linux-kernel - [PATCH 3/4] dt-bindings: nvmem: u-boot,env: add MAC's #nvmem-cell-cells

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Date:   Wed, 22 Feb 2023 18:22:44 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <michael@...le.cc>, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, u-boot@...ts.denx.de,
        Rafał Miłecki <rafal@...ecki.pl>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 3/4] dt-bindings: nvmem: u-boot,env: add MAC's #nvmem-cell-cells

From: Rafał Miłecki <rafal@...ecki.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@...ecki.pl>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 Documentation/devicetree/bindings/nvmem/u-boot,env.yaml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
index cbc5c69fd405..36d97fb87865 100644
--- a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+++ b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
@@ -50,7 +50,11 @@ 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
 
@@ -72,6 +76,7 @@ examples:
             reg = <0x40000 0x10000>;
 
             mac: ethaddr {
+                #nvmem-cell-cells = <1>;
             };
         };
     };
-- 
2.34.1