linux-kernel - Re: [PATCH v3 3/6] media: dt-bindings: mediatek,vcodec: Remove VDEC

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Message-ID: <8b5e4a9b-7496-02a1-d3b6-a0be8ea85798@linaro.org>
Date:   Tue, 20 Jun 2023 10:12:14 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, kernel@...labora.com,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 3/6] media: dt-bindings: mediatek,vcodec: Remove
 VDEC_SYS for mt8183

On 20/06/2023 02:03, Nícolas F. R. A. Prado wrote:
> The binding expects the first register space to be VDEC_SYS. But on
> mt8183, which uses the stateless decoders, this space is used only for
> controlling clocks and resets, which are better described as separate
> clock-controller and reset-controller nodes.
> 
> In fact, in mt8173's devicetree there are already such separate
> clock-controller nodes, which cause duplicate addresses between the
> vdecsys node and the vcodec node. But for this SoC, since the stateful
> decoder code makes other uses of the VDEC_SYS register space, it's not
> straightforward to remove it.
> 
> In order to avoid the same address conflict to happen on mt8183,
> since the only current use of the VDEC_SYS register space in
> the driver is to read the status of a hardware controlled clock, remove
> the VDEC_SYS register space from the binding and describe an extra
> syscon that will be used to directly check the hardware status.
> 
> Also add reg-names to be able to tell that this new register schema is
> used, so the driver can keep backward compatibility.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 
> ---
> I dropped the tags from this commit since a syscon is now used instead
> of an extra clock.
> 
> Changes in v3:
> - Removed the active clock
> - Added a mediatek,vdecsys syscon property
> 
> Changes in v2:
> - Merged with patch 1 (media: dt-bindings: mediatek,vcodec: Allow single
>   clock for mt8183) to avoid changing number of clocks twice
> - Added maxItems to reg-names
> - Constrained clocks for each compatible
> - Reordered properties for each compatible
> 
>  .../media/mediatek,vcodec-decoder.yaml        | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> index 1e56ece44aee..2f625c50bbfe 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> @@ -21,8 +21,13 @@ properties:
>        - mediatek,mt8183-vcodec-dec
>  
>    reg:
> +    minItems: 11
>      maxItems: 12
>  
> +  reg-names:
> +    minItems: 11
> +    maxItems: 11

maxItems: 12

> +
>    interrupts:
>      maxItems: 1
>  
> @@ -60,6 +65,10 @@ properties:
>      description:
>        Describes point to scp.
>  
> +  mediatek,vdecsys:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to the vdecsys syscon node.
> +
>  required:
>    - compatible
>    - reg
> @@ -79,8 +88,26 @@ allOf:
>      then:
>        required:
>          - mediatek,scp
> +        - mediatek,vdecsys
>  
>        properties:
> +        reg:
> +          maxItems: 11
> +
> +        reg-names:
> +          items:
> +            - const: misc
> +            - const: ld
> +            - const: top
> +            - const: cm
> +            - const: ad
> +            - const: av
> +            - const: pp
> +            - const: hwd
> +            - const: hwq
> +            - const: hwb
> +            - const: hwg
> +
>          clocks:
>            minItems: 1
>            maxItems: 1
> @@ -101,6 +128,9 @@ allOf:
>          - mediatek,vpu
>  
>        properties:
> +        reg:
> +          minItems: 12


What about reg-names here? They should be also defined and in sync with
regs.

Best regards,
Krzysztof