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: Dipen Patel <dipenp@nvidia.com>
Tested-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231010151709.4104747-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 191f9c87b4d0b1f05928584fb04947980c26304a..dd18dd56c33c8da28850271662cd203689b2a214 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index f8ad7f40100c222607bfde8d49544ed307fce82e..ae4162d3f1d3c958fd50a3d4c11a178abf8ffca2 100644 (file)
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -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);