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

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Date:   Thu, 25 Aug 2022 12:56:32 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     jason-jh.lin@...iatek.com, nancy.lin@...iatek.com,
        ck.hu@...iatek.com, chunkuang.hu@...nel.org,
        angelogioacchino.delregno@...labora.com, hsinyi@...gle.com,
        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
Subject: Re: [PATCH] dt-bindings: arm: mediatek: mmsys: change compatible for
 MT8195



On 25/08/2022 07:56, Bo-Chen Chen wrote:
> From: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
> 
> 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.
> 
> 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>
> ---
>   .../devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml       | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> index 6ad023eec193..bfbdd30d2092 100644
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> @@ -31,7 +31,8 @@ properties:
>                 - mediatek,mt8183-mmsys
>                 - mediatek,mt8186-mmsys
>                 - mediatek,mt8192-mmsys
> -              - mediatek,mt8195-mmsys
> +              - mediatek,mt8195-vdosys0
> +              - mediatek,mt8195-vdosys1

If I understand correctly support for vdosys0 is merged with the old compatible. 
We should therefore keep mediatek,mt8195-mmsys as a fallback for 
mediatek,mt8195-vdosys0.

Regards,
Matthias


>                 - mediatek,mt8365-mmsys
>             - const: syscon
>         - items: