linux-kernel - [PATCH 4/4] dt-bindings: nvmem: brcm,nvram: add basic NVMEM cells

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Date:   Fri, 25 Feb 2022 17:58:22 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Rob Herring <robh@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 4/4] 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>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 .../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 {
+        };
     };
-- 
2.21.0