linux-kernel - Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT Binding doc for soc unique ID

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Date:   Sat, 14 Nov 2020 17:49:36 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Alice Guo <alice.guo@....com>
Cc:     robh+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        linux-imx@....com, peng.fan@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/4] dt-bindings: soc: imx8m: add DT Binding doc for
 soc unique ID

On Fri, Nov 13, 2020 at 07:04:06PM +0800, Alice Guo wrote:
> Add DT Binding doc for the Unique ID of i.MX 8M series.
> 
> Signed-off-by: Alice Guo <alice.guo@....com>
> ---
>  .../devicetree/bindings/arm/fsl.yaml          | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
> index e4db0f9ed664..f4faebbb57da 100644
> --- a/Documentation/devicetree/bindings/arm/fsl.yaml
> +++ b/Documentation/devicetree/bindings/arm/fsl.yaml
> @@ -901,6 +901,31 @@ properties:
>                - fsl,s32v234-evb           # S32V234-EVB2 Customer Evaluation Board
>            - const: fsl,s32v234
> 
> +  soc:
> +    type: object
> +    properties:
> +      compatible:
> +        oneOf:
> +          - description: i.MX8M SoCs
> +            items:
> +              - enum:
> +                  - fsl,imx8mm-soc
> +                  - fsl,imx8mn-soc
> +                  - fsl,imx8mp-soc
> +                  - fsl,imx8mq-soc
> +              - const: simple-bus
> +
> +          - description: Other SoCs
> +            items:
> +              - const: simple-bus
> +
> +      nvmem-cells:
> +        maxItems: 1
> +        description: Phandle to the SOC Unique ID provided by a nvmem node
> +
> +      nvmem-cells-names:
> +        const: soc_unique_id
> +
>  additionalProperties: true

The "soc" node should be required for these compatibles. Otherwise you
will have to stay with this
backwards-compatible-DTB-device-initcall-glue for many years... I think
you can achieve it with allOf.

Best regards,
Krzysztof