Re: [PATCH v3] pinctrl: sunxi: fix gpiochip_lock_as_irq() failure when pinmux is unknown

[Chen-Yu Tsai]

On Sat, Mar 14, 2026 at 4:10 PM Michal Piekos
<michal.piekos@xxxxxxxxxxxxx> wrote:
>
> Fixes kernel hang during boot due to inability to set up IRQ on AXP313a.
>
> The issue is caused by gpiochip_lock_as_irq() which is failing when gpio
> is in unitialized state.
>
> Solution is to set pinmux to GPIO INPUT in
> sunxi_pinctrl_irq_request_resources() if it wasn't initialized
> earlier.
>
> Tested on Orange Pi Zero 3.
>
> Signed-off-by: Michal Piekos <michal.piekos@xxxxxxxxxxxxx>
> Suggested-by: Chen-Yu Tsai <wens@xxxxxxxxxx>

Interesting solution, not at all what I had in mind. :D
This fixes things immediately for sunxi, and keeps proper pin lockout,
i.e. one can't use a pin muxed for other uses as a GPIO interrupt pin.
I was hoping that the maintainers could provide some guidance as to
whether the core could provide helpers for this, but for now:

Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxxxx>