linux-kernel - Re: [PATCH v16 3/8] dt-bindings: arm: mediatek: mmsys: add mt8195 SoC binding

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Date:   Mon, 28 Mar 2022 11:29:24 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <hsinyi@...omium.org>, <fshao@...omium.org>,
        <moudy.ho@...iatek.com>, <roy-cw.yeh@...iatek.com>,
        Fabien Parent <fparent@...libre.com>, <nancy.lin@...iatek.com>,
        <singo.chang@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v16 3/8] dt-bindings: arm: mediatek: mmsys: add mt8195
 SoC binding

Hi CK,

Thanks for the reviews.

On Fri, 2022-03-18 at 14:43 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-03-07 at 11:28 +0800, jason-jh.lin wrote:
> > There are 2 mmsys, namely vdosys0 and vdosys1 in mt8195.
> > Each of them is bound to a display pipeline, so add their
> > definition in mtk-mmsys documentation with 2 compatibles.
> 
> Could one vdosys be union of vdosys0 and vdosys1? In MT8173, one
> mmsys
> support multiple pipeline. Describe more in commit message to support
> that two vdosys are necessary.
> 
> Regards,
> CK
> 

In the SoC before, such as mt8173, it has 2 pipelines binding to one
mmsys with the same clock driver and the same power domain.

In mt8195, 2 pipelines are binding to different mmsys, such as vdosys0
and vdosys1. Each mmsys uses different clock drivers and different
power domain.

Since each mmsys has its own clock, I have tried to differentiate
vppsys0, vppsys1, vdosys0, vdosys1 by the clock names.
Then I can use one mmsys compatible name for all of them.

I'll apply this method at the next version.
And also sync with Nancy(vdosys1) and Roy(vppsys0, vppsys1).

Regards,
Jason-JH.Lin

> > 
> > Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> > ---
> >  .../devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml        |
> > 2
> > ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > index 6c2c3edcd443..c5ba515cb0d7 100644
> > ---
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > @@ -32,6 +32,8 @@ properties:
> >                - mediatek,mt8186-mmsys
> >                - mediatek,mt8192-mmsys
> >                - mediatek,mt8365-mmsys
> > +              - mediatek,mt8195-vdosys0
> > +              - mediatek,mt8195-vdosys1
> >            - const: syscon
> >        - items:
> >            - const: mediatek,mt7623-mmsys
> 
> 
-- 
Jason-JH Lin <jason-jh.lin@...iatek.com>