Subject: Re: [PATCH v2 1/8] dt-bindings: mmc: Document support for nvmem-layout

From: Rob Herring <[email-masked]>
Date: Wed, 13 May 2026 17:42:17 -0500

On Thu, May 07, 2026 at 05:24:36PM +0200, Loic Poulain wrote:
> Add support for an nvmem-layout subnode under an eMMC hardware
> partition. This allows the partition to be exposed as an NVMEM
> provider and its internal layout to be described. For example,
> an eMMC boot partition can be used to store device-specific
> information such as a WiFi MAC address.
> 
> Signed-off-by: Loic Poulain <[email-masked]>
> ---
>  .../devicetree/bindings/mmc/mmc-card.yaml          | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.yaml b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> index a61d6c96df759102f9c1fbfd548b026a77921cae..b21426a49cf1d9aae5b4e8e447b5be11b08c96bf 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> @@ -40,6 +40,9 @@ patternProperties:
>          contains:
>            const: fixed-partitions
>  
> +      nvmem-layout:
> +        $ref: /schemas/nvmem/layouts/nvmem-layout.yaml
> +
>  required:
>    - compatible
>    - reg
> @@ -86,6 +89,27 @@ examples:
>                      read-only;
>                  };
>              };
> +
> +            partitions-boot2 {

Shouldn't this have a 'fixed-partitions' compatible? I'm not sure if 
it's an oversight in the schema that 'compatible' is not required here. 
It would be odd that compatible is optional, but if it is present, it 
must contain 'fixed-partitions' compatible. A follow-up to fix that 
would be great.

Reviewed-by: Rob Herring (Arm) <[email-masked]>

Rob