gpio: make of_get_named_gpiod_flags() private

of_get_named_gpiod_flags() is visible and directly usable by GPIO
consumers, but it really should not as the gpiod interface relies
on the simpler gpiod_get() to provide properly-configured GPIOs.

of_get_named_gpiod_flags() is just used internally by gpiolib to
implement gpiod_get(), and by the old of_get_named_gpio_flags()
function, therefore it makes sense to make it gpiolib-private.

As a side-effect, the unused (and unneeded) of_get_gpiod_flags()
inline function is also removed, and of_get_named_gpio_flags() is moved
from a static inline function to a regular one in gpiolib-of.c

This results in all references to gpiod_* functions in of_gpio.h being
gone, which is the way it should be since this file is part of the old
integer GPIO interface.

Changes since v1:
- Fixed compilation error when CONFIG_OF_GPIO is not defined
- Fixed warning due to of_gpio_flags enum not being declared
in private gpiolib.h header

Signed-off-by: Alexandre Courbot <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpiolib-of.c

···
 }
 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)
+{
+	struct gpio_desc *desc;
+
+	desc = of_get_named_gpiod_flags(np, list_name, index, flags);
+
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+	else
+		return desc_to_gpio(desc);
+}
+EXPORT_SYMBOL(of_get_named_gpio_flags);
+
 /**
  * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
  * @gc:		pointer to the gpio_chip structure

drivers/gpio/gpiolib.h

···
 #include <linux/err.h>
 #include <linux/device.h>
 
+enum of_gpio_flags;
+
 /**
  * struct acpi_gpio_info - ACPI GPIO specific information
  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
···
 
 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);
 
 #endif /* GPIOLIB_H */

include/linux/of_gpio.h

···
 #include <linux/errno.h>
 #include <linux/gpio.h>
 #include <linux/of.h>
-#include <linux/gpio/consumer.h>
 
 struct device_node;
 
···
 	return container_of(gc, struct of_mm_gpio_chip, gc);
 }
 
-extern struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+extern int of_get_named_gpio_flags(struct device_node *np,
 		const char *list_name, int index, enum of_gpio_flags *flags);
 
 extern int of_mm_gpiochip_add(struct device_node *np,
···
 #else /* CONFIG_OF_GPIO */
 
 /* Drivers may not strictly depend on the GPIO support, so let them link. */
-static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+static inline int of_get_named_gpio_flags(struct device_node *np,
 		const char *list_name, int index, enum of_gpio_flags *flags)
 {
-	return ERR_PTR(-ENOSYS);
+	return -ENOSYS;
 }
 
 static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
···
 static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 
 #endif /* CONFIG_OF_GPIO */
-
-static inline int of_get_named_gpio_flags(struct device_node *np,
-		const char *list_name, int index, enum of_gpio_flags *flags)
-{
-	struct gpio_desc *desc;
-	desc = of_get_named_gpiod_flags(np, list_name, index, flags);
-
-	if (IS_ERR(desc))
-		return PTR_ERR(desc);
-	else
-		return desc_to_gpio(desc);
-}
 
 /**
  * of_gpio_named_count() - Count GPIOs for a device
···
 static inline int of_gpio_count(struct device_node *np)
 {
 	return of_gpio_named_count(np, "gpios");
-}
-
-/**
- * of_get_gpiod_flags() - Get a GPIO descriptor and flags to use with GPIO API
- * @np:		device node to get GPIO from
- * @index:	index of the GPIO
- * @flags:	a flags pointer to fill in
- *
- * Returns GPIO descriptor to use with Linux generic GPIO API, or a errno
- * value on the error condition. If @flags is not NULL the function also fills
- * in flags for the GPIO.
- */
-static inline struct gpio_desc *of_get_gpiod_flags(struct device_node *np,
-					int index, enum of_gpio_flags *flags)
-{
-	return of_get_named_gpiod_flags(np, "gpios", index, flags);
 }
 
 static inline int of_get_gpio_flags(struct device_node *np, int index,