Re: [RFC PATCH v2 0/3] gpio: add PMIO support to gpio-mmio

[Bartosz Golaszewski]

On Wed, Apr 22, 2026 at 6:44 PM Linus Walleij <linusw@xxxxxxxxxx> wrote:
>
> On Mon, Apr 13, 2026 at 12:24 PM Jose Javier Rodriguez Barbarin
> <dev-josejavier.rodriguez@xxxxxxxxxx> wrote:
>
> > This series is an RFC for adding port-mapped I/O (PMIO) support to
> > gpio-mmio.
> >
> > This v2 comes with all suggestions done by Linux Walleij in the
> > initial review [1].
>
> That name! ;)
>
> > For keeping compatibility with gpio_generic_chip, a new _config struct
> > was added instead of extending gpio_generic_chip_config. Using such new
> > _config struct, called gpio_generic_chip_port_config, requires a new API
> > function gpio_generic_chip_port_init() to access to that new structure.
> >
> > Besides, structure gpio_chip_reg has been transformed to union. It reflects
> > better that MMIO and PMIO chips will only use one of them, saving memory
> > as well.
> >
> > I'm still sending this as RFC but I don't know if I should send this as a
> > regular PATCH series.
>
> I think we will usually only merge infrastructure if there is also a
> consumer/user of it going in at the same time so these patches will
> need to be prepended to a driver patch.
>

Agreed. If the driver in question is not targetting drivers/gpio/, I
can provide an immutable branch with these patches.

Bart