Re: [PATCH v8 1/9] dt-bindings: mmc: Document fixed-layout NVMEM provider support

[Ulf Hansson]

- trimmed the cc-list

On Fri, Jul 3, 2026 at 3:45 PM Loic Poulain
<loic.poulain@xxxxxxxxxxxxxxxx> wrote:
>
> Allow an eMMC hardware partition node to describe an NVMEM layout so the
> partition can be exposed as an NVMEM provider. This lets a partition
> (e.g. an eMMC boot partition) store device-specific information such as a
> WiFi MAC address or a Bluetooth BD address and reference it through NVMEM
> cells.
>
> Accept "fixed-layout" as the partition node compatible, in addition to
> "fixed-partitions", so the layout can be described directly on the
> partition node.
>
> Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>

I think it would be nice to have some version history here as well,
for next time. I noticed that v6 was reviewed and ready to go, but
then something changed in v7 as those tags were dropped.

Kind regards
Uffe

> ---
>  .../devicetree/bindings/mmc/mmc-card.yaml          | 23 +++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.yaml b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> index a61d6c96df759102f9c1fbfd548b026a77921cae..0422894508478c8d0ca68292b58a5fdbee218358 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
> @@ -38,7 +38,9 @@ patternProperties:
>      properties:
>        compatible:
>          contains:
> -          const: fixed-partitions
> +          enum:
> +            - fixed-partitions
> +            - fixed-layout
>
>  required:
>    - compatible
> @@ -86,6 +88,25 @@ examples:
>                      read-only;
>                  };
>              };
> +
> +            partitions-boot2 {
> +                compatible = "fixed-layout";
> +
> +                #address-cells = <1>;
> +                #size-cells = <1>;
> +
> +                mac-addr@4400 {
> +                    compatible = "mac-base";
> +                    reg = <0x4400 0x6>;
> +                    #nvmem-cell-cells = <1>;
> +                };
> +
> +                bd-addr@5400 {
> +                    compatible = "mac-base";
> +                    reg = <0x5400 0x6>;
> +                    #nvmem-cell-cells = <1>;
> +                };
> +            };
>          };
>      };
>
>
> --
> 2.34.1
>