pinctrl: samsung: Remove support for Exynos5440

The Exynos5440 is not actively developed, there are no development
boards available and probably there are no real products with it.
Remove wide-tree support for Exynos5440.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Chanwoo Choi <[e-mail]>

drivers/pinctrl/samsung/Kconfig

···
 	select PINCONF
 
 config PINCTRL_EXYNOS
-	bool "Pinctrl driver data for Samsung EXYNOS SoCs other than 5440"
+	bool "Pinctrl driver data for Samsung EXYNOS SoCs"
 	depends on OF && GPIOLIB && (ARCH_EXYNOS || ARCH_S5PV210)
 	select PINCTRL_SAMSUNG
 	select PINCTRL_EXYNOS_ARM if ARM && (ARCH_EXYNOS || ARCH_S5PV210)
 	select PINCTRL_EXYNOS_ARM64 if ARM64 && ARCH_EXYNOS
 
 config PINCTRL_EXYNOS_ARM
-	bool "ARMv7-specific pinctrl driver data for Exynos (except Exynos5440)" if COMPILE_TEST
+	bool "ARMv7-specific pinctrl driver data for Exynos" if COMPILE_TEST
 	depends on PINCTRL_EXYNOS
 
 config PINCTRL_EXYNOS_ARM64
 	bool "ARMv8-specific pinctrl driver data for Exynos" if COMPILE_TEST
 	depends on PINCTRL_EXYNOS
-
-config PINCTRL_EXYNOS5440
-	bool "Samsung EXYNOS5440 SoC pinctrl driver"
-	depends on SOC_EXYNOS5440
-	select PINMUX
-	select PINCONF
 
 config PINCTRL_S3C24XX
 	bool "Samsung S3C24XX SoC pinctrl driver"

drivers/pinctrl/samsung/Makefile

···
 obj-$(CONFIG_PINCTRL_EXYNOS)	+= pinctrl-exynos.o
 obj-$(CONFIG_PINCTRL_EXYNOS_ARM)	+= pinctrl-exynos-arm.o
 obj-$(CONFIG_PINCTRL_EXYNOS_ARM64)	+= pinctrl-exynos-arm64.o
-obj-$(CONFIG_PINCTRL_EXYNOS5440)	+= pinctrl-exynos5440.o
 obj-$(CONFIG_PINCTRL_S3C24XX)	+= pinctrl-s3c24xx.o
 obj-$(CONFIG_PINCTRL_S3C64XX)	+= pinctrl-s3c64xx.o

drivers/pinctrl/samsung/pinctrl-exynos5440.c

···
-// SPDX-License-Identifier: GPL-2.0+
-//
-// pin-controller/pin-mux/pin-config/gpio-driver for Samsung's EXYNOS5440 SoC.
-//
-// Author: Thomas Abraham <[e-mail]>
-//
-// Copyright (c) 2012 Samsung Electronics Co., Ltd.
-//		http://www.samsung.com
-
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/gpio/driver.h>
-#include <linux/device.h>
-#include <linux/pinctrl/pinctrl.h>
-#include <linux/pinctrl/pinmux.h>
-#include <linux/pinctrl/pinconf.h>
-#include <linux/interrupt.h>
-#include <linux/irqdomain.h>
-#include <linux/of_irq.h>
-#include "../core.h"
-
-/* EXYNOS5440 GPIO and Pinctrl register offsets */
-#define GPIO_MUX		0x00
-#define GPIO_IE			0x04
-#define GPIO_INT		0x08
-#define GPIO_TYPE		0x0C
-#define GPIO_VAL		0x10
-#define GPIO_OE			0x14
-#define GPIO_IN			0x18
-#define GPIO_PE			0x1C
-#define GPIO_PS			0x20
-#define GPIO_SR			0x24
-#define GPIO_DS0		0x28
-#define GPIO_DS1		0x2C
-
-#define EXYNOS5440_MAX_PINS		23
-#define EXYNOS5440_MAX_GPIO_INT	8
-#define PIN_NAME_LENGTH		10
-
-#define GROUP_SUFFIX		"-grp"
-#define FUNCTION_SUFFIX		"-mux"
-
-/*
- * pin configuration type and its value are packed together into a 16-bits.
- * The upper 8-bits represent the configuration type and the lower 8-bits
- * hold the value of the configuration type.
