linux-kernel - Re: [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings

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Message-ID: <CAMuHMdVTj-TLZz=ieW648cqV4fWBHb4nnt59N5EEFw2qZ0jbaA@mail.gmail.com>
Date:   Sat, 3 Jul 2021 10:49:51 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Michael Zhu <michael.zhu@...rfivetech.com>,
        Fu Wei <tekkamanninja@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Huan Feng <huan.feng@...rfivetech.com>
Subject: Re: [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings

Hi Drew,

On Sat, Jul 3, 2021 at 8:46 AM Drew Fustini <drew@...gleboard.org> wrote:
> On Fri, Jul 02, 2021 at 11:03:56PM +0200, Geert Uytterhoeven wrote:
> > On Fri, Jul 2, 2021 at 10:56 PM Drew Fustini <drew@...gleboard.org> wrote:
> > > On Thu, Jul 01, 2021 at 10:34:56AM +0200, Geert Uytterhoeven wrote:
> > > > On Thu, Jul 1, 2021 at 2:22 AM Drew Fustini <drew@...gleboard.org> wrote:
> > > > > Add bindings for the GPIO controller in the StarFive JH7100 SoC [1].
> > > > >
> > > > > [1] https://github.com/starfive-tech/beaglev_doc
> > > > >
> > > > > Signed-off-by: Drew Fustini <drew@...gleboard.org>
> > > > > Signed-off-by: Huan Feng <huan.feng@...rfivetech.com>
> > > >
> > > > Thanks for your patch!
> > > >
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/gpio/starfive,jh7100-gpio.yaml
> > > > > @@ -0,0 +1,60 @@
> > > > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > > > +%YAML 1.2
> > > > > +---
> > > > > +$id: http://devicetree.org/schemas/gpio/starfive,jh7100-gpio.yaml#
> > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > +
> > > > > +title: StarFive JH7100 GPIO controller
> > > > > +
> > > > > +maintainers:
> > > > > +  - Huan Feng <huan.feng@...rfivetech.com>
> > > > > +  - Drew Fustini <drew@...gleboard.org>
> > > > > +
> > > > > +properties:
> > > > > +  compatible:
> > > > > +    items:
> > > > > +      - const: starfive,jh7100-gpio
> > > > > +
> > > > > +  reg:
> > > > > +    maxItems: 1
> > > > > +
> > > > > +  interrupts:
> > > > > +    description:
> > > > > +      Interrupt mapping, one per GPIO. Maximum 32 GPIOs.
> > > > > +    minItems: 1
> > > > > +    maxItems: 32
> > > >
> > > > What about clocks and resets?

> > > But I am not sure how reset would work?
> >
> > That should become "resets = <&rstgen JH7100_RSTN_GPIO_APB>",
> > but we don't have the reset controller in Linux yet (we do in barebox).
>
> Do you think I should add reset item like this?
>
>   resets:
>     maxItems: 1
>
> I suppose this is supposed to describe the hardware and it shouldn't
> matter whether or not Linux uses the property, right?

Exactly.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds