[RFC v2 4/5] gpio: add pinctrl based generic gpio driver

[Linus Walleij]

On Thu, Oct 5, 2023 at 4:59 AM AKASHI Takahiro
<takahiro.akashi at linaro.org> wrote:


> Some pin controllers provide not only a method to set up lines but
> also gpio function. With this commit, a new generic gpio driver will
> be provided. It is implemented purely by using pinctrl interfaces.
> One of such pin controllers is Arm's SCMI.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
> RFC v2 (Oct 5, 2023)

RFC v2 looks very good to me, definitely something that can be merged
as a starting point once the hardware has been tested.

> +static int pin_control_gpio_direction_input(struct gpio_chip *chip,
> +                                           unsigned int offset)
> +{
> +       return pinctrl_gpio_direction_input(chip->gpiodev->base + offset);
> +}
> +
> +static int pin_control_gpio_direction_output(struct gpio_chip *chip,
> +                                            unsigned int offset, int val)
> +{
> +       return pinctrl_gpio_direction_output(chip->gpiodev->base + offset);
> +}

IIRC Bartosz is working on a patch set getting rid of this kludge having to
call with base + offset in every driver, replacing it with generic calls that
you can just assign in the gpio_chip.

When this gets applied these changes will likely be in place so you will
get rid of this too.

Yours,
Linus Walleij