Re: [PATCH v6 6/8] gpio: regmap: Add set_config callback

[Michael Walle]

On Tue Jul 21, 2026 at 8:58 AM CEST, Yu-Chun Lin wrote:
> 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.
>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
> Signed-off-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
> ---
> Changes in v6:
> - None.
> ---
>  drivers/gpio/gpio-regmap.c  | 1 +
>  include/linux/gpio/regmap.h | 5 +++++
>  2 files changed, 6 insertions(+)
>
> diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
> index aecc35f610dd..b856326ff01c 100644
> --- a/drivers/gpio/gpio-regmap.c
> +++ b/drivers/gpio/gpio-regmap.c
> @@ -454,6 +454,7 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
>  		gpio->reg_mask_xlate = gpio_regmap_simple_xlate;
>  
>  	gpio->value_xlate = config->value_xlate;
> +	chip->set_config = config->set_config;
>  
>  	ret = gpiochip_add_data(chip, gpio);
>  	if (ret < 0)
> diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
> index 45a30f50043f..23460995c1d1 100644
> --- a/include/linux/gpio/regmap.h
> +++ b/include/linux/gpio/regmap.h
> @@ -89,6 +89,9 @@ 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).
> @@ -150,6 +153,8 @@ struct gpio_regmap_config {
>  			   unsigned int base, unsigned int offset, unsigned int reg,
>  			   unsigned int *mask, unsigned int *val);
>  
> +	int (*set_config)(struct gpio_chip *gc, unsigned int offset, unsigned long config);
> +

Do we need an additional struct gpio_regmap pointer as a first
argument? How does the driver fetch the attached opaque data
pointer? I see that your driver is doing

 struct rtd1625_gpio *data = gpiochip_get_data(chip)

But it is the gpio-regmap core which will attach it's own data
pointer to gpio_chip, no?

-michael

>  	void *drvdata;
>  };
>

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