gpio: regmap: set gpio_chip of_node

This is needed for properly registering GPIO regmap as a child of a regmap
pin controller.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Michael Walle <michael@walle.cc>

drivers/gpio/gpio-regmap.c

@@ -249,6 +249,10 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 	chip = &gpio->gpio_chip;
 	chip->parent = config->parent;
+	if (config->fwnode)
+		chip->of_node = to_of_node(config->fwnode);
+	else
+		chip->of_node = dev_of_node(config->parent);
 	chip->base = -1;
 	chip->ngpio = config->ngpio;
 	chip->names = config->names;

include/linux/gpio/regmap.h

@@ -4,6 +4,7 @@
 #define _LINUX_GPIO_REGMAP_H
 
 struct device;
+struct fwnode_handle;
 struct gpio_regmap;
 struct irq_domain;
 struct regmap;
@@ -16,6 +17,7 @@ struct regmap;
  * @parent:		The parent device
  * @regmap:		The regmap used to access the registers
  *			given, the name of the device is used
+ * @fwnode:		(Optional) The firmware node
  * @label:		(Optional) Descriptive name for GPIO controller.
  *			If not given, the name of the device is used.
  * @ngpio:		Number of GPIOs
@@ -57,6 +59,7 @@ struct regmap;
 struct gpio_regmap_config {
 	struct device *parent;
 	struct regmap *regmap;
+	struct fwnode_handle *fwnode;
 
 	const char *label;
 	int ngpio;