Re: [PATCH v3 2/2] gpio: mxc: Always set GPIOs used as interrupt source to INPUT mode

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Mon, Jul 25, 2022 at 10:36 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
> On Sun, Jul 24, 2022 at 7:21 PM Marek Vasut <marex@xxxxxxx> wrote:
> >
> > Always configure GPIO pins which are used as interrupt source as INPUTs.
> > In case the default pin configuration is OUTPUT, or the prior stage does
> > configure the pins as OUTPUT, then Linux will not reconfigure the pin as
> > INPUT and no interrupts are received.
> >
> > Always configure interrupt source GPIO pin as input to fix the above case.
>
> the interrupt
>
> ...
>
> I'm wondering if it's configured as output (by who?) shouldn't you
> issue a warning?

That could be the power-on default or boot loader that put it
into output mode I think, so it can be something outside of the kernel
and outside of our control. We just adjust the reality to the map
and go on :P

Yours,
Linus Walleij