chip driver
···
 	if (desc)
 		__gpiod_free(desc);
 }
+EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
 
 /* Drivers MUST set GPIO direction before making get/set calls.  In
  * some cases this is done in early boot, before IRQs are enabled.
···
  */
 int gpiod_direction_input(struct gpio_desc *desc)
 {
-	unsigned long		flags;
 	struct gpio_chip	*chip;
 	int			status = -EINVAL;
-	int			offset;
 
 	if (!desc || !desc->chip) {
 		pr_warn("%s: invalid GPIO\n", __func__);
···
 		return -EIO;
 	}
 
-	spin_lock_irqsave(&gpio_lock, flags);
-
-	status = gpio_ensure_requested(desc);
-	if (status < 0)
-		goto fail;
-
-	/* now we know the gpio is valid and chip won't vanish */
-
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-	might_sleep_if(chip->can_sleep);
-
-	offset = gpio_chip_hwgpio(desc);
-	if (status) {
-		status = chip->request(chip, offset);
-		if (status < 0) {
-			gpiod_dbg(desc, "%s: chip request fail, %d\n",
-					__func__, status);
-			/* and it's not available to anyone else ...
-			 * gpio_request() is the fully clean solution.
-			 */
-			goto lose;
-		}
-	}
-
-	status = chip->direction_input(chip, offset);
+	status = chip->direction_input(chip, gpio_chip_hwgpio(desc));
 	if (status == 0)
 		clear_bit(FLAG_IS_OUT, &desc->flags);
 
 	trace_gpio_direction(desc_to_gpio(desc), 1, status);
-lose:
-	return status;
-fail:
-	spin_unlock_irqrestore(&gpio_lock, flags);
-	if (status)
-		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+
 	return status;
 }
 EXPORT_SYMBOL_GPL(gpiod_direction_input);
 
 static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
 {
-	unsigned long		flags;
 	struct gpio_chip	*chip;
 	int			status = -EINVAL;
-	int offset;
 
 	/* GPIOs used for IRQs shall not be set as output */
 	if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
···
 		return -EIO;
 	}
 
-	spin_lock_irqsave(&gpio_lock, flags);
-
-	status = gpio_ensure_requested(desc);
-	if (status < 0)
-		goto fail;
-
-	/* now we know the gpio is valid and chip won't vanish */
-
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-	might_sleep_if(chip->can_sleep);
-
-	offset = gpio_chip_hwgpio(desc);
-	if (status) {
-		status = chip->request(chip, offset);
-		if (status < 0) {
-			gpiod_dbg(desc, "%s: chip request fail, %d\n",
-					__func__, status);
-			/* and it's not available to anyone else ...
-			 * gpio_request() is the fully clean solution.
-			 */
-			goto lose;
-		}
-	}
-
-	status = chip->direction_output(chip, offset, value);
+	status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value);
 	if (status == 0)
 		set_bit(FLAG_IS_OUT, &desc->flags);
 	trace_gpio_value(desc_to_gpio(desc), 0, value);
 	trace_gpio_direction(desc_to_gpio(desc), 0, status);
-lose:
-	return status;
-fail:
-	spin_unlock_irqrestore(&gpio_lock, flags);
-	if (status)
-		gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
 	return status;
 }
 
···
  */
 int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
 {
-	unsigned long		flags;
 	struct gpio_chip	*chip;
-	int			status = -EINVAL;
-	int			offset;
 
 	if (!desc || !desc->chip) {
 		pr_warn("%s: invalid GPIO\n", __func__);
···
 		return -ENOTSUPP;
 	}
 
-	spin_lock_irqsave(&gpio_lock, flags);
-
-	status = gpio_ensure_requested(desc);
-	if (status < 0)
-		goto fail;
-
-	/* now we know the gpio is valid and chip won't vanish */
-
-	spin_unlock_irqrestore(&gpio_lock, flags);
-
-	might_sleep_if(chip->can_sleep);
-
-	offset = gpio_chip_hwgpio(desc);
-	return chip->set_debounce(chip, offset, debounce);
-
-fail:
-	spin_unlock_irqrestore(&gpio_lock, flags);
-	if (status)
-		gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-
-	return status;
+	return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce);
 }
 EXPORT_SYMBOL_GPL(gpiod_set_debounce);
 
