[PATCH v2 1/2] gpiolib: Provide to_gpio_device() helper

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

Provide to_gpio_device() helper which can be utilized in the existing
and future code.

While at it, make sure it becomes no-op at compilation time.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
v2: made helper static inline (Bart)
 drivers/gpio/gpiolib.c | 2 +-
 drivers/gpio/gpiolib.h | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a11480634213..ccd47da4ec66 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -548,7 +548,7 @@ EXPORT_SYMBOL_GPL(gpiochip_line_is_valid);
 
 static void gpiodevice_release(struct device *dev)
 {
-	struct gpio_device *gdev = container_of(dev, struct gpio_device, dev);
+	struct gpio_device *gdev = to_gpio_device(dev);
 	unsigned long flags;
 
 	spin_lock_irqsave(&gpio_lock, flags);
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index d900ecdbac46..e443c1023a37 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -20,9 +20,9 @@
 
 /**
  * struct gpio_device - internal state container for GPIO devices
- * @id: numerical ID number for the GPIO chip
  * @dev: the GPIO device struct
  * @chrdev: character device for the GPIO device
+ * @id: numerical ID number for the GPIO chip
  * @mockdev: class device used by the deprecated sysfs interface (may be
  * NULL)
  * @owner: helps prevent removal of modules exporting active GPIOs
@@ -47,9 +47,9 @@
  * userspace.
  */
 struct gpio_device {
-	int			id;
 	struct device		dev;
 	struct cdev		chrdev;
+	int			id;
 	struct device		*mockdev;
 	struct module		*owner;
 	struct gpio_chip	*chip;
@@ -72,6 +72,11 @@ struct gpio_device {
 #endif
 };
 
+static inline struct gpio_device *to_gpio_device(struct device *dev)
+{
+	return container_of(dev, struct gpio_device, dev);
+}
+
 /* gpio suffixes used for ACPI and device tree lookup */
 static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
 
-- 
2.35.1