gpiolib: of: make fwnode take precedence in struct gpio_chip

If the driver sets the fwnode in struct gpio_chip, let it take
precedence over the of_node. This only affects OF-based systems,
ACPI needs to be converted separately.
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -1046,6 +1046,9 @@ void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev)
 	if (gc->parent)
 		gdev->dev.of_node = gc->parent->of_node;
 
+	if (gc->fwnode)
+		gc->of_node = to_of_node(gc->fwnode);
+
 	/* If the gpiochip has an assigned OF node this takes precedence */
 	if (gc->of_node)
 		gdev->dev.of_node = gc->of_node;