- */
-#define PINCFG_TYPE_MASK		0xFF
-#define PINCFG_VALUE_SHIFT		8
-#define PINCFG_VALUE_MASK		(0xFF << PINCFG_VALUE_SHIFT)
-#define PINCFG_PACK(type, value)	(((value) << PINCFG_VALUE_SHIFT) | type)
-#define PINCFG_UNPACK_TYPE(cfg)		((cfg) & PINCFG_TYPE_MASK)
-#define PINCFG_UNPACK_VALUE(cfg)	(((cfg) & PINCFG_VALUE_MASK) >> \
-						PINCFG_VALUE_SHIFT)
-
-/**
- * enum pincfg_type - possible pin configuration types supported.
- * @PINCFG_TYPE_PUD: Pull up/down configuration.
- * @PINCFG_TYPE_DRV: Drive strength configuration.
- * @PINCFG_TYPE_SKEW_RATE: Skew rate configuration.
- * @PINCFG_TYPE_INPUT_TYPE: Pin input type configuration.
- */
-enum pincfg_type {
-	PINCFG_TYPE_PUD,
-	PINCFG_TYPE_DRV,
-	PINCFG_TYPE_SKEW_RATE,
-	PINCFG_TYPE_INPUT_TYPE
-};
-
-/**
- * struct exynos5440_pin_group: represent group of pins for pincfg setting.
- * @name: name of the pin group, used to lookup the group.
- * @pins: the pins included in this group.
- * @num_pins: number of pins included in this group.
- */
-struct exynos5440_pin_group {
-	const char		*name;
-	const unsigned int	*pins;
-	u8			num_pins;
-};
-
-/**
- * struct exynos5440_pmx_func: represent a pin function.
- * @name: name of the pin function, used to lookup the function.
- * @groups: one or more names of pin groups that provide this function.
- * @num_groups: number of groups included in @groups.
- * @function: the function number to be programmed when selected.
- */
-struct exynos5440_pmx_func {
-	const char		*name;
-	const char		**groups;
-	u8			num_groups;
-	unsigned long		function;
-};
-
-/**
- * struct exynos5440_pinctrl_priv_data: driver's private runtime data.
- * @reg_base: ioremapped based address of the register space.
- * @gc: gpio chip registered with gpiolib.
- * @pin_groups: list of pin groups parsed from device tree.
- * @nr_groups: number of pin groups available.
- * @pmx_functions: list of pin functions parsed from device tree.
- * @nr_functions: number of pin functions available.
- * @range: gpio range to register with pinctrl
- */
-struct exynos5440_pinctrl_priv_data {
-	void __iomem			*reg_base;
-	struct gpio_chip		*gc;
-	struct irq_domain		*irq_domain;
-
-	const struct exynos5440_pin_group	*pin_groups;
-	unsigned int			nr_groups;
-	const struct exynos5440_pmx_func	*pmx_functions;
-	unsigned int			nr_functions;
-	struct pinctrl_gpio_range	range;
-};
-
-/**
- * struct exynos5440_gpio_intr_data: private data for gpio interrupts.
- * @priv: driver's private runtime data.
- * @gpio_int: gpio interrupt number.
- */
-struct exynos5440_gpio_intr_data {
-	struct exynos5440_pinctrl_priv_data	*priv;
-	unsigned int				gpio_int;
-};
-
-/* list of all possible config options supported */
-static struct pin_config {
-	char		*prop_cfg;
-	unsigned int	cfg_type;
-} pcfgs[] = {
-	{ "samsung,exynos5440-pin-pud", PINCFG_TYPE_PUD },
-	{ "samsung,exynos5440-pin-drv", PINCFG_TYPE_DRV },
-	{ "samsung,exynos5440-pin-skew-rate", PINCFG_TYPE_SKEW_RATE },
-	{ "samsung,exynos5440-pin-input-type", PINCFG_TYPE_INPUT_TYPE },
-};
-
-/* check if the selector is a valid pin group selector */
-static int exynos5440_get_group_count(struct pinctrl_dev *pctldev)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	return priv->nr_groups;
-}
-
-/* return the name of the group selected by the group selector */
-static const char *exynos5440_get_group_name(struct pinctrl_dev *pctldev,
-						unsigned selector)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	return priv->pin_groups[selector].name;
-}
-
-/* return the pin numbers associated with the specified group */
-static int exynos5440_get_group_pins(struct pinctrl_dev *pctldev,
-		unsigned selector, const unsigned **pins, unsigned *num_pins)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	*pins = priv->pin_groups[selector].pins;
-	*num_pins = priv->pin_groups[selector].num_pins;
-	return 0;
-}
-
-/* create pinctrl_map entries by parsing device tree nodes */
-static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
-			struct device_node *np, struct pinctrl_map **maps,
-			unsigned *nmaps)
-{
-	struct device *dev = pctldev->dev;
-	struct pinctrl_map *map;
-	unsigned long *cfg = NULL;
-	char *gname, *fname;
-	int cfg_cnt = 0, map_cnt = 0, idx = 0;
-
-	/* count the number of config options specfied in the node */
-	for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++)
-		if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
-			cfg_cnt++;
-
-	/*
-	 * Find out the number of map entries to create. All the config options
-	 * can be accomadated into a single config map entry.
