linux-kernel - Re: [PATCH 1/5] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Message-ID: <1b739216-8bb1-162b-1af5-24acba7324bf@gmail.com>
Date:   Wed, 14 Sep 2022 23:24:01 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     CK Hu <ck.hu@...iatek.com>, Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 1/5] dt-bindings: arm: mediatek: mmsys: change compatible
 for MT8195



On 14/09/2022 20:23, Jason-JH.Lin wrote:
> For previous MediaTek SoCs, such as MT8173, there are 2 display HW
> pipelines binding to 1 mmsys with the same power domain, the same
> clock driver and the same mediatek-drm driver.
> 
> For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines binding to
> 2 different power domains, different clock drivers and different
> mediatek-drm drivers.
> 
> Moreover, Hardware pipeline of VDOSYS0 has these components: COLOR,
> CCORR, AAL, GAMMA, DITHER. They are related to the PQ (Picture Quality)
> and they makes VDOSYS0 supports PQ function while they are not
> including in VDOSYS1.
> 
> Hardware pipeline of VDOSYS1 has the component ETHDR (HDR related
> component). It makes VDOSYS1 supports the HDR function while it's not
> including in VDOSYS0.
> 
> To summarize0:
> Only VDOSYS0 can support PQ adjustment.
> Only VDOSYS1 can support HDR adjustment.
> 
> Therefore, we need to separate these two different mmsys hardwares to
> 2 different compatibles for MT8195.
> 
> Fixes: 81c5a41d10b9 ("dt-bindings: arm: mediatek: mmsys: add mt8195 SoC binding")
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

I'm not sure Krzysztof gave his Acked-by tag.

> ---
>   .../devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml        | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> index 6ad023eec193..a53b32c0a608 100644
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> @@ -32,6 +32,8 @@ properties:
>                 - mediatek,mt8186-mmsys
>                 - mediatek,mt8192-mmsys
>                 - mediatek,mt8195-mmsys
> +              - mediatek,mt8195-vdosys0

As I said in the last submission, we should make mediatek,mt8195-mmsys as a 
fallback of vdosys0. Actually mediatek,mt8195-mmsys is only used for the 
fallback of vdosys0.

Regards,
Matthias

> +              - mediatek,mt8195-vdosys1
>                 - mediatek,mt8365-mmsys
>             - const: syscon
>         - items: