[PATCH RFC 0/9] gpio: improve support for shared GPIOs

[Bartosz Golaszewski]

On Mon, Oct 6, 2025 at 11:55 PM Srinivas Kandagatla <srini at kernel.org> wrote:
>
> >
> > If they were called "reset-gpios" then we could (and should) use
> > Krzysztof's reset-gpio driver here, but we have many cases where
> > that's not the case and the names (and implied functions) are
>
> Yes, these codec drivers are due to be moved to use reset-gpios.
>

You will still need to keep support for the current "powerdown-gpios"
property in existing device tree sources so that doesn't change
anything. And what about shared pins other than reset? 'dc-gpios' for
display, other 'powerdown' instances, 'enable-gpios', all kinds of
uncommon names like: `dlg,cs`, `wlf,ldo2ena`, `speaker-enable`,
`maxim,enable`? It's not likely we will create a separate abstraction
for each of them. What I'm proposing is a sane, catch-all mechanism
for shared GPIOs that right now use a rather wonky hack. Also: the
drivers have no business knowing that they request GPIOs that can be
shared. This is why I want to hide it inside GPIOLIB.

Bartosz