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

[Bartosz Golaszewski]

On Wed, Sep 24, 2025 at 8:25 PM Dmitry Torokhov
<dmitry.torokhov at gmail.com> wrote:
>
> Hi Bartosz,
>
> On Wed, Sep 24, 2025 at 04:51:28PM +0200, Bartosz Golaszewski wrote:
> > Here's a functional RFC for improving the handling of shared GPIOs in
> > linux.
> >

[snip]

> >
> > The practical use-case for this are the powerdown GPIOs shared by
> > speakers on Qualcomm db845c platform, however I have also extensively
> > tested it using gpio-virtuser on arm64 qemu with various DT
> > configurations.
>
> How is this different from the existing gpio-backed regulator/supply?
> IMO GPIOs are naturally exclusive-use resources (in cases when you need
> to control them, not simply read their state), and when there is a need
> to share them there are more appropriate abstractions that are built on
> top of GPIOs...
>

I think you have never been on the receiving end of Krzysztof's wrath
when trying to model a simple shared pin as a nonexistent reset
provider or a fixed regulator in device-tree. :)

Unless you mean some other abstractions I am missing.

Bartosz