-	 */
-	if (cfg_cnt)
-		map_cnt = 1;
-	if (of_find_property(np, "samsung,exynos5440-pin-function", NULL))
-		map_cnt++;
-	if (!map_cnt) {
-		dev_err(dev, "node %s does not have either config or function "
-				"configurations\n", np->name);
-		return -EINVAL;
-	}
-
-	/* Allocate memory for pin-map entries */
-	map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
-	if (!map)
-		return -ENOMEM;
-	*nmaps = 0;
-
-	/*
-	 * Allocate memory for pin group name. The pin group name is derived
-	 * from the node name from which these map entries are be created.
-	 */
-	gname = kasprintf(GFP_KERNEL, "%s%s", np->name, GROUP_SUFFIX);
-	if (!gname)
-		goto free_map;
-
-	/*
-	 * don't have config options? then skip over to creating function
-	 * map entries.
-	 */
-	if (!cfg_cnt)
-		goto skip_cfgs;
-
-	/* Allocate memory for config entries */
-	cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
-	if (!cfg)
-		goto free_gname;
-
-	/* Prepare a list of config settings */
-	for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
-		u32 value;
-		if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
-			cfg[cfg_cnt++] =
-				PINCFG_PACK(pcfgs[idx].cfg_type, value);
-	}
-
-	/* create the config map entry */
-	map[*nmaps].data.configs.group_or_pin = gname;
-	map[*nmaps].data.configs.configs = cfg;
-	map[*nmaps].data.configs.num_configs = cfg_cnt;
-	map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
-	*nmaps += 1;
-
-skip_cfgs:
-	/* create the function map entry */
-	if (of_find_property(np, "samsung,exynos5440-pin-function", NULL)) {
-		fname = kasprintf(GFP_KERNEL,
-				  "%s%s", np->name, FUNCTION_SUFFIX);
-		if (!fname)
-			goto free_cfg;
-
-		map[*nmaps].data.mux.group = gname;
-		map[*nmaps].data.mux.function = fname;
-		map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
-		*nmaps += 1;
-	}
-
-	*maps = map;
-	return 0;
-
-free_cfg:
-	kfree(cfg);
-free_gname:
-	kfree(gname);
-free_map:
-	kfree(map);
-	return -ENOMEM;
-}
-
-/* free the memory allocated to hold the pin-map table */
-static void exynos5440_dt_free_map(struct pinctrl_dev *pctldev,
-			     struct pinctrl_map *map, unsigned num_maps)
-{
-	int idx;
-
-	for (idx = 0; idx < num_maps; idx++) {
-		if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
-			kfree(map[idx].data.mux.function);
-			if (!idx)
-				kfree(map[idx].data.mux.group);
-		} else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
-			kfree(map[idx].data.configs.configs);
-			if (!idx)
-				kfree(map[idx].data.configs.group_or_pin);
-		}
-	}
-
-	kfree(map);
-}
-
-/* list of pinctrl callbacks for the pinctrl core */
-static const struct pinctrl_ops exynos5440_pctrl_ops = {
-	.get_groups_count	= exynos5440_get_group_count,
-	.get_group_name		= exynos5440_get_group_name,
-	.get_group_pins		= exynos5440_get_group_pins,
-	.dt_node_to_map		= exynos5440_dt_node_to_map,
-	.dt_free_map		= exynos5440_dt_free_map,
-};
-
-/* check if the selector is a valid pin function selector */
-static int exynos5440_get_functions_count(struct pinctrl_dev *pctldev)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	return priv->nr_functions;
-}
-
-/* return the name of the pin function specified */
-static const char *exynos5440_pinmux_get_fname(struct pinctrl_dev *pctldev,
-						unsigned selector)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	return priv->pmx_functions[selector].name;
-}
-
-/* return the groups associated for the specified function selector */
-static int exynos5440_pinmux_get_groups(struct pinctrl_dev *pctldev,
-		unsigned selector, const char * const **groups,
-		unsigned * const num_groups)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	*groups = priv->pmx_functions[selector].groups;
-	*num_groups = priv->pmx_functions[selector].num_groups;
-	return 0;
-}
-
-/* enable or disable a pinmux function */
-static void exynos5440_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
-					unsigned group, bool enable)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-	void __iomem *base;
-	u32 function;
-	u32 data;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	base = priv->reg_base;
-	function = priv->pmx_functions[selector].function;
-
-	data = readl(base + GPIO_MUX);
-	if (enable)
-		data |= (1 << function);
-	else
-		data &= ~(1 << function);
-	writel(data, base + GPIO_MUX);
-}
-
-/* enable a specified pinmux by writing to registers */
-static int exynos5440_pinmux_set_mux(struct pinctrl_dev *pctldev,
-				     unsigned selector,
-				     unsigned group)
-{
-	exynos5440_pinmux_setup(pctldev, selector, group, true);
-	return 0;
-}
-
-/*
- * The calls to gpio_direction_output() and gpio_direction_input()
- * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
- * function called from the gpiolib interface).
