linux-kernel - Re: [PATCH 1/3] dt-bindings: mmc: imx-esdhc: Change imx8mn and imx8mp compatible fallback

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Date:   Wed, 23 Mar 2022 09:00:57 -0500
From:   Adam Ford <aford173@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     arm-soc <linux-arm-kernel@...ts.infradead.org>,
        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>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: imx-esdhc: Change imx8mn and imx8mp
 compatible fallback

On Wed, Mar 23, 2022 at 8:56 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On 23/03/2022 14:40, 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.
> >
> > Signed-off-by: Adam Ford <aford173@...il.com>
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> > index 7dbbcae9485c..d6ea73d76bdd 100644
> > --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> > +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> > @@ -39,14 +39,14 @@ properties:
> >        - items:
> >            - enum:
> >                - fsl,imx8mm-usdhc
>
> Your change looks reasonable, but why imx8mm is compatible with imx7d?

I saw that, and I wasn't sure the best way to go about  fixing it.  If
I move the 8mm out of the imx7d category, do I need to add it to the
enum list associated with the imx8mm, or can I just delete it from the
enum leaving the const for imx8mm good enough?

I am not very good with YAML files yet, so please forgive my ignorance.

adam
>
> > -              - fsl,imx8mn-usdhc
> > -              - fsl,imx8mp-usdhc
> >                - fsl,imx8mq-usdhc
> >                - fsl,imx8qm-usdhc
> >                - fsl,imx8qxp-usdhc
> >            - const: fsl,imx7d-usdhc
> >        - items:
> >            - enum:
> > +              - fsl,imx8mn-usdhc
> > +              - fsl,imx8mp-usdhc
> >                - fsl,imx93-usdhc
> >                - fsl,imx8ulp-usdhc
> >            - const: fsl,imx8mm-usdhc
>
>
> Best regards,
> Krzysztof