[PATCH] Pinctrl: core: export pinctrl_provide_dummies() to fix build error

[Linus Walleij]

On Wed, Oct 29, 2025 at 4:35 AM Gary Yang <gary.yang at cixtech.com> wrote:


> Generally a device may has two states: default state and sleep state. They are included in DTS file.
> So DTS has two nodes, one is for default state, and the other is for sleep state. When the device works, select
> default state, but select sleep state when the system enters str.

What is "str"? stand-by-retention? (Sorry for my ignorance.)

> There is two pinctrl controllers on CIX sky1. One is used under S0 state, and the other is used under S0 and S5 state.
> When enter str, the system enter S3 state and S0 domain power off. So the pinctrl controller under S0 state is also off.
> The settings for sleep state are loft and make no sense.
>
> But if we remove these settings, the pinctrl can't find sleep state and can't change state when system enter str.
> When resume pinctrl, pinctrl core may think state is still the same as before. So the settings can't be applied
> as expected.

Aha!

> To avoid write these unused settings in DTS file, we have to use pinctrl_provide_dummies() interface.
> Do you agree our schemes? What's your opinion? Please give us some suggestions. Thanks

I think it's fine to use the pinctrl dummies, I will draft a patch and
send so you can ACK it.

It's fun to get the whole picture of how this works on CIX silicon,
it's a new way of doing
things with two different pin controllers so I haven't seen this before!

Yours,
Linus Walleij