RE: [PATCH v6 5/8] gpio: regmap: Add gpio_regmap_operation and value_xlate support

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

Hi Michael,

> Hi
>
> Thanks! Looks very good, a few comments below.
>
> On Tue Jul 21, 2026 at 8:57 AM CEST, Yu-Chun Lin wrote:
>> Extend the reg_mask_xlate callback with an operation type parameter 
>> (enum gpio_regmap_operation) to allow drivers to return different 
>> register/mask combinations depending on the specific GPIO operation.
>>
>> In addition, introduce a new optional 'value_xlate' callback. This 
>> routine allows drivers to translate or modify the register value and 
>> mask immediately before a write operation. It is particularly useful 
>> for hardware that requires additional control bits, such as a 
>> write-enable bit, to be appended to the data dynamically.
>
> Please split that into two patches.
>

I will split the value_xlate and reg_mask_xlate changes into separate
patches.

>> Consequently, update all existing drivers utilizing the gpio-regmap 
>> framework (across drivers/gpio, drivers/iio, and drivers/pinctrl) to 
>> accommodate the new reg_mask_xlate function signature.
>>
>> Suggested-by: Linus Walleij <linusw@kernel.org>
>> Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
>> ---
>> Changes in v6:
>> - Remove removed the hardcoded write-enable workarounds.
>> - Retain the necessary prototype updates in every driver using custom 
>> reg_mask_xlate
>> - Add value_xlate to dynamically adjust the register mask and value 
>> right before the actual register write operation.
>> ---
>>  drivers/gpio/gpio-104-idi-48.c        |  7 +--
>>  drivers/gpio/gpio-i8255.c             |  4 +-
>>  drivers/gpio/gpio-idio-16.c           |  6 +--
>>  drivers/gpio/gpio-max7360.c           |  1 +
>>  drivers/gpio/gpio-pcie-idio-24.c      |  6 +--
>>  drivers/gpio/gpio-regmap.c            | 62 ++++++++++++++++++++++-----
>>  drivers/iio/adc/ad7173.c              |  8 ++--
>>  drivers/iio/addac/stx104.c            |  6 +--
>>  drivers/pinctrl/bcm/pinctrl-bcm63xx.c |  1 +
>>  drivers/pinctrl/pinctrl-tps6594.c     |  1 +
>>  include/linux/gpio/regmap.h           | 44 +++++++++++++++++--
>>  11 files changed, 115 insertions(+), 31 deletions(-)
>>
>
>..
>
>> diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h 
>> index a3ba8242c353..45a30f50043f 100644
>> --- a/include/linux/gpio/regmap.h
>> +++ b/include/linux/gpio/regmap.h
>> @@ -13,6 +13,36 @@ struct regmap;
>>  #define GPIO_REGMAP_ADDR_ZERO ((unsigned int)(-1))  #define 
>> GPIO_REGMAP_ADDR(addr) ((addr) ? : GPIO_REGMAP_ADDR_ZERO)
>>  
>> +/**
>> + * enum gpio_regmap_operation - Operation type for reg_mask_xlate 
>> +callback
>> + *
>> + * This enum is used to distinguish between different types of GPIO 
>> +operations
>> + * so that the reg_mask_xlate callback can return the appropriate 
>> +mask for each
>> + * operation type.
>
> "Traditionally it was inferred from the base regsister. But that might not
> always work, for example if all the control bits of one GPIO lives in the
> same register. The user is free to choose which method they'll use."
>

Understood. I will add this background context to the comment.

Best Regards,
Yu-Chun

>> + *
>> + * Value operations:
>> + * @GPIO_REGMAP_GET_OP: Mask for reading direction to detect if GPIO is input or output.
>> + *                      Used in gpio_regmap_get() to determine the GPIO direction.
>> + * @GPIO_REGMAP_IN: Mask for reading input value. Used when GPIO is configured as input.
>> + * @GPIO_REGMAP_OUT: Mask for reading output value. Used when GPIO is configured as output.
>> + *
>> + * Output operations:
>> + * @GPIO_REGMAP_SET_OP: Mask for setting GPIO output value.
>> + *
>> + * Direction operations:
>> + * @GPIO_REGMAP_GET_DIR_OP: Mask for reading GPIO direction (input/output).
>> + * @GPIO_REGMAP_SET_DIR_OP: Mask for setting GPIO direction (input/output).
>> + *
>> + */