···
 EXPORT_SYMBOL_GPL(gpiod_to_irq);
 
 /**
- * gpiod_lock_as_irq() - lock a GPIO to be used as IRQ
- * @gpio: the GPIO line to lock as used for IRQ
+ * gpio_lock_as_irq() - lock a GPIO to be used as IRQ
+ * @chip: the chip the GPIO to lock belongs to
+ * @offset: the offset of the GPIO to lock as IRQ
  *
  * This is used directly by GPIO drivers that want to lock down
  * a certain GPIO line to be used for IRQs.
  */
-int gpiod_lock_as_irq(struct gpio_desc *desc)
+int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
 {
-	if (!desc)
+	if (offset >= chip->ngpio)
 		return -EINVAL;
 
-	if (test_bit(FLAG_IS_OUT, &desc->flags)) {
-		gpiod_err(desc,
+	if (test_bit(FLAG_IS_OUT, &chip->desc[offset].flags)) {
+		chip_err(chip,
 			  "%s: tried to flag a GPIO set as output for IRQ\n",
 			  __func__);
 		return -EIO;
 	}
 
-	set_bit(FLAG_USED_AS_IRQ, &desc->flags);
+	set_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
 	return 0;
-}
-EXPORT_SYMBOL_GPL(gpiod_lock_as_irq);
-
-int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
-{
-	return gpiod_lock_as_irq(gpiochip_get_desc(chip, offset));
 }
 EXPORT_SYMBOL_GPL(gpio_lock_as_irq);
 
 /**
- * gpiod_unlock_as_irq() - unlock a GPIO used as IRQ
- * @gpio: the GPIO line to unlock from IRQ usage
+ * gpio_unlock_as_irq() - unlock a GPIO used as IRQ
+ * @chip: the chip the GPIO to lock belongs to
+ * @offset: the offset of the GPIO to lock as IRQ
  *
  * This is used directly by GPIO drivers that want to indicate
  * that a certain GPIO is no longer used exclusively for IRQ.
  */
-void gpiod_unlock_as_irq(struct gpio_desc *desc)
-{
-	if (!desc)
-		return;
-
-	clear_bit(FLAG_USED_AS_IRQ, &desc->flags);
-}
-EXPORT_SYMBOL_GPL(gpiod_unlock_as_irq);
-
 void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
 {
-	return gpiod_unlock_as_irq(gpiochip_get_desc(chip, offset));
+	if (offset >= chip->ngpio)
+		return;
+
+	clear_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
 }
 EXPORT_SYMBOL_GPL(gpio_unlock_as_irq);
 
···
  * gpiod_get - obtain a GPIO for a given GPIO function
  * @dev:	GPIO consumer, can be NULL for system-global GPIOs
  * @con_id:	function within the GPIO consumer
+ * @flags:	optional GPIO initialization flags
  *
  * Return the GPIO descriptor corresponding to the function con_id of device
  * dev, -ENOENT if no GPIO has been assigned to the requested function, or
  * another IS_ERR() code if an error occured while trying to acquire the GPIO.
  */
-struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id)
+struct gpio_desc *__must_check __gpiod_get(struct device *dev, const char *con_id,
+					 enum gpiod_flags flags)
 {
-	return gpiod_get_index(dev, con_id, 0);
+	return gpiod_get_index(dev, con_id, 0, flags);
 }
-EXPORT_SYMBOL_GPL(gpiod_get);
+EXPORT_SYMBOL_GPL(__gpiod_get);
 
 /**
  * gpiod_get_optional - obtain an optional GPIO for a given GPIO function
  * @dev: GPIO consumer, can be NULL for system-global GPIOs
  * @con_id: function within the GPIO consumer
+ * @flags: optional GPIO initialization flags
  *
  * This is equivalent to gpiod_get(), except that when no GPIO was assigned to
  * the requested function it will return NULL. This is convenient for drivers
  * that need to handle optional GPIOs.
  */
-struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
-						  const char *con_id)
+struct gpio_desc *__must_check __gpiod_get_optional(struct device *dev,
+						  const char *con_id,
+						  enum gpiod_flags flags)
 {
-	return gpiod_get_index_optional(dev, con_id, 0);
+	return gpiod_get_index_optional(dev, con_id, 0, flags);
 }
-EXPORT_SYMBOL_GPL(gpiod_get_optional);
+EXPORT_SYMBOL_GPL(__gpiod_get_optional);
 