- */
-static int exynos5440_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
-		struct pinctrl_gpio_range *range, unsigned offset, bool input)
-{
-	return 0;
-}
-
-/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
-static const struct pinmux_ops exynos5440_pinmux_ops = {
-	.get_functions_count	= exynos5440_get_functions_count,
-	.get_function_name	= exynos5440_pinmux_get_fname,
-	.get_function_groups	= exynos5440_pinmux_get_groups,
-	.set_mux		= exynos5440_pinmux_set_mux,
-	.gpio_set_direction	= exynos5440_pinmux_gpio_set_direction,
-};
-
-/* set the pin config settings for a specified pin */
-static int exynos5440_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
-				unsigned long *configs,
-				unsigned num_configs)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-	void __iomem *base;
-	enum pincfg_type cfg_type;
-	u32 cfg_value;
-	u32 data;
-	int i;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	base = priv->reg_base;
-
-	for (i = 0; i < num_configs; i++) {
-		cfg_type = PINCFG_UNPACK_TYPE(configs[i]);
-		cfg_value = PINCFG_UNPACK_VALUE(configs[i]);
-
-		switch (cfg_type) {
-		case PINCFG_TYPE_PUD:
-			/* first set pull enable/disable bit */
-			data = readl(base + GPIO_PE);
-			data &= ~(1 << pin);
-			if (cfg_value)
-				data |= (1 << pin);
-			writel(data, base + GPIO_PE);
-
-			/* then set pull up/down bit */
-			data = readl(base + GPIO_PS);
-			data &= ~(1 << pin);
-			if (cfg_value == 2)
-				data |= (1 << pin);
-			writel(data, base + GPIO_PS);
-			break;
-
-		case PINCFG_TYPE_DRV:
-			/* set the first bit of the drive strength */
-			data = readl(base + GPIO_DS0);
-			data &= ~(1 << pin);
-			data |= ((cfg_value & 1) << pin);
-			writel(data, base + GPIO_DS0);
-			cfg_value >>= 1;
-
-			/* set the second bit of the driver strength */
-			data = readl(base + GPIO_DS1);
-			data &= ~(1 << pin);
-			data |= ((cfg_value & 1) << pin);
-			writel(data, base + GPIO_DS1);
-			break;
-		case PINCFG_TYPE_SKEW_RATE:
-			data = readl(base + GPIO_SR);
-			data &= ~(1 << pin);
-			data |= ((cfg_value & 1) << pin);
-			writel(data, base + GPIO_SR);
-			break;
-		case PINCFG_TYPE_INPUT_TYPE:
-			data = readl(base + GPIO_TYPE);
-			data &= ~(1 << pin);
-			data |= ((cfg_value & 1) << pin);
-			writel(data, base + GPIO_TYPE);
-			break;
-		default:
-			WARN_ON(1);
-			return -EINVAL;
-		}
-	} /* for each config */
-
-	return 0;
-}
-
-/* get the pin config settings for a specified pin */
-static int exynos5440_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
-					unsigned long *config)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-	void __iomem *base;
-	enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
-	u32 data;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	base = priv->reg_base;
-
-	switch (cfg_type) {
-	case PINCFG_TYPE_PUD:
-		data = readl(base + GPIO_PE);
-		data = (data >> pin) & 1;
-		if (!data)
-			*config = 0;
-		else
-			*config = ((readl(base + GPIO_PS) >> pin) & 1) + 1;
-		break;
-	case PINCFG_TYPE_DRV:
-		data = readl(base + GPIO_DS0);
-		data = (data >> pin) & 1;
-		*config = data;
-		data = readl(base + GPIO_DS1);
-		data = (data >> pin) & 1;
-		*config |= (data << 1);
-		break;
-	case PINCFG_TYPE_SKEW_RATE:
-		data = readl(base + GPIO_SR);
-		*config = (data >> pin) & 1;
-		break;
-	case PINCFG_TYPE_INPUT_TYPE:
-		data = readl(base + GPIO_TYPE);
-		*config = (data >> pin) & 1;
-		break;
-	default:
-		WARN_ON(1);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/* set the pin config settings for a specified pin group */
-static int exynos5440_pinconf_group_set(struct pinctrl_dev *pctldev,
-			unsigned group, unsigned long *configs,
-			unsigned num_configs)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-	const unsigned int *pins;
-	unsigned int cnt;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	pins = priv->pin_groups[group].pins;
-
-	for (cnt = 0; cnt < priv->pin_groups[group].num_pins; cnt++)
