[PATCH 1/2] dt-bindings: gpio: cdns: add clock-names property

[Linus Walleij]

On Wed, Mar 11, 2026 at 1:08 PM Zichar Zhang <zichar.zhang at cixtech.com> wrote:
> On Fri, Mar 06, 2026 at 11:10:35AM +0100, Linus Walleij wrote:
> > [You don't often get email from linusw at kernel.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> >
> > EXTERNAL EMAIL
> >
> > Hi Zichar,
> >
> > On Fri, Mar 6, 2026 at 10:32 AM Zichar Zhang <zichar.zhang at cixtech.com> wrote:
> >
> > > +  clock-names:
> > > +    description:
> > > +      Optional name for the GPIO controller input clock.
> > > +    minItems: 1
> > > +    maxItems: 1
> >
> > I think clock-names: true should suffice, but the binding maintainers
> > can say how
> > they want it.
> >
> > I would suggest to also add:
> >
> >   gpio-ranges:
> >     minItems: 1
> >     maxItems: 32
> >
> > At this point even if you're not using it FTM. This will make it
> > possible to later
> > map the GPIOs to the pin controller and control pin configuration from the
> > GPIO subsystem.
>
> Thanks. Given that cdns,gpio.yaml already defines "ngpios", would it make
> sense to use it for the "gpio-ranges" definition?

You mean like

maxItems: (ngpios) ? ngpios : 32

or something like that?

I don't think YAML can do variables that way, but Rob might know better.

We sure know 32 is a cap.

Yours,
Linus Walleij