[RFC 1/4] pinctrl: define PIN_CONFIG_INPUT

[Linus Walleij]

Hi Takahiro,

On Mon, Oct 2, 2023 at 4:17 AM AKASHI Takahiro
<takahiro.akashi at linaro.org> wrote:

> This allows for enabling SCMI pinctrl based GPIO driver to obtain
> an input gpio pin.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
(...)
> + * @PIN_CONFIG_INPUT: This will obtain a value on an input pin. The returned
> + *     argument indicates the value.

We need to specify that this is the inverse of @PIN_CONFIG_OUTPUT,
that setting a line into *input mode* requires the use of
@PIN_CONFIG_INPUT_ENABLE, so the config can never be set
but should return an error on set, and that the argument returned is 1 for
logic high and 0 for logic low.

Otherwise I think this is fine!

Yours,
Linus Walleij