linux-kernel - Re: [PATCH v4 1/7] dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183

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Date:   Fri, 6 Mar 2020 10:43:35 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Nick Fan <nick.fan@...iatek.com>
Cc:     Rob Herring <robh@...nel.org>, Sj Huang <sj.huang@...iatek.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v4 1/7] dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183

On Fri, Mar 6, 2020 at 10:34 AM Nick Fan <nick.fan@...iatek.com> wrote:
>
> Sorry for my late reply.
> I have checked internally.
> The MT8183_POWER_DOMAIN_MFG_2D is just a legacy name, not really 2D
> domain.
>
> If the naming too confusing, we can change this name to
> MT8183_POWER_DOMAIN_MFG_CORE2 for consistency.

Thanks! I think I'll keep MT8183_POWER_DOMAIN_MFG_2D (that's fine if
that's the domain name you use internally in your HW design), but I'll
modify power-domain-names to core0/1/2 in the binding.

> Thanks
>
> Nick Fan
>
> On Wed, 2020-02-26 at 08:55 +0800, Nicolas Boichat wrote:
>
> > +Nick Fan +Sj Huang @ MTK
> >
> > On Wed, Feb 26, 2020 at 1:16 AM Rob Herring <robh@...nel.org> wrote:
> > >
> > > On Fri, Feb 07, 2020 at 01:26:21PM +0800, Nicolas Boichat wrote:
> > > > Define a compatible string for the Mali Bifrost GPU found in
> > > > Mediatek's MT8183 SoCs.
> > > >
> > > > Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
> > > > Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
> > > > ---
> > > >
> > > > v4:
> > > >  - Add power-domain-names description
> > > >    (kept Alyssa's reviewed-by as the change is minor)
> > > > v3:
> > > >  - No change
> > > >
> > > >  .../bindings/gpu/arm,mali-bifrost.yaml        | 25 +++++++++++++++++++
> > > >  1 file changed, 25 insertions(+)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> > > > index 4ea6a8789699709..0d93b3981445977 100644
> > > > --- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> > > > +++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> > > > @@ -17,6 +17,7 @@ properties:
> > > >      items:
> > > >        - enum:
> > > >            - amlogic,meson-g12a-mali
> > > > +          - mediatek,mt8183-mali
> > > >            - realtek,rtd1619-mali
> > > >            - rockchip,px30-mali
> > > >        - const: arm,mali-bifrost # Mali Bifrost GPU model/revision is fully discoverable
> > > > @@ -62,6 +63,30 @@ allOf:
> > > >            minItems: 2
> > > >        required:
> > > >          - resets
> > > > +  - if:
> > > > +      properties:
> > > > +        compatible:
> > > > +          contains:
> > > > +            const: mediatek,mt8183-mali
> > > > +    then:
> > > > +      properties:
> > > > +        sram-supply: true
> > > > +        power-domains:
> > > > +          description:
> > > > +            List of phandle and PM domain specifier as documented in
> > > > +            Documentation/devicetree/bindings/power/power_domain.txt
> > > > +          minItems: 3
> > > > +          maxItems: 3
> > > > +        power-domain-names:
> > > > +          items:
> > > > +            - const: core0
> > > > +            - const: core1
> > > > +            - const: 2d
> > >
> > > AFAIK, there's no '2d' block in bifrost GPUs. A power domain for each
> > > core group is correct though.
> >
> > Good question... Hopefully Nick/SJ@MTK can comment, the non-upstream DTS has:
> > gpu: mali@...40000 {
> > compatible = "mediatek,mt8183-mali", "arm,mali-bifrost";
> > power-domains = <&scpsys MT8183_POWER_DOMAIN_MFG_CORE0>;
> > ...
> > }
> >
> > gpu_core1: mali_gpu_core1 {
> > compatible = "mediatek,gpu_core1";
> > power-domains = <&scpsys MT8183_POWER_DOMAIN_MFG_CORE1>;
> > };
> >
> > gpu_core2: mali_gpu_core2 {
> > compatible = "mediatek,gpu_core2";
> > power-domains = <&scpsys MT8183_POWER_DOMAIN_MFG_2D>;
> > };
> >
> > So I picked core0/core1/2d as names, but looking at this, it's likely
> > core2 is more appropriate (and MT8183_POWER_DOMAIN_MFG_2D might just
> > be a internal/legacy name, if there is no real 2d domain).
> >
> > Thanks.
> >
> > > Rob
>