Re: [PATCH v2] pinctrl: tegra: Set SFIO mode to Mux Register

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Mar 6, 2025 at 6:06 AM Prathamesh Shete <pshete@xxxxxxxxxx> wrote:

> Tegra devices have an 'sfsel' bit field that determines whether a pin
> operates in SFIO (Special Function I/O) or GPIO mode. Currently,
> tegra_pinctrl_gpio_disable_free() sets this bit when releasing a GPIO.
>
> However, tegra_pinctrl_set_mux() can be called independently in certain
> code paths where gpio_disable_free() is not invoked. In such cases, failing
> to set the SFIO mode could lead to incorrect pin configurations, resulting
> in functional issues for peripherals relying on SFIO.
>
> This patch ensures that whenever set_mux() is called, the SFIO mode is
> correctly set in the Mux Register if the 'sfsel' bit is present. This
> prevents situations where the pin remains in GPIO mode despite being
> configured for SFIO use.
>
> Fixes: 59b67585e242 ("pinctrl: add a driver for NVIDIA Tegra")
> Signed-off-by: Prathamesh Shete <pshete@xxxxxxxxxx>

Patch applied.

I can't tell how urgent this patch is so I have applied it for next
for the moment.

Yours,
Linus Walleij