linux-kernel - Re: [PATCH 01/10] dt-bindings: media: mediatek,vcodec: Remove dma-ranges property

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Message-ID: <07ecf7cf-4a68-0f80-0452-3737b7d7922d@linaro.org>
Date:   Fri, 13 Jan 2023 09:25:58 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>, nfraprado@...labora.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        mingyuan.ma@...iatek.com, yf.wang@...iatek.com,
        libo.kang@...iatek.com, Yunfei Dong <yunfei.dong@...iatek.com>,
        kyrie wu <kyrie.wu@...iatek.corp-partner.google.com>,
        chengci.xu@...iatek.com, youlin.pei@...iatek.com,
        anan.sun@...iatek.com, Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>
Subject: Re: [PATCH 01/10] dt-bindings: media: mediatek,vcodec: Remove
 dma-ranges property

On 13/01/2023 07:01, Yong Wu wrote:
> MediaTek iommu has already controlled the masters' iova ranges by the
> master's larb/port id. then the dma-ranges property is unnecessary for

Sentences in English always start with a capital letter, however also
they do not start with "Then". Make it a proper a proper sentence.

> the master's node. the master is vcodec here.

Unnecessary or invalid? Don't you depend now on some feature of driver
added for example recently?

> 
> Cc: Tiffany Lin <tiffany.lin@...iatek.com>
> Cc: Andrew-CT Chen <andrew-ct.chen@...iatek.com>
> Cc: Yunfei Dong <yunfei.dong@...iatek.com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>

There is little point in storing output of get_maintainers.pl forever in
the git log. If you need it for some reason, please keep it after ---.

> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  .../devicetree/bindings/media/mediatek,vcodec-decoder.yaml | 5 -----
>  .../devicetree/bindings/media/mediatek,vcodec-encoder.yaml | 5 -----
>  .../bindings/media/mediatek,vcodec-subdev-decoder.yaml     | 7 -------
>  3 files changed, 17 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> index aa55ca65d6ed..fad59b486d5d 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-decoder.yaml
> @@ -56,11 +56,6 @@ properties:
>        List of the hardware port in respective IOMMU block for current Socs.
>        Refer to bindings/iommu/mediatek,iommu.yaml.
>  
> -  dma-ranges:
> -    maxItems: 1
> -    description: |
> -      Describes the physical address space of IOMMU maps to memory.
> -
>    mediatek,vpu:
>      $ref: /schemas/types.yaml#/definitions/phandle
>      description:
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> index 0f2ea8d9a10c..a2051b31fa29 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml
> @@ -49,11 +49,6 @@ properties:
>        List of the hardware port in respective IOMMU block for current Socs.
>        Refer to bindings/iommu/mediatek,iommu.yaml.
>  
> -  dma-ranges:
> -    maxItems: 1
> -    description: |
> -      Describes the physical address space of IOMMU maps to memory.
> -
>    mediatek,vpu:
>      $ref: /schemas/types.yaml#/definitions/phandle
>      description:
> diff --git a/Documentation/devicetree/bindings/media/mediatek,vcodec-subdev-decoder.yaml b/Documentation/devicetree/bindings/media/mediatek,vcodec-subdev-decoder.yaml
> index c4f20acdc1f8..290594bc91cc 100644
> --- a/Documentation/devicetree/bindings/media/mediatek,vcodec-subdev-decoder.yaml
> +++ b/Documentation/devicetree/bindings/media/mediatek,vcodec-subdev-decoder.yaml
> @@ -76,11 +76,6 @@ properties:
>        The node of system control processor (SCP), using
>        the remoteproc & rpmsg framework.
>  
> -  dma-ranges:
> -    maxItems: 1
> -    description: |
> -      Describes the physical address space of IOMMU maps to memory.
> -
>    "#address-cells":
>      const: 2
>  
> @@ -203,7 +198,6 @@ required:
>    - reg
>    - iommus
>    - mediatek,scp
> -  - dma-ranges
>    - ranges
>  
>  if:
> @@ -236,7 +230,6 @@ examples:
>              compatible = "mediatek,mt8192-vcodec-dec";
>              mediatek,scp = <&scp>;
>              iommus = <&iommu0 M4U_PORT_L4_VDEC_MC_EXT>;
> -            dma-ranges = <0x1 0x0 0x0 0x40000000 0x0 0xfff00000>;
>              #address-cells = <2>;
>              #size-cells = <2>;
>              ranges = <0 0 0 0x16000000 0 0x40000>;

Best regards,
Krzysztof