[PATCH v6 2/9] dt-bindings: mmc: Document support for nvmem-layout
From: Loic Poulain <loic.poulain@oss.qualcomm.com>
Date: 2026-06-29 08:55:32
Also in:
linux-arm-msm, linux-block, linux-bluetooth, linux-devicetree, linux-mmc, linux-wireless, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Ulf Hansson, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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@kernel.org> Reviewed-by: Bartosz Golaszewski <redacted> Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com> --- .../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