linux-kernel - [PATCH 1/3] dt-bindings: nvmem: brcm,nvram: add #nvmem-cell-cells for MACs

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Message-Id: <20230406110804.12024-1-zajec5@gmail.com>
Date:   Thu,  6 Apr 2023 13:08:02 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH 1/3] dt-bindings: nvmem: brcm,nvram: add #nvmem-cell-cells for MACs

From: Rafał Miłecki <rafal@...ecki.pl>

Broadcom's NVRAM contains MACs for Ethernet interfaces. Those MACs are
usually base addresses that are also used for calculating other MACs.

For example if a router vendor decided to use gmac0 it most likely
programmed NVRAM of each unit with a proper "et0macaddr" value. That is
a base.

Ethernet interface is usually connected to switch port. Switch usually
includes few LAN ports and a WAN port. MAC of WAN port gets calculated
as relative address to the interface one. Offset varies depending on
device model.

Wireless MACs may also need to be calculated using relevant offsets.

To support all those scenarios let MAC NVMEM cells be referenced with an
index specifying MAC offset.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../devicetree/bindings/nvmem/brcm,nvram.yaml        | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
index 36def7128fca..a921e05cc544 100644
--- a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
+++ b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
@@ -36,14 +36,26 @@ properties:
   et0macaddr:
     type: object
     description: First Ethernet interface's MAC address
+    properties:
+      "#nvmem-cell-cells":
+        description: The first argument is a MAC address offset.
+        const: 1
 
   et1macaddr:
     type: object
     description: Second Ethernet interface's MAC address
+    properties:
+      "#nvmem-cell-cells":
+        description: The first argument is a MAC address offset.
+        const: 1
 
   et2macaddr:
     type: object
     description: Third Ethernet interface's MAC address
+    properties:
+      "#nvmem-cell-cells":
+        description: The first argument is a MAC address offset.
+        const: 1
 
 unevaluatedProperties: false
 
-- 
2.34.1