[PATCH v7 7/9] gpio: regmap: Add set_config callback

[Yu-Chun Lin]

Add a new set_config callback to allow drivers to implement
hardware-specific configuration such as debounce settings, or other
platform-specific GPIO properties.

Signed-off-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
---
Changes in v7:
- Drop the reviewed by tag from Andy due to the signature changes.
- Add 'struct gpio_regmap' as the first parameter to the set_config callback.
- Add wrapper to bridge gpio_chip to gpio_regmap.
---
 drivers/gpio/gpio-regmap.c  | 16 ++++++++++++++++
 include/linux/gpio/regmap.h |  6 ++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index 8f58b272b870..98cfdd890069 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -51,6 +51,9 @@ struct gpio_regmap {
 			   unsigned int reg, unsigned int *mask,
 			   unsigned int *val);
 
+	int (*set_config)(struct gpio_regmap *gpio, struct gpio_chip *chip,
+			  unsigned int offset, unsigned long config);
+
 	void *driver_data;
 };
 
@@ -317,6 +320,15 @@ static int gpio_regmap_direction_output(struct gpio_chip *chip,
 	return gpio_regmap_set_direction(chip, offset, true);
 }
 
+static int gpio_regmap_set_config(struct gpio_chip *chip,
+				  unsigned int offset,
+				  unsigned long cfg)
+{
+	struct gpio_regmap *gpio = gpiochip_get_data(chip);
+
+	return gpio->set_config(gpio, chip, offset, cfg);
+}
+
 int gpio_regmap_reqres_irq(struct gpio_regmap *gpio, unsigned int offset)
 {
 	return gpiochip_reqres_irq(&gpio->gpio_chip, offset);
@@ -386,6 +398,7 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 	gpio->reg_clr_base = config->reg_clr_base;
 	gpio->reg_dir_in_base = config->reg_dir_in_base;
 	gpio->reg_dir_out_base = config->reg_dir_out_base;
+	gpio->set_config = config->set_config;
 
 	chip = &gpio->gpio_chip;
 	chip->parent = config->parent;
@@ -455,6 +468,9 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 	gpio->value_xlate = config->value_xlate;
 
+	if (config->set_config)
+		chip->set_config = gpio_regmap_set_config;
+
 	ret = gpiochip_add_data(chip, gpio);
 	if (ret < 0)
 		goto err_free_bitmap_output;
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index b77d6371cd9c..4bf4319ec12e 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -93,6 +93,9 @@ enum gpio_regmap_operation {
  *			mask before writing. This allows driver-specific logic
  *			to append additional bits (like write-enable masks)
  *			dynamically based on the current operation.
+ * @set_config:		(Optional) Callback for setting GPIO configuration such
+ *			as debounce, drive strength, or other hardware specific
+ *			settings.
  * @drvdata:		(Optional) Pointer to driver specific data which is
  *			not used by gpio-remap but is provided "as is" to the
  *			driver callback(s).
@@ -154,6 +157,9 @@ struct gpio_regmap_config {
 			   unsigned int base, unsigned int offset, unsigned int reg,
 			   unsigned int *mask, unsigned int *val);
 
+	int (*set_config)(struct gpio_regmap *gpio, struct gpio_chip *chip,
+			  unsigned int offset, unsigned long config);
+
 	void *drvdata;
 };
 
-- 
2.43.0