 /**
  * gpiod_get_index - obtain a GPIO from a multi-index GPIO function
  * @dev:	GPIO consumer, can be NULL for system-global GPIOs
  * @con_id:	function within the GPIO consumer
  * @idx:	index of the GPIO to obtain in the consumer
+ * @flags:	optional GPIO initialization flags
  *
  * This variant of gpiod_get() allows to access GPIOs other than the first
  * defined one for functions that define several GPIOs.
···
  * requested function and/or index, or another IS_ERR() code if an error
  * occured while trying to acquire the GPIO.
  */
-struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
+struct gpio_desc *__must_check __gpiod_get_index(struct device *dev,
 					       const char *con_id,
-					       unsigned int idx)
+					       unsigned int idx,
+					       enum gpiod_flags flags)
 {
 	struct gpio_desc *desc = NULL;
 	int status;
-	enum gpio_lookup_flags flags = 0;
+	enum gpio_lookup_flags lookupflags = 0;
 
 	dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
 
 	/* Using device tree? */
 	if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) {
 		dev_dbg(dev, "using device tree for GPIO lookup\n");
-		desc = of_find_gpio(dev, con_id, idx, &flags);
+		desc = of_find_gpio(dev, con_id, idx, &lookupflags);
 	} else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) {
 		dev_dbg(dev, "using ACPI for GPIO lookup\n");
-		desc = acpi_find_gpio(dev, con_id, idx, &flags);
+		desc = acpi_find_gpio(dev, con_id, idx, &lookupflags);
 	}
 
 	/*
···
 	 */
 	if (!desc || desc == ERR_PTR(-ENOENT)) {
 		dev_dbg(dev, "using lookup tables for GPIO lookup");
-		desc = gpiod_find(dev, con_id, idx, &flags);
+		desc = gpiod_find(dev, con_id, idx, &lookupflags);
 	}
 
 	if (IS_ERR(desc)) {
···
 	if (status < 0)
 		return ERR_PTR(status);
 
-	if (flags & GPIO_ACTIVE_LOW)
+	if (lookupflags & GPIO_ACTIVE_LOW)
 		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
-	if (flags & GPIO_OPEN_DRAIN)
+	if (lookupflags & GPIO_OPEN_DRAIN)
 		set_bit(FLAG_OPEN_DRAIN, &desc->flags);
-	if (flags & GPIO_OPEN_SOURCE)
+	if (lookupflags & GPIO_OPEN_SOURCE)
 		set_bit(FLAG_OPEN_SOURCE, &desc->flags);
+
+	/* No particular flag request, return here... */
+	if (flags & GPIOD_FLAGS_BIT_DIR_SET)
+		return desc;
+
+	/* Process flags */
+	if (flags & GPIOD_FLAGS_BIT_DIR_OUT)
+		status = gpiod_direction_output(desc,
+					      flags & GPIOD_FLAGS_BIT_DIR_VAL);
+	else
+		status = gpiod_direction_input(desc);
+
+	if (status < 0) {
+		dev_dbg(dev, "setup of GPIO %s failed\n", con_id);
+		gpiod_put(desc);
+		return ERR_PTR(status);
+	}
 
 	return desc;
 }
-EXPORT_SYMBOL_GPL(gpiod_get_index);
+EXPORT_SYMBOL_GPL(__gpiod_get_index);
 
 /**
  * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO
···
  * @dev: GPIO consumer, can be NULL for system-global GPIOs
  * @con_id: function within the GPIO consumer
  * @index: index of the GPIO to obtain in the consumer
+ * @flags: optional GPIO initialization flags
  *
  * This is equivalent to gpiod_get_index(), except that when no GPIO with the
  * specified index was assigned to the requested function it will return NULL.
  * This is convenient for drivers that need to handle optional GPIOs.
  */
-struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
+struct gpio_desc *__must_check __gpiod_get_index_optional(struct device *dev,
 							const char *con_id,
-							unsigned int index)
+							unsigned int index,
+							enum gpiod_flags flags)
 {
 	struct gpio_desc *desc;
 
