Commit 668706b1 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Bartosz Golaszewski
Browse files

gpiolib: provide gpio_device_find_by_fwnode() 



One of the ways of looking up GPIO devices is using their fwnode.
Provide a helper for that to avoid every user implementing their
own matching function.

Reviewed-by: default avatarDipen Patel <dipenp@nvidia.com>
Tested-by: default avatarDipen Patel <dipenp@nvidia.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231010151709.4104747-2-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
parent 74975b4f

drivers/gpio/gpiolib.c

+20 −0
Original line number Diff line number Diff line
@@ -1145,6 +1145,26 @@ struct gpio_device *gpio_device_find_by_label(const char *label) 
}

EXPORT_SYMBOL_GPL(gpio_device_find_by_label);



static int gpio_chip_match_by_fwnode(struct gpio_chip *gc, void *fwnode)

{

	return device_match_fwnode(&gc->gpiodev->dev, fwnode);

}



/**

 * gpio_device_find_by_fwnode() - wrapper around gpio_device_find() finding

 *                                the GPIO device by its fwnode

 * @fwnode: Firmware node to lookup

 *

 * Returns:

 * Reference to the GPIO device or NULL. Reference must be released with

 * gpio_device_put().

 */

struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode)

{

	return gpio_device_find((void *)fwnode, gpio_chip_match_by_fwnode);

}

EXPORT_SYMBOL_GPL(gpio_device_find_by_fwnode);



/**

 * gpio_device_get() - Increase the reference count of this GPIO device

 * @gdev: GPIO device to increase the refcount for

include/linux/gpio/driver.h

+1 −0
Original line number Diff line number Diff line
@@ -611,6 +611,7 @@ struct gpio_chip *gpiochip_find(void *data, 
struct gpio_device *gpio_device_find(void *data,

				int (*match)(struct gpio_chip *gc, void *data));

struct gpio_device *gpio_device_find_by_label(const char *label);

struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode);



struct gpio_device *gpio_device_get(struct gpio_device *gdev);

void gpio_device_put(struct gpio_device *gdev);