-		exynos5440_pinconf_set(pctldev, pins[cnt], configs,
-				       num_configs);
-
-	return 0;
-}
-
-/* get the pin config settings for a specified pin group */
-static int exynos5440_pinconf_group_get(struct pinctrl_dev *pctldev,
-				unsigned int group, unsigned long *config)
-{
-	struct exynos5440_pinctrl_priv_data *priv;
-	const unsigned int *pins;
-
-	priv = pinctrl_dev_get_drvdata(pctldev);
-	pins = priv->pin_groups[group].pins;
-	exynos5440_pinconf_get(pctldev, pins[0], config);
-	return 0;
-}
-
-/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
-static const struct pinconf_ops exynos5440_pinconf_ops = {
-	.pin_config_get		= exynos5440_pinconf_get,
-	.pin_config_set		= exynos5440_pinconf_set,
-	.pin_config_group_get	= exynos5440_pinconf_group_get,
-	.pin_config_group_set	= exynos5440_pinconf_group_set,
-};
-
-/* gpiolib gpio_set callback function */
-static void exynos5440_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
-{
-	struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
-	void __iomem *base = priv->reg_base;
-	u32 data;
-
-	data = readl(base + GPIO_VAL);
-	data &= ~(1 << offset);
-	if (value)
-		data |= 1 << offset;
-	writel(data, base + GPIO_VAL);
-}
-
-/* gpiolib gpio_get callback function */
-static int exynos5440_gpio_get(struct gpio_chip *gc, unsigned offset)
-{
-	struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
-	void __iomem *base = priv->reg_base;
-	u32 data;
-
-	data = readl(base + GPIO_IN);
-	data >>= offset;
-	data &= 1;
-	return data;
-}
-
-/* gpiolib gpio_direction_input callback function */
-static int exynos5440_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
-{
-	struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
-	void __iomem *base = priv->reg_base;
-	u32 data;
-
-	/* first disable the data output enable on this pin */
-	data = readl(base + GPIO_OE);
-	data &= ~(1 << offset);
-	writel(data, base + GPIO_OE);
-
-	/* now enable input on this pin */
-	data =  readl(base + GPIO_IE);
-	data |= 1 << offset;
-	writel(data, base + GPIO_IE);
-	return 0;
-}
-
-/* gpiolib gpio_direction_output callback function */
-static int exynos5440_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
-							int value)
-{
-	struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
-	void __iomem *base = priv->reg_base;
-	u32 data;
-
-	exynos5440_gpio_set(gc, offset, value);
-
-	/* first disable the data input enable on this pin */
-	data = readl(base + GPIO_IE);
-	data &= ~(1 << offset);
-	writel(data, base + GPIO_IE);
-
-	/* now enable output on this pin */
-	data =  readl(base + GPIO_OE);
-	data |= 1 << offset;
-	writel(data, base + GPIO_OE);
-	return 0;
-}
-
-/* gpiolib gpio_to_irq callback function */
-static int exynos5440_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
-{
-	struct exynos5440_pinctrl_priv_data *priv = gpiochip_get_data(gc);
-	unsigned int virq;
-
-	if (offset < 16 || offset > 23)
-		return -ENXIO;
-
-	if (!priv->irq_domain)
-		return -ENXIO;
-
-	virq = irq_create_mapping(priv->irq_domain, offset - 16);
-	return virq ? : -ENXIO;
-}
-
-/* parse the pin numbers listed in the 'samsung,exynos5440-pins' property */
-static int exynos5440_pinctrl_parse_dt_pins(struct platform_device *pdev,
-			struct device_node *cfg_np, unsigned int **pin_list,
-			unsigned int *npins)
-{
-	struct device *dev = &pdev->dev;
-	struct property *prop;
-
-	prop = of_find_property(cfg_np, "samsung,exynos5440-pins", NULL);
-	if (!prop)
-		return -ENOENT;
-
-	*npins = prop->length / sizeof(unsigned long);
-	if (!*npins) {
-		dev_err(dev, "invalid pin list in %s node", cfg_np->name);
-		return -EINVAL;
-	}
-
-	*pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
-	if (!*pin_list)
-		return -ENOMEM;
-
-	return of_property_read_u32_array(cfg_np, "samsung,exynos5440-pins",
-			*pin_list, *npins);
-}
-
-/*
- * Parse the information about all the available pin groups and pin functions
- * from device node of the pin-controller.