-	desc = gpiod_get_index(dev, con_id, index);
+	desc = gpiod_get_index(dev, con_id, index, flags);
 	if (IS_ERR(desc)) {
 		if (PTR_ERR(desc) == -ENOENT)
 			return NULL;
···
 
 	return desc;
 }
-EXPORT_SYMBOL_GPL(gpiod_get_index_optional);
+EXPORT_SYMBOL_GPL(__gpiod_get_index_optional);
 
 /**
  * gpiod_put - dispose of a GPIO descriptor

drivers/gpio/gpiolib.h

···
 void acpi_gpiochip_add(struct gpio_chip *chip);
 void acpi_gpiochip_remove(struct gpio_chip *chip);
 
+void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
+
 struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
 					  struct acpi_gpio_info *info);
 #else
 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
+
+static inline void
+acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
+
+static inline void
+acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
 
 static inline struct gpio_desc *
 acpi_get_gpiod_by_index(struct device *dev, int index,
···
 }
 #endif
 
-int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
-void gpiochip_free_own_desc(struct gpio_desc *desc);
-
 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
 		   const char *list_name, int index, enum of_gpio_flags *flags);
+
+struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
+
+extern struct spinlock gpio_lock;
+extern struct list_head gpio_chips;
+
+struct gpio_desc {
+	struct gpio_chip	*chip;
+	unsigned long		flags;
+/* flag symbols are bit numbers */
+#define FLAG_REQUESTED	0
+#define FLAG_IS_OUT	1
+#define FLAG_EXPORT	2	/* protected by sysfs_lock */
+#define FLAG_SYSFS	3	/* exported via /sys/class/gpio/control */
+#define FLAG_TRIG_FALL	4	/* trigger on falling edge */
+#define FLAG_TRIG_RISE	5	/* trigger on rising edge */
+#define FLAG_ACTIVE_LOW	6	/* value has active low */
+#define FLAG_OPEN_DRAIN	7	/* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */
+#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */
+
+#define ID_SHIFT	16	/* add new flags before this one */
+
+#define GPIO_FLAGS_MASK		((1 << ID_SHIFT) - 1)
+#define GPIO_TRIGGER_MASK	(BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
+
+	const char		*label;
+};
+
+int gpiod_request(struct gpio_desc *desc, const char *label);
+void gpiod_free(struct gpio_desc *desc);
+
+/*
+ * Return the GPIO number of the passed descriptor relative to its chip
+ */
+static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
+{
+	return desc - &desc->chip->desc[0];
+}
+
+/* With descriptor prefix */
+
+#define gpiod_emerg(desc, fmt, ...)					       \
+	pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+		 ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)					       \
+	pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)					       \
+	pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
+		 ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)					       \
+	pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)					       \
+	pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)					       \
+	pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+		 ##__VA_ARGS__)
+
+/* With chip prefix */
+
+#define chip_emerg(chip, fmt, ...)					\
+	pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_crit(chip, fmt, ...)					\
+	pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_err(chip, fmt, ...)					\
+	pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_warn(chip, fmt, ...)					\
+	pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_info(chip, fmt, ...)					\
+	pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_dbg(chip, fmt, ...)					\
+	pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+
+#ifdef CONFIG_GPIO_SYSFS
+
+int gpiochip_export(struct gpio_chip *chip);
+void gpiochip_unexport(struct gpio_chip *chip);
+
+#else
+
+static inline int gpiochip_export(struct gpio_chip *chip)
+{
+	return 0;
+}
+
+static inline void gpiochip_unexport(struct gpio_chip *chip)
+{
+}
+
+#endif /* CONFIG_GPIO_SYSFS */
 
 #endif /* GPIOLIB_H */

include/asm-generic/gpio.h

···
 	return gpiod_to_irq(gpio_to_desc(gpio));
 }
 
-extern int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
-extern void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
-
 extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
 extern int gpio_request_array(const struct gpio *array, size_t num);
 extern void gpio_free_array(const struct gpio *array, size_t num);

