linux-kernel - Re: [v2 2/3] dt-bindings: ARM: Mediatek: Remove vppsys in MT8195 clock document

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Date:   Tue, 15 Feb 2022 17:50:11 +0800
From:   Chun-Jie Chen <chun-jie.chen@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [v2 2/3] dt-bindings: ARM: Mediatek: Remove vppsys in MT8195
 clock document

On Fri, 2022-01-21 at 17:35 -0600, Rob Herring wrote:
> On Mon, Jan 10, 2022 at 08:59:01AM +0800, Chun-Jie Chen wrote:
> > vppsys0 and vppsys1 sub-system are both integrated with mmsys
> > driver,
> > should be describe in mediatek,mmsys.yaml
> 
> Driver partitioning is not a reason to change the DT. This needs a 
> better description answering why you are doing this and what are the 
> implications (is this breaking the ABI?).


Due to the change in [1], vppsys0/vppsys1 are not only clock providers
and support mm system control. It's better to be described in
"mediatek,mmsys.yaml" [2] because they are not pure clock providers.

[1] 
https://patchwork.kernel.org/project/linux-mediatek/patch/20220117055254.9777-4-roy-cw.yeh@mediatek.com/
[2] 
https://patchwork.kernel.org/project/linux-mediatek/patch/20220117055254.9777-15-roy-cw.yeh@mediatek.com/

Thanks!
Best Regards,
Chun-Jie
> > 
> > Signed-off-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> > ---
> >  .../arm/mediatek/mediatek,mt8195-clock.yaml      | 16 ------------
> > ----
> >  1 file changed, 16 deletions(-)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt8195-
> > clock.yaml
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt8195-
> > clock.yaml
> > index 17fcbb45d121..d62d60181147 100644
> > ---
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt8195-
> > clock.yaml
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt8195-
> > clock.yaml
> > @@ -28,11 +28,9 @@ properties:
> >            - mediatek,mt8195-imp_iic_wrap_s
> >            - mediatek,mt8195-imp_iic_wrap_w
> >            - mediatek,mt8195-mfgcfg
> > -          - mediatek,mt8195-vppsys0
> >            - mediatek,mt8195-wpesys
> >            - mediatek,mt8195-wpesys_vpp0
> >            - mediatek,mt8195-wpesys_vpp1
> > -          - mediatek,mt8195-vppsys1
> >            - mediatek,mt8195-imgsys
> >            - mediatek,mt8195-imgsys1_dip_top
> >            - mediatek,mt8195-imgsys1_dip_nr
> > @@ -92,13 +90,6 @@ examples:
> >          #clock-cells = <1>;
> >      };
> >  
> > -  - |
> > -    vppsys0: clock-controller@...00000 {
> > -        compatible = "mediatek,mt8195-vppsys0";
> > -        reg = <0x14000000 0x1000>;
> > -        #clock-cells = <1>;
> > -    };
> > -
> >    - |
> >      wpesys: clock-controller@...00000 {
> >          compatible = "mediatek,mt8195-wpesys";
> > @@ -120,13 +111,6 @@ examples:
> >          #clock-cells = <1>;
> >      };
> >  
> > -  - |
> > -    vppsys1: clock-controller@...00000 {
> > -        compatible = "mediatek,mt8195-vppsys1";
> > -        reg = <0x14f00000 0x1000>;
> > -        #clock-cells = <1>;
> > -    };
> > -
> >    - |
> >      imgsys: clock-controller@...00000 {
> >          compatible = "mediatek,mt8195-imgsys";
> > -- 
> > 2.18.0
> > 
> >