- */
-static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
-				struct exynos5440_pinctrl_priv_data *priv)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *dev_np = dev->of_node;
-	struct device_node *cfg_np;
-	struct exynos5440_pin_group *groups, *grp;
-	struct exynos5440_pmx_func *functions, *func;
-	unsigned *pin_list;
-	unsigned int npins, grp_cnt, func_idx = 0;
-	char *gname, *fname;
-	int ret;
-
-	grp_cnt = of_get_child_count(dev_np);
-	if (!grp_cnt)
-		return -EINVAL;
-
-	groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
-	if (!groups)
-		return -EINVAL;
-
-	grp = groups;
-
-	functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
-	if (!functions)
-		return -EINVAL;
-
-	func = functions;
-
-	/*
-	 * Iterate over all the child nodes of the pin controller node
-	 * and create pin groups and pin function lists.
-	 */
-	for_each_child_of_node(dev_np, cfg_np) {
-		u32 function;
-
-		ret = exynos5440_pinctrl_parse_dt_pins(pdev, cfg_np,
-					&pin_list, &npins);
-		if (ret) {
-			gname = NULL;
-			goto skip_to_pin_function;
-		}
-
-		/* derive pin group name from the node name */
-		gname = devm_kasprintf(dev, GFP_KERNEL,
-				       "%s%s", cfg_np->name, GROUP_SUFFIX);
-		if (!gname)
-			return -ENOMEM;
-
-		grp->name = gname;
-		grp->pins = pin_list;
-		grp->num_pins = npins;
-		grp++;
-
-skip_to_pin_function:
-		ret = of_property_read_u32(cfg_np, "samsung,exynos5440-pin-function",
-						&function);
-		if (ret)
-			continue;
-
-		/* derive function name from the node name */
-		fname = devm_kasprintf(dev, GFP_KERNEL,
-				       "%s%s", cfg_np->name, FUNCTION_SUFFIX);
-		if (!fname)
-			return -ENOMEM;
-
-		func->name = fname;
-		func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
-		if (!func->groups)
-			return -ENOMEM;
-		func->groups[0] = gname;
-		func->num_groups = gname ? 1 : 0;
-		func->function = function;
-		func++;
-		func_idx++;
-	}
-
-	priv->pin_groups = groups;
-	priv->nr_groups = grp_cnt;
-	priv->pmx_functions = functions;
-	priv->nr_functions = func_idx;
-	return 0;
-}
-
-/* register the pinctrl interface with the pinctrl subsystem */
-static int exynos5440_pinctrl_register(struct platform_device *pdev,
-				struct exynos5440_pinctrl_priv_data *priv)
-{
-	struct device *dev = &pdev->dev;
-	struct pinctrl_desc *ctrldesc;
-	struct pinctrl_dev *pctl_dev;
-	struct pinctrl_pin_desc *pindesc, *pdesc;
-	char *pin_names;
-	int pin, ret;
-
-	ctrldesc = devm_kzalloc(dev, sizeof(*ctrldesc), GFP_KERNEL);
-	if (!ctrldesc)
-		return -ENOMEM;
-
-	ctrldesc->name = "exynos5440-pinctrl";
-	ctrldesc->owner = THIS_MODULE;
-	ctrldesc->pctlops = &exynos5440_pctrl_ops;
-	ctrldesc->pmxops = &exynos5440_pinmux_ops;
-	ctrldesc->confops = &exynos5440_pinconf_ops;
-
-	pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
-				EXYNOS5440_MAX_PINS, GFP_KERNEL);
-	if (!pindesc)
-		return -ENOMEM;
-	ctrldesc->pins = pindesc;
-	ctrldesc->npins = EXYNOS5440_MAX_PINS;
-
-	/* dynamically populate the pin number and pin name for pindesc */
-	for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
-		pdesc->number = pin;
-
-	/*
-	 * allocate space for storing the dynamically generated names for all
-	 * the pins which belong to this pin-controller.
