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From:   Alexandre Courbot <acourbot@chromium.org>
Date:   Wed, 3 Feb 2021 19:44:07 +0900
Message-ID: <CAPBb6MVqQ=gBb79Ey-n=WogXBC=Vr5iN7gwKPzVwLUu-9YkGRg@mail.gmail.com>
Subject: Re: [PATCH 1/3] dt-bindings: media: mtk-vcodec: Separating mtk vcodec
 encoder node
To:     Irui Wang <irui.wang@mediatek.com>
Cc:     Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Tiffany Lin <tiffany.lin@mediatek.com>,
        Andrew-CT Chen <andrew-ct.chen@mediatek.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Tomasz Figa <tfiga@google.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Maoguang Meng <maoguang.meng@mediatek.com>,
        Longfei Wang <longfei.wang@mediatek.com>,
        Yunfei Dong <yunfei.dong@mediatek.com>,
        Linux Media Mailing List <linux-media@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
        srv_heupstream@mediatek.com,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>
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On Thu, Jan 21, 2021 at 3:18 PM Irui Wang <irui.wang@mediatek.com> wrote:
>
> Updates binding document since the avc and vp8 hardware encoder in
> MT8173 are now separated. Separate "mediatek,mt8173-vcodec-enc" to
> "mediatek,mt8173-vcodec-vp8-enc" and "mediatek,mt8173-vcodec-avc-enc".
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> Signed-off-by: Maoguang Meng <maoguang.meng@mediatek.com>
> Signed-off-by: Irui Wang <irui.wang@mediatek.com>
>
> ---
>  .../bindings/media/mediatek-vcodec.txt        | 58 ++++++++++---------
>  1 file changed, 31 insertions(+), 27 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
> index 8217424fd4bd..f85276e629bf 100644
> --- a/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
> +++ b/Documentation/devicetree/bindings/media/mediatek-vcodec.txt
> @@ -4,7 +4,9 @@ Mediatek Video Codec is the video codec hw present in Mediatek SoCs which
>  supports high resolution encoding and decoding functionalities.
>
>  Required properties:
> -- compatible : "mediatek,mt8173-vcodec-enc" for MT8173 encoder
> +- compatible : must be one of the following string:
> +  "mediatek,mt8173-vcodec-vp8-enc" for mt8173 vp8 encoder.
> +  "mediatek,mt8173-vcodec-avc-enc" for mt8173 avc encoder.

IMHO "mediatek,mt8173-vcodec-enc-vp8" and
"mediatek,mt8173-vcodec-enc-avc" would be more logical. Also to keep a
bit of backward compatibility, shall we also allow
"mediatek,mt8173-vcodec-enc" to be an alias for
"mediatek,mt8173-vcodec-enc-avc"? The line above would become

  "mediatek,mt8173-vcodec-enc-avc" or "mediatek,mt8173-vcodec-enc" for
mt8173 avc encoder.

>    "mediatek,mt8183-vcodec-enc" for MT8183 encoder.
>    "mediatek,mt8173-vcodec-dec" for MT8173 decoder.
>  - reg : Physical base address of the video codec registers and length of
> @@ -13,10 +15,11 @@ Required properties:
>  - mediatek,larb : must contain the local arbiters in the current Socs.
>  - clocks : list of clock specifiers, corresponding to entries in
>    the clock-names property.
> -- clock-names: encoder must contain "venc_sel_src", "venc_sel",,
> -  "venc_lt_sel_src", "venc_lt_sel", decoder must contain "vcodecpll",
> -  "univpll_d2", "clk_cci400_sel", "vdec_sel", "vdecpll", "vencpll",
> -  "venc_lt_sel", "vdec_bus_clk_src".
> +- clock-names:
> +   avc venc must contain "venc_sel";
> +   vp8 venc must contain "venc_lt_sel";

Can't we use "venc_sel" for both avc and vp8, since they are different
nodes now? That way we can just say

  encoder must contain "venc_sel"

which is clearer and also simpler on the code side.

