[PATCH v8 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.

Reviewed-by: Michael Walle <mwalle@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>
Signed-off-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
---
Changes in v8:
- Move the assignment of gpio->set_config into the if (config->set_config)
block.
- Add Reviewed-by tags from Michael and Linus.
---
 drivers/gpio/gpio-regmap.c  | 17 +++++++++++++++++
 include/linux/gpio/regmap.h |  6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index cff7db8036f7..19e33e361cc4 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;
 };
 
@@ -306,6 +309,15 @@ 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);
@@ -444,6 +456,11 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 
 	gpio->value_xlate = config->value_xlate;
 
+	if (config->set_config) {
+		gpio->set_config = 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 77dbb353bc1f..dd9de9958409 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -86,6 +86,9 @@ enum gpio_regmap_operation {
  *			to append additional bits (like write-enable masks)
  *			dynamically based on the current operation
  *			(GPIO_REGMAP_SET_OP and GPIO_REGMAP_SET_DIR_OP).
+ * @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).
@@ -147,6 +150,9 @@ 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