-	 */
-	pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
-					ctrldesc->npins, GFP_KERNEL);
-	if (!pin_names)
-		return -ENOMEM;
-
-	/* for each pin, set the name of the pin */
-	for (pin = 0; pin < ctrldesc->npins; pin++) {
-		snprintf(pin_names, 6, "gpio%02d", pin);
-		pdesc = pindesc + pin;
-		pdesc->name = pin_names;
-		pin_names += PIN_NAME_LENGTH;
-	}
-
-	ret = exynos5440_pinctrl_parse_dt(pdev, priv);
-	if (ret)
-		return ret;
-
-	pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, priv);
-	if (IS_ERR(pctl_dev)) {
-		dev_err(&pdev->dev, "could not register pinctrl driver\n");
-		return PTR_ERR(pctl_dev);
-	}
-
-	priv->range.name = "exynos5440-pctrl-gpio-range";
-	priv->range.id = 0;
-	priv->range.base = 0;
-	priv->range.npins = EXYNOS5440_MAX_PINS;
-	priv->range.gc = priv->gc;
-	pinctrl_add_gpio_range(pctl_dev, &priv->range);
-	return 0;
-}
-
-/* register the gpiolib interface with the gpiolib subsystem */
-static int exynos5440_gpiolib_register(struct platform_device *pdev,
-				struct exynos5440_pinctrl_priv_data *priv)
-{
-	struct gpio_chip *gc;
-	int ret;
-
-	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
-	if (!gc)
-		return -ENOMEM;
-
-	priv->gc = gc;
-	gc->base = 0;
-	gc->ngpio = EXYNOS5440_MAX_PINS;
-	gc->parent = &pdev->dev;
-	gc->set = exynos5440_gpio_set;
-	gc->get = exynos5440_gpio_get;
-	gc->direction_input = exynos5440_gpio_direction_input;
-	gc->direction_output = exynos5440_gpio_direction_output;
-	gc->to_irq = exynos5440_gpio_to_irq;
-	gc->label = "gpiolib-exynos5440";
-	gc->owner = THIS_MODULE;
-	ret = gpiochip_add_data(gc, priv);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
-					"code: %d\n", gc->label, ret);
-		return ret;
-	}
-
-	return 0;
-}
-
-/* unregister the gpiolib interface with the gpiolib subsystem */
-static int exynos5440_gpiolib_unregister(struct platform_device *pdev,
-				struct exynos5440_pinctrl_priv_data *priv)
-{
-	gpiochip_remove(priv->gc);
-	return 0;
-}
-
-static void exynos5440_gpio_irq_unmask(struct irq_data *irqd)
-{
-	struct exynos5440_pinctrl_priv_data *d;
-	unsigned long gpio_int;
-
-	d = irq_data_get_irq_chip_data(irqd);
-	gpio_int = readl(d->reg_base + GPIO_INT);
-	gpio_int |= 1 << irqd->hwirq;
-	writel(gpio_int, d->reg_base + GPIO_INT);
-}
-
-static void exynos5440_gpio_irq_mask(struct irq_data *irqd)
-{
-	struct exynos5440_pinctrl_priv_data *d;
-	unsigned long gpio_int;
-
-	d = irq_data_get_irq_chip_data(irqd);
-	gpio_int = readl(d->reg_base + GPIO_INT);
-	gpio_int &= ~(1 << irqd->hwirq);
-	writel(gpio_int, d->reg_base + GPIO_INT);
-}
-
-/* irq_chip for gpio interrupts */
-static struct irq_chip exynos5440_gpio_irq_chip = {
-	.name		= "exynos5440_gpio_irq_chip",
-	.irq_unmask	= exynos5440_gpio_irq_unmask,
-	.irq_mask	= exynos5440_gpio_irq_mask,
-};
-
-/* interrupt handler for GPIO interrupts 0..7 */
-static irqreturn_t exynos5440_gpio_irq(int irq, void *data)
-{
-	struct exynos5440_gpio_intr_data *intd = data;
-	struct exynos5440_pinctrl_priv_data *d = intd->priv;
-	int virq;
-