> +   decoder  must contain "vcodecpll", "univpll_d2", "clk_cci400_sel",
> +   "vdec_sel", "vdecpll", "vencpll", "venc_lt_sel", "vdec_bus_clk_src".
>  - iommus : should point to the respective IOMMU block with master port as
>    argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
>    for details.
> @@ -80,14 +83,10 @@ vcodec_dec: vcodec@16000000 {
>      assigned-clock-rates = <0>, <0>, <0>, <1482000000>, <800000000>;
>    };
>
> -  vcodec_enc: vcodec@18002000 {
> -    compatible = "mediatek,mt8173-vcodec-enc";
> -    reg = <0 0x18002000 0 0x1000>,    /*VENC_SYS*/
> -          <0 0x19002000 0 0x1000>;    /*VENC_LT_SYS*/
> -    interrupts = <GIC_SPI 198 IRQ_TYPE_LEVEL_LOW>,
> -                <GIC_SPI 202 IRQ_TYPE_LEVEL_LOW>;
> -    mediatek,larb = <&larb3>,
> -                   <&larb5>;
> +vcodec_enc: vcodec@18002000 {

Let's use vcodec_enc_avc as a label?

> +    compatible = "mediatek,mt8173-vcodec-avc-enc";
> +    reg = <0 0x18002000 0 0x1000>;
> +    interrupts = <GIC_SPI 198 IRQ_TYPE_LEVEL_LOW>;
>      iommus = <&iommu M4U_PORT_VENC_RCPU>,
>               <&iommu M4U_PORT_VENC_REC>,
>               <&iommu M4U_PORT_VENC_BSDMA>,
> @@ -98,8 +97,20 @@ vcodec_dec: vcodec@16000000 {
>               <&iommu M4U_PORT_VENC_REF_LUMA>,
>               <&iommu M4U_PORT_VENC_REF_CHROMA>,
>               <&iommu M4U_PORT_VENC_NBM_RDMA>,
> -             <&iommu M4U_PORT_VENC_NBM_WDMA>,
> -             <&iommu M4U_PORT_VENC_RCPU_SET2>,
> +             <&iommu M4U_PORT_VENC_NBM_WDMA>;
> +    mediatek,larb = <&larb3>;
> +    mediatek,vpu = <&vpu>;
> +    clocks = <&topckgen CLK_TOP_VENC_SEL>;
> +    clock-names = "venc_sel";
> +    assigned-clocks = <&topckgen CLK_TOP_VENC_SEL>;
> +    assigned-clock-parents = <&topckgen CLK_TOP_VCODECPLL>;
> +  };
> +
> +vcodec_enc_lt: vcodec@19002000 {

And here the label should probably be "vcodec_enc_vp8" for consistency.


> +    compatible = "mediatek,mt8173-vcodec-vp8-enc";
> +    reg =  <0 0x19002000 0 0x1000>;    /* VENC_LT_SYS */
> +    interrupts = <GIC_SPI 202 IRQ_TYPE_LEVEL_LOW>;
> +    iommus = <&iommu M4U_PORT_VENC_RCPU_SET2>,
>               <&iommu M4U_PORT_VENC_REC_FRM_SET2>,
>               <&iommu M4U_PORT_VENC_BSDMA_SET2>,
>               <&iommu M4U_PORT_VENC_SV_COMA_SET2>,
> @@ -108,17 +119,10 @@ vcodec_dec: vcodec@16000000 {
>               <&iommu M4U_PORT_VENC_CUR_CHROMA_SET2>,
>               <&iommu M4U_PORT_VENC_REF_LUMA_SET2>,
>               <&iommu M4U_PORT_VENC_REC_CHROMA_SET2>;
> +    mediatek,larb = <&larb5>;
>      mediatek,vpu = <&vpu>;
> -    clocks = <&topckgen CLK_TOP_VENCPLL_D2>,
> -             <&topckgen CLK_TOP_VENC_SEL>,
> -             <&topckgen CLK_TOP_UNIVPLL1_D2>,
> -             <&topckgen CLK_TOP_VENC_LT_SEL>;
> -    clock-names = "venc_sel_src",
> -                  "venc_sel",
> -                  "venc_lt_sel_src",
> -                  "venc_lt_sel";
> -    assigned-clocks = <&topckgen CLK_TOP_VENC_SEL>,
> -                      <&topckgen CLK_TOP_VENC_LT_SEL>;
> -    assigned-clock-parents = <&topckgen CLK_TOP_VENCPLL_D2>,
> -                             <&topckgen CLK_TOP_UNIVPLL1_D2>;
> +    clocks = <&topckgen CLK_TOP_VENC_LT_SEL>;
> +    clock-names = "venc_lt_sel";
> +    assigned-clocks = <&topckgen CLK_TOP_VENC_LT_SEL>;
> +    assigned-clock-parents = <&topckgen CLK_TOP_VCODECPLL_370P5>;
>    };
> --
> 2.18.0
>