[PATCH V2] pinctrl: bcm2835: Make pin freeing behavior configurable

[Linus Walleij]

On Fri, May 3, 2024 at 8:28 AM Stefan Wahren <wahrenst at gmx.net> wrote:

> Until now after a bcm2835 pin was freed its pinmux was set to GPIO_IN.
> So in case it was configured as GPIO_OUT before the configured output
> level also get lost. As long as GPIO sysfs was used this wasn't
> actually a problem because the pins and their possible output level
> were kept by sysfs.
>
> Since more and more Raspberry Pi users start using libgpiod they are
> confused about this behavior. So make the pin freeing behavior of
> GPIO_OUT configurable via module parameter. In case
> pinctrl-bcm2835.persist_gpio_outputs is set to 1, the output level is
> kept.
>
> This patch based on the downstream work of Phil Elwell.
>
> Link: https://github.com/raspberrypi/linux/pull/6117
> Signed-off-by: Stefan Wahren <wahrenst at gmx.net>

Patch applied!

Yours,
Linus Walleij