Re: [PATCH v3 3/7] pinctrl: core: Make pin group callbacks optional

[Linus Walleij]

On Mon, Mar 9, 2026 at 2:49 PM Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote:

> Currently, the pinctrl core strictly requires all drivers to implement
> .get_groups_count and .get_group_name callbacks in their pinctrl_ops.
>
> However, for simple pinctrl drivers that act purely as GPIO controllers
> and pin-specific configuration proxies (without any concept of muxing or
> pin groups), this strict requirement forces the implementation of dummy
> callbacks just to satisfy pinctrl_check_ops().
>
> Relax this requirement by making the group callbacks optional. Update
> the core and debugfs (pinconf) functions to check for the existence of
> these callbacks before invoking them, allowing simple drivers to omit
> group boilerplate entirely.
>
> Suggested-by: Linus Walleij <linusw@xxxxxxxxxx>
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>

Reviewed-by: Linus Walleij <linusw@xxxxxxxxxx>

If this patch set doesn't go into MFD as-is for this next merge
window, I sure want to apply this one patch to pinctrl.

Lee: I can also apply it and give you an immutable branch
with this one patch if you prefer.

Yours,
Linus Walleij