[PATCH V3 5/6] dt-bindings: nvmem: u-boot, env: add MAC's #nvmem-cell-cells

[Rafał Miłecki]

From: Rafał Miłecki <rafal at milecki.pl>

U-Boot's "ethaddr" environment variable is very often used to store
*base* MAC address. It's used as a base for calculating addresses for
multiple interfaces. It's done by adding proper values. Actual offsets
are picked by manufacturers and vary across devices.

Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
Reviewed-by: Rob Herring <robh at kernel.org>
---
 .../devicetree/bindings/nvmem/layouts/u-boot,env.yaml      | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
index fb273b174fe7..dbff702f2e5d 100644
--- a/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
+++ b/Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
@@ -45,7 +45,11 @@ properties:
 
   ethaddr:
     type: object
-    description: Ethernet interface's MAC address
+    description: Ethernet interfaces base MAC address.
+    properties:
+      "#nvmem-cell-cells":
+        description: The first argument is a MAC address offset.
+        const: 1
 
 additionalProperties: false
 
@@ -69,6 +73,7 @@ examples:
                 compatible = "u-boot,env";
 
                 mac: ethaddr {
+                    #nvmem-cell-cells = <1>;
                 };
             };
         };
-- 
2.34.1