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

[Yu-Chun Lin [林祐君]]

Hi Michael,

>On Tue Jul 21, 2026 at 8:58 AM CEST, Yu-Chun Lin wrote:

(...)

>> 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

You are right. I mistakenly used gpiochip_get_data() here.

My current plan to fix this is:
The set_config callback in 'struct gpio_regmap_config' and 'struct gpio_regmap'
should take 'struct gpio_regmap *' as the first argument (replacing
'struct gpio_chip *'), and the driver should use 'gpio_regmap_get_drvdata()'
to retrieve its own data pointer.

I'll add a wrapper in gpio-regmap.c that bridges gpio_chip to gpio_regmap and
handles the fallback to gpiochip_generic_config().

Best Regards,
Yu-Chun