include/linux/gpio/consumer.h

···
 
 #ifdef CONFIG_GPIOLIB
 
+#define GPIOD_FLAGS_BIT_DIR_SET		BIT(0)
+#define GPIOD_FLAGS_BIT_DIR_OUT		BIT(1)
+#define GPIOD_FLAGS_BIT_DIR_VAL		BIT(2)
+
+/**
+ * Optional flags that can be passed to one of gpiod_* to configure direction
+ * and output value. These values cannot be OR'd.
+ */
+enum gpiod_flags {
+	GPIOD_ASIS	= 0,
+	GPIOD_IN	= GPIOD_FLAGS_BIT_DIR_SET,
+	GPIOD_OUT_LOW	= GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
+	GPIOD_OUT_HIGH	= GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
+			  GPIOD_FLAGS_BIT_DIR_VAL,
+};
+
 /* Acquire and dispose GPIOs */
-struct gpio_desc *__must_check gpiod_get(struct device *dev,
-					 const char *con_id);
-struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
+struct gpio_desc *__must_check __gpiod_get(struct device *dev,
+					 const char *con_id,
+					 enum gpiod_flags flags);
+#define __gpiod_get(dev, con_id, flags, ...) __gpiod_get(dev, con_id, flags)
+#define gpiod_get(varargs...) __gpiod_get(varargs, 0)
+struct gpio_desc *__must_check __gpiod_get_index(struct device *dev,
 					       const char *con_id,
-					       unsigned int idx);
-struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
-						  const char *con_id);
-struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
+					       unsigned int idx,
+					       enum gpiod_flags flags);
+#define __gpiod_get_index(dev, con_id, index, flags, ...)		\
+	__gpiod_get_index(dev, con_id, index, flags)
+#define gpiod_get_index(varargs...) __gpiod_get_index(varargs, 0)
+struct gpio_desc *__must_check __gpiod_get_optional(struct device *dev,
+						  const char *con_id,
+						  enum gpiod_flags flags);
+#define __gpiod_get_optional(dev, con_id, flags, ...)			\
+	__gpiod_get_optional(dev, con_id, flags)
+#define gpiod_get_optional(varargs...) __gpiod_get_optional(varargs, 0)
+struct gpio_desc *__must_check __gpiod_get_index_optional(struct device *dev,
 							const char *con_id,
-							unsigned int index);
+							unsigned int index,
+							enum gpiod_flags flags);
+#define __gpiod_get_index_optional(dev, con_id, index, flags, ...)	\
+	__gpiod_get_index_optional(dev, con_id, index, flags)
+#define gpiod_get_index_optional(varargs...)				\
+	__gpiod_get_index_optional(varargs, 0)
 
 void gpiod_put(struct gpio_desc *desc);
 
-struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
-					      const char *con_id);
-struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
+struct gpio_desc *__must_check __devm_gpiod_get(struct device *dev,
+					      const char *con_id,
+					      enum gpiod_flags flags);
+#define __devm_gpiod_get(dev, con_id, flags, ...)			\
+	__devm_gpiod_get(dev, con_id, flags)
+#define devm_gpiod_get(varargs...) __devm_gpiod_get(varargs, 0)
+struct gpio_desc *__must_check __devm_gpiod_get_index(struct device *dev,
 						    const char *con_id,
-						    unsigned int idx);
-struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
-						       const char *con_id);
+						    unsigned int idx,
+						    enum gpiod_flags flags);
+#define __devm_gpiod_get_index(dev, con_id, index, flags, ...)		\
+	__devm_gpiod_get_index(dev, con_id, index, flags)
+#define devm_gpiod_get_index(varargs...) __devm_gpiod_get_index(varargs, 0)
+struct gpio_desc *__must_check __devm_gpiod_get_optional(struct device *dev,
+						       const char *con_id,
+						       enum gpiod_flags flags);
+#define __devm_gpiod_get_optional(dev, con_id, flags, ...)		\
+	__devm_gpiod_get_optional(dev, con_id, flags)
+#define devm_gpiod_get_optional(varargs...)				\
+	__devm_gpiod_get_optional(varargs, 0)
 struct gpio_desc *__must_check
-devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
-			      unsigned int index);
+__devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
+			      unsigned int index, enum gpiod_flags flags);
+#define __devm_gpiod_get_index_optional(dev, con_id, index, flags, ...)	\
+	__devm_gpiod_get_index_optional(dev, con_id, index, flags)
+#define devm_gpiod_get_index_optional(varargs...)			\
+	__devm_gpiod_get_index_optional(varargs, 0)
 
 void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
 

include/linux/gpio/driver.h

···
 
 /* add/remove chips */
 extern int gpiochip_add(struct gpio_chip *chip);
-extern int __must_check gpiochip_remove(struct gpio_chip *chip);
+extern int gpiochip_remove(struct gpio_chip *chip);
 extern struct gpio_chip *gpiochip_find(void *data,
 			      int (*match)(struct gpio_chip *chip, void *data));
 
