[PATCH v4 1/8] dt-bindings: mmc: Document support for nvmem-layout
From: Loic Poulain
Date: Tue Jun 09 2026 - 03:58:19 EST
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.
Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxxxxxxxx>
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/mmc/mmc-card.yaml | 29 ++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.yaml b/Documentation/devicetree/bindings/mmc/mmc-card.yaml
index a61d6c96df759102f9c1fbfd548b026a77921cae..ca907ad73095925b234b119948f94ae81e698c86 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 +89,32 @@ examples:
read-only;
};
};
+
+ partitions-boot2 {
+ compatible = "fixed-partitions";
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ nvmem-layout {
+ 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