linux-kernel - Re: [PATCH] dt-bindings: media: mtk-vcodec: Adds encoder power domain property

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Date:   Tue, 26 Apr 2022 15:37:07 -0500
From:   Rob Herring <robh@...nel.org>
To:     Irui Wang <irui.wang@...iatek.com>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Longfei Wang <longfei.wang@...iatek.com>,
        allen-kh.cheng@...iatek.com, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, srv_heupstream@...iatek.com,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH] dt-bindings: media: mtk-vcodec: Adds encoder power
 domain property

On Wed, Apr 20, 2022 at 03:34:39PM +0800, Irui Wang wrote:
> Adds encoder power domain property

Why? You can't add new, required properties as that breaks compatibility 
with existing DTs.

> 
> Signed-off-by: Irui Wang <irui.wang@...iatek.com>
> ---
>  .../devicetree/bindings/media/mediatek,vcodec-encoder.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> index deb5b657a2d5..3c069c965992 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> @@ -41,6 +41,9 @@ properties:
>  
>    assigned-clock-parents: true
>  
> +  power-domains:
> +    maxItems: 1
> +
>    iommus:
>      minItems: 1
>      maxItems: 32
> @@ -72,6 +75,7 @@ required:
>    - iommus
>    - assigned-clocks
>    - assigned-clock-parents
> +  - power-domains
>  
>  allOf:
>    - if:
> @@ -132,6 +136,7 @@ examples:
>      #include <dt-bindings/clock/mt8173-clk.h>
>      #include <dt-bindings/memory/mt8173-larb-port.h>
>      #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/power/mt8173-power.h>
>  
>      vcodec_enc_avc: vcodec@...02000 {
>        compatible = "mediatek,mt8173-vcodec-enc";
> @@ -153,6 +158,7 @@ examples:
>        clock-names = "venc_sel";
>        assigned-clocks = <&topckgen CLK_TOP_VENC_SEL>;
>        assigned-clock-parents = <&topckgen CLK_TOP_VCODECPLL>;
> +      power-domains = <&scpsys MT8173_POWER_DOMAIN_VENC>;
>      };
>  
>      vcodec_enc_vp8: vcodec@...02000 {
> @@ -173,4 +179,5 @@ examples:
>        clock-names = "venc_lt_sel";
>        assigned-clocks = <&topckgen CLK_TOP_VENC_LT_SEL>;
>        assigned-clock-parents = <&topckgen CLK_TOP_VCODECPLL_370P5>;
> +      power-domains = <&scpsys MT8173_POWER_DOMAIN_VENC_LT>;
>      };
> -- 
> 2.18.0
> 
>