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

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Date:   Sun, 10 Apr 2022 09:36:34 -0500
From:   Adam Ford <aford173@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Haibo Chen <haibo.chen@....com>,
        Adam Ford-BE <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 <devicetree@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 1/3] dt-bindings: mmc: imx-esdhc: Update compatible fallbacks

On Sat, Apr 2, 2022 at 3:12 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> 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

I have tried various combinations of where to place "deprecated" and
whether or not to use a hyphen, but I always get syntax errors.  Do
you have an example of this I can see?

adam
>
> > +      - 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