[PATCH v3 4/7] gpio: regmap: Add set_config callback

[Yu-Chun Lin <eleanor.lin@realtek.com>]

Add a new set_config callback to struct gpio_regmap_config 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@realtek.com>
---
 drivers/gpio/gpio-regmap.c  | 2 ++
 include/linux/gpio/regmap.h | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
index c76eef20e412..490a35fe8768 100644
--- a/drivers/gpio/gpio-regmap.c
+++ b/drivers/gpio/gpio-regmap.c
@@ -371,6 +371,8 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
 	if (!gpio->reg_mask_xlate)
 		gpio->reg_mask_xlate = gpio_regmap_simple_xlate;
 
+	chip->set_config = config->set_config;
+
 	ret = gpiochip_add_data(chip, gpio);
 	if (ret < 0)
 		goto err_free_bitmap;
diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
index 519fc81add8a..0660fd9be928 100644
--- a/include/linux/gpio/regmap.h
+++ b/include/linux/gpio/regmap.h
@@ -89,6 +89,9 @@ enum gpio_regmap_operation {
  *			domain will be set accordingly.
  * @regmap_irq_line:	(Optional) The IRQ the device uses to signal interrupts.
  * @regmap_irq_flags:	(Optional) The IRQF_ flags to use for the interrupt.
+ * @set_config:		(Optional) Callback for setting GPIO configuration such
+ *			as debounce, drive strength, or other hardware specific
+ *			settings.
  *
  * The ->reg_mask_xlate translates a given base address and GPIO offset to
  * register and mask pair. The base address is one of the given register
@@ -142,6 +145,10 @@ struct gpio_regmap_config {
 			       unsigned long *valid_mask,
 			       unsigned int ngpios);
 
+	int (*set_config)(struct gpio_chip *gc,
+			  unsigned int offset,
+			  unsigned long config);
+
 	void *drvdata;
 };
 
-- 
2.34.1