[PATCH v8 02/22] gpio: regmap: set gpio_chip of_node

[Álvaro Fernández Rojas <noltari@xxxxxxxxx>]

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

Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
Reviewed-by: Michael Walle <michael@xxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
 v8: no changes
 v7: add gpio-regmap.c comment
 v6: add comment and simplify of_node assignment
 v5: switch to fwnode
 v4: fix documentation
 v3: introduce patch needed for properly parsing gpio-range

 drivers/gpio/gpio-regmap.c  | 2 ++
 include/linux/gpio/regmap.h | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 5412cb3b0b2a..2215d712da08 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -249,6 +249,8 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 	chip = &gpio->gpio_chip;
 	chip->parent = config->parent;
+       /* gpiolib will use of_node of the parent if chip->of_node is NULL */
+	chip->of_node = to_of_node(config->fwnode);
 	chip->base = -1;
 	chip->ngpio = config->ngpio;
 	chip->names = config->names;
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index ad76f3d0a6ba..334dd928042b 100644
--- a/include/linux/gpio/regmap.h
+++ b/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 +17,8 @@ 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.
+ *			If not given, the fwnode of the parent is used.
  * @label:		(Optional) Descriptive name for GPIO controller.
  *			If not given, the name of the device is used.
  * @ngpio:		Number of GPIOs
@@ -57,6 +60,7 @@ struct regmap;
 struct gpio_regmap_config {
 	struct device *parent;
 	struct regmap *regmap;
+	struct fwnode_handle *fwnode;
 
 	const char *label;
 	int ngpio;
-- 
2.20.1