-	virq = irq_linear_revmap(d->irq_domain, intd->gpio_int);
-	if (!virq)
-		return IRQ_NONE;
-	generic_handle_irq(virq);
-	return IRQ_HANDLED;
-}
-
-static int exynos5440_gpio_irq_map(struct irq_domain *h, unsigned int virq,
-					irq_hw_number_t hw)
-{
-	struct exynos5440_pinctrl_priv_data *d = h->host_data;
-
-	irq_set_chip_data(virq, d);
-	irq_set_chip_and_handler(virq, &exynos5440_gpio_irq_chip,
-					handle_level_irq);
-	return 0;
-}
-
-/* irq domain callbacks for gpio interrupt controller */
-static const struct irq_domain_ops exynos5440_gpio_irqd_ops = {
-	.map	= exynos5440_gpio_irq_map,
-	.xlate	= irq_domain_xlate_twocell,
-};
-
-/* setup handling of gpio interrupts */
-static int exynos5440_gpio_irq_init(struct platform_device *pdev,
-				struct exynos5440_pinctrl_priv_data *priv)
-{
-	struct device *dev = &pdev->dev;
-	struct exynos5440_gpio_intr_data *intd;
-	int i, irq, ret;
-
-	intd = devm_kzalloc(dev, sizeof(*intd) * EXYNOS5440_MAX_GPIO_INT,
-					GFP_KERNEL);
-	if (!intd)
-		return -ENOMEM;
-
-	for (i = 0; i < EXYNOS5440_MAX_GPIO_INT; i++) {
-		irq = irq_of_parse_and_map(dev->of_node, i);
-		if (irq <= 0) {
-			dev_err(dev, "irq parsing failed\n");
-			return -EINVAL;
-		}
-
-		intd->gpio_int = i;
-		intd->priv = priv;
-		ret = devm_request_irq(dev, irq, exynos5440_gpio_irq,
-					0, dev_name(dev), intd++);
-		if (ret) {
-			dev_err(dev, "irq request failed\n");
-			return -ENXIO;
-		}
-	}
-
-	priv->irq_domain = irq_domain_add_linear(dev->of_node,
-				EXYNOS5440_MAX_GPIO_INT,
-				&exynos5440_gpio_irqd_ops, priv);
-	if (!priv->irq_domain) {
-		dev_err(dev, "failed to create irq domain\n");
-		return -ENXIO;
-	}
-
-	return 0;
-}
-
-static int exynos5440_pinctrl_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct exynos5440_pinctrl_priv_data *priv;
-	struct resource *res;
-	int ret;
-
-	if (!dev->of_node) {
-		dev_err(dev, "device tree node not found\n");
-		return -ENODEV;
-	}
-
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(priv->reg_base))
-		return PTR_ERR(priv->reg_base);
-
-	ret = exynos5440_gpiolib_register(pdev, priv);
-	if (ret)
-		return ret;
-
-	ret = exynos5440_pinctrl_register(pdev, priv);
-	if (ret) {
-		exynos5440_gpiolib_unregister(pdev, priv);
-		return ret;
-	}
-
-	ret = exynos5440_gpio_irq_init(pdev, priv);
-	if (ret) {
-		dev_err(dev, "failed to setup gpio interrupts\n");
-		return ret;
-	}
-
-	platform_set_drvdata(pdev, priv);
-	dev_info(dev, "EXYNOS5440 pinctrl driver registered\n");
-	return 0;
-}
-
-static const struct of_device_id exynos5440_pinctrl_dt_match[] = {
-	{ .compatible = "samsung,exynos5440-pinctrl" },
-	{},
-};
-
-static struct platform_driver exynos5440_pinctrl_driver = {
-	.probe		= exynos5440_pinctrl_probe,
-	.driver = {
-		.name	= "exynos5440-pinctrl",
-		.of_match_table = exynos5440_pinctrl_dt_match,
-		.suppress_bind_attrs = true,
-	},
-};
-
-static int __init exynos5440_pinctrl_drv_register(void)
-{
-	return platform_driver_register(&exynos5440_pinctrl_driver);
-}
-postcore_initcall(exynos5440_pinctrl_drv_register);