linux-kernel - Re: [PATCH v13 1/2] dt-bindings: mmc: mtk-sd: increase reg items

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Date:   Thu, 31 Mar 2022 12:54:16 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Tinghan Shen <tinghan.shen@...iatek.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Wenbin Mei <wenbin.mei@...iatek.com>
Cc:     linux-mmc@...r.kernel.org, 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,
        ryder.lee@...nel.org, wenst@...omium.org, chunfeng.yun@...iatek.com
Subject: Re: [PATCH v13 1/2] dt-bindings: mmc: mtk-sd: increase reg items



On 30/03/2022 11:45, Tinghan Shen wrote:
> MediaTek has a new version of mmc IP since mt8183. Some IO registers
> are moved to top to improve hardware design and named as "host top
> registers".
> 
> Add host top register in the reg binding description for mt8183 and
> successors.
> 
> Signed-off-by: Wenbin Mei <wenbin.mei@...iatek.com>
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
>   Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 15 ++++++++++++++-
>   1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> index 297ada03e3de..2a2e9fa8c188 100644
> --- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> @@ -40,7 +40,10 @@ properties:
>             - const: mediatek,mt8183-mmc
>   
>     reg:
> -    maxItems: 1
> +    minItems: 1

 From my understanding adding minItems is correct, but you need to add also 
maxItems: 2 as there can't be more then two register entries.

Regards,
Matthias

> +    items:
> +      - description: base register (required).
> +      - description: top base register (required for MT8183).
>   
>     clocks:
>       description:
> @@ -168,6 +171,16 @@ required:
>     - vmmc-supply
>     - vqmmc-supply
>   
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        const: mediatek,mt8183-mmc
> +then:
> +  properties:
> +    reg:
> +      minItems: 2
> +
>   unevaluatedProperties: false
>   
>   examples: