linux-kernel - Re: [PATCH V3 1/3] dt-bindings: mmc: imx-esdhc: Update compatible fallbacks

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Date:   Sat, 2 Apr 2022 22:12:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Adam Ford <aford173@...il.com>, linux-mmc@...r.kernel.org
Cc:     haibo.chen@....com, aford@...conembedded.com,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/3] dt-bindings: mmc: imx-esdhc: Update compatible
 fallbacks

On 02/04/2022 21:39, Adam Ford wrote:
> The SDHC controller in the imx8mn and imx8mp have the same controller
> as the imx8mm which is slightly different than that of the imx7d.
> Using the fallback of the imx8mm enables the controllers to support
> HS400-ES which is not available on the imx7d. After discussion with NXP,
> it turns out that the imx8qm should fall back to the imx8qxp, because
> those have some additional flags not present in the imx8mm.
> 
> Suggested-by: haibo.chen@....com
> Signed-off-by: Adam Ford <aford173@...il.com>
> ---
> V3:  Marked the imx7d-usdhc as deprecated when there are better
>      fallback options or the fallback isn't needed.
>      Leave the deprecated fallback in the YAML to prevent errors
>      Remove Reviewed-by from Krzysztof Kozlowski due to the above
> 
> V2:  Update the table per recomendation from Haibo.
> 
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> index 7dbbcae9485c..11f039320d79 100644
> --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> @@ -34,23 +34,34 @@ properties:
>            - fsl,imx6ull-usdhc
>            - fsl,imx7d-usdhc
>            - fsl,imx7ulp-usdhc
> +          - fsl,imx8mm-usdhc
> +          - fsl,imx8qxp-usdhc
>            - fsl,imxrt1050-usdhc
>            - nxp,s32g2-usdhc
>        - items:
>            - enum:
>                - fsl,imx8mm-usdhc
> +              - fsl,imx8mq-usdhc
> +            # fsl,imx7d-usdhc fallback is deprecated for imx8mm-usdhc
> +          - const: fsl,imx7d-usdhc

Instead of comment use (I think on the same level as items):

deprecated: true

> +      - items:
> +          - enum:
>                - fsl,imx8mn-usdhc
>                - fsl,imx8mp-usdhc

So if this is a deprecated list, where is a proper one? The list with
this enum + imx8mm?

IOW, you need to list here:
1. Old combinations with "deprecated: true"
2. New combinations.

> -              - fsl,imx8mq-usdhc
> -              - fsl,imx8qm-usdhc
> -              - fsl,imx8qxp-usdhc
> +          - const: fsl,imx8mm-usdhc
> +            # fsl,imx7d-usdhc fallback is deprecated
>            - const: fsl,imx7d-usdhc
>        - items:
>            - enum:
> -              - fsl,imx93-usdhc
>                - fsl,imx8ulp-usdhc
> +              - fsl,imx93-usdhc
>            - const: fsl,imx8mm-usdhc
> -
> +      - items:
> +          - enum:
> +              - fsl,imx8qm-usdhc
> +          - const: fsl,imx8qxp-usdhc
> +            # fsl,imx7d-usdhc fallback is deprecated
> +          - const: fsl,imx7d-usdhc
>    reg:
>      maxItems: 1
>  


Best regards,
Krzysztof