[PATCH 1/9] dt-bindings: mmc: Document support for nvmem-layout

Loic Poulain
2026-04-28T14:23:15Z

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 <loic.poulain@oss.qualcomm.com>
---
Documentation/devicetree/bindings/mmc/mmc-card.yaml | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.yaml b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
index a61d6c96df759102f9c1fbfd548b026a77921cae..e01fc82ab8520a31196475b18acb5e839e1bf71f 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 +89,23 @@ examples:
read-only;
};
};
+
+ partitions-boot2 {
+ nvmem-layout {
+ compatible = "fixed-layout";
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ mac-addr@4400 {
+ reg = <0x4400 0x6>;
+ };
+
+ bd-addr@5400 {
+ reg = <0x5400 0x6>;
+ };
+ };
+ };
};
};

--
2.34.1