 /* lock/unlock as IRQ */
-int gpiod_lock_as_irq(struct gpio_desc *desc);
-void gpiod_unlock_as_irq(struct gpio_desc *desc);
+int gpio_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
+void gpio_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
 
 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
-
-struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
-				    u16 hwnum);
-
-enum gpio_lookup_flags {
-	GPIO_ACTIVE_HIGH = (0 << 0),
-	GPIO_ACTIVE_LOW = (1 << 0),
-	GPIO_OPEN_DRAIN = (1 << 1),
-	GPIO_OPEN_SOURCE = (1 << 2),
-};
-
-/**
- * struct gpiod_lookup - lookup table
- * @chip_label: name of the chip the GPIO belongs to
- * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
- * @con_id: name of the GPIO from the device's point of view
- * @idx: index of the GPIO in case several GPIOs share the same name
- * @flags: mask of GPIO_* values
- *
- * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
- * functions using platform data.
- */
-struct gpiod_lookup {
-	const char *chip_label;
-	u16 chip_hwnum;
-	const char *con_id;
-	unsigned int idx;
-	enum gpio_lookup_flags flags;
-};
-
-struct gpiod_lookup_table {
-	struct list_head list;
-	const char *dev_id;
-	struct gpiod_lookup table[];
-};
-
-/*
- * Simple definition of a single GPIO under a con_id
- */
-#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
-	GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
-
-/*
- * Use this macro if you need to have several GPIOs under the same con_id.
- * Each GPIO needs to use a different index and can be accessed using
- * gpiod_get_index()
- */
-#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags)  \
-{                                                                         \
-	.chip_label = _chip_label,                                        \
-	.chip_hwnum = _chip_hwnum,                                        \
-	.con_id = _con_id,                                                \
-	.idx = _idx,                                                      \
-	.flags = _flags,                                                  \
-}
-
-void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
 
 #ifdef CONFIG_GPIOLIB_IRQCHIP
 
···
 		unsigned int type);
 
 #endif /* CONFIG_GPIO_IRQCHIP */
+
+int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
+void gpiochip_free_own_desc(struct gpio_desc *desc);
 
 #else /* CONFIG_GPIOLIB */
 

include/linux/gpio/machine.h

···
+#ifndef __LINUX_GPIO_MACHINE_H
+#define __LINUX_GPIO_MACHINE_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+enum gpio_lookup_flags {
+	GPIO_ACTIVE_HIGH = (0 << 0),
+	GPIO_ACTIVE_LOW = (1 << 0),
+	GPIO_OPEN_DRAIN = (1 << 1),
+	GPIO_OPEN_SOURCE = (1 << 2),
+};
+
+/**
+ * struct gpiod_lookup - lookup table
+ * @chip_label: name of the chip the GPIO belongs to
+ * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
+ * @con_id: name of the GPIO from the device's point of view
+ * @idx: index of the GPIO in case several GPIOs share the same name
+ * @flags: mask of GPIO_* values
+ *
+ * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
+ * functions using platform data.
+ */
+struct gpiod_lookup {
+	const char *chip_label;
+	u16 chip_hwnum;
+	const char *con_id;
+	unsigned int idx;
+	enum gpio_lookup_flags flags;
+};
+
+struct gpiod_lookup_table {
+	struct list_head list;
+	const char *dev_id;
+	struct gpiod_lookup table[];
+};
+
+/*
+ * Simple definition of a single GPIO under a con_id
+ */
+#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
+	GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
+
+/*
+ * Use this macro if you need to have several GPIOs under the same con_id.
+ * Each GPIO needs to use a different index and can be accessed using
+ * gpiod_get_index()
+ */
+#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags)  \
+{                                                                         \
+	.chip_label = _chip_label,                                        \
+	.chip_hwnum = _chip_hwnum,                                        \
+	.con_id = _con_id,                                                \
+	.idx = _idx,                                                      \
+	.flags = _flags,                                                  \
+}
+
+void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
+
+#endif /* __LINUX_GPIO_MACHINE_H */