linux-kernel - [PATCH V3 2/3] dt-bindings: nvmem: brcm,nvram: add basic NVMEM cells

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Message-Id: <20220218070729.3256-3-zajec5@gmail.com>
Date:   Fri, 18 Feb 2022 08:07:28 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V3 2/3] dt-bindings: nvmem: brcm,nvram: add basic NVMEM cells

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

NVRAM doesn't have cells at hardcoded addresses. They are stored in
internal struct (custom & dynamic format). It's still important to
define relevant cells in DT so NVMEM consumers can reference them.

Update binding to allow including basic cells as NVMEM device subnodes.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
V2: Add children nodes description per Rob's request
V3: Document NVMEM cells as properties
---
 .../devicetree/bindings/nvmem/brcm,nvram.yaml | 25 +++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
index 8c3f0cd22821..25033de3ef6b 100644
--- a/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
+++ b/Documentation/devicetree/bindings/nvmem/brcm,nvram.yaml
@@ -14,6 +14,8 @@ description: |
   NVRAM can be accessed on Broadcom BCM47xx MIPS and Northstar ARM Cortex-A9
   devices usiong I/O mapped memory.
 
+  NVRAM variables can be defined as NVMEM device subnodes.
+
 maintainers:
   - Rafał Miłecki <rafal@...ecki.pl>
 
@@ -27,11 +29,30 @@ properties:
   reg:
     maxItems: 1
 
+  board_id:
+    type: object
+    description: Board identification name
+
+  et0macaddr:
+    type: object
+    description: First Ethernet interface's MAC address
+
+  et1macaddr:
+    type: object
+    description: Second Ethernet interface's MAC address
+
+  et2macaddr:
+    type: object
+    description: Third Ethernet interface's MAC address
+
 unevaluatedProperties: false
 
 examples:
   - |
     nvram@...f0000 {
-            compatible = "brcm,nvram";
-            reg = <0x1eff0000 0x10000>;
+        compatible = "brcm,nvram";
+        reg = <0x1eff0000 0x10000>;
+
+        mac: et0macaddr {
+        };
     };
-- 
2.34.1