linux-kernel - Re: [v2,4/4] dt-bindings: pwm: Add compatible for MediaTek MT8186

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Message-ID: <CAGXv+5GWJOFjePKJ5ABnYP2eXeU0PM6Yo3b3vYmErUnDY4=ZQQ@mail.gmail.com>
Date:   Fri, 25 Feb 2022 14:26:29 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     "xinlei.lee" <xinlei.lee@...iatek.com>
Cc:     Rob Herring <robh@...nel.org>, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de, lee.jones@...aro.org,
        matthias.bgg@...il.com, jitao.shi@...iatek.com,
        allen-kh.cheng@...iatek.com, linux-pwm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Xinlei Lee <xinlei.lee@...iatek.corp-partner.google.com>
Subject: Re: [v2,4/4] dt-bindings: pwm: Add compatible for MediaTek MT8186

On Fri, Feb 25, 2022 at 2:18 PM xinlei.lee <xinlei.lee@...iatek.com> wrote:
>
> On Thu, 2022-02-24 at 15:19 -0600, Rob Herring wrote:
> > On Wed, Feb 16, 2022 at 05:32:51PM +0800, xinlei.lee@...iatek.com
> > wrote:
> > > From: Xinlei Lee <xinlei.lee@...iatek.corp-partner.google.com>
> > >
> > > Add dt-binding documentation of pwm for MediaTek MT8186 SoC.
> > >
> > > Signed-off-by: Xinlei Lee <
> > > xinlei.lee@...iatek.corp-partner.google.com>
> > > ---
> > >  Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/pwm/mediatek,pwm-
> > > disp.yaml b/Documentation/devicetree/bindings/pwm/mediatek,pwm-
> > > disp.yaml
> > > index 768ab04d3764..1f45b1b8c3d4 100755
> > > --- a/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
> > > +++ b/Documentation/devicetree/bindings/pwm/mediatek,pwm-disp.yaml
> > > @@ -17,6 +17,7 @@ properties:
> > >        - mediatek,mt6595-disp-pwm
> > >        - mediatek,mt8173-disp-pwm
> > >        - mediatek,mt8183-disp-pwm
> > > +      - mediatek,mt8186-disp-pwm
> > >        - mediatek,mt8192-disp-pwm
> > >        - mediatek,mt8195-disp-pwm
> >
> > It seems unlikely that every SoC has a different version of h/w for
> > something as simple as a PWM. There's not an appropriate fallback?
> > The
> > first version from an SoC that has all the features and would work
> > with
> > existing driver unchanged?
> >
> > Rob
>
> Hi Rob:
>
> Thanks for your suggestion,I agree with your point of view.
> If I want to show that different socs are using this disp_pwm, can I
> use oneOf with items to achieve this, and reuse the compatiable that is
> currently included in the pwm_mtk_disp.c file.
> E.g:
> - items:
>        - enum:
>            -mediatek,mt8186-disp-pwm
>        - enum:
>            -mediatek,mt8183-disp-pwm
> What's your suggestion for this program?

Using Documentation/devicetree/bindings/mmc/mtk-sd.yaml as a reference,
you would have:
  compatible:
    oneOf:
      - enum:
        - mediatek,mt6595-disp-pwm
        - mediatek,mt8173-disp-pwm
        - mediatek,mt8183-disp-pwm
      - items:
        - const: mediatek,mt8186-disp-pwm
        - const: mediatek,mt8183-disp-pwm
      ...

ChenYu


> Best Regards!
> xinlei
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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