linux-kernel - [PATCH v2 1/2] dt-bindings: nvmem: airoha: add SMC eFuses schema

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Message-ID: <20250721184640.2885-1-ansuelsmth@gmail.com>
Date: Mon, 21 Jul 2025 20:46:33 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Christian Marangi <ansuelsmth@...il.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: nvmem: airoha: add SMC eFuses schema

Add Airoha SMC eFuses schema to document new Airoha SoC AN7581/AN7583
way of accessing the 2 eFuse bank via the SMC command.

Each eFuse bank expose 64 eFuse cells of 32 bit used to give information
on HW Revision, PHY Calibration,  Device Model, Private Key and
all kind of other info specific to the SoC or the running system.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
Changes v2:
- Drop redundant description for reg
- Improve example node name

 .../bindings/nvmem/airoha,smc-efuses.yaml     | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/airoha,smc-efuses.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/airoha,smc-efuses.yaml b/Documentation/devicetree/bindings/nvmem/airoha,smc-efuses.yaml
new file mode 100644
index 000000000000..e21ce07c4f41
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/airoha,smc-efuses.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/airoha,smc-efuses.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Airoha SMC eFuses
+
+description: |
+  Airoha new SoC (AN7581/AN7583) expose banks of eFuse accessible
+  via specific SMC commands.
+
+  2 different bank of eFuse or 64 cells of 32 bit are exposed
+  read-only used to give information on HW Revision, PHY Calibration,
+  Device Model, Private Key...
+
+maintainers:
+  - Christian Marangi <ansuelsmth@...il.com>
+
+properties:
+  compatible:
+    enum:
+      - airoha,an7581-efuses
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  '^efuse-bank@[0-1]$':
+    type: object
+
+    allOf:
+      - $ref: nvmem.yaml#
+
+    properties:
+      reg:
+        description: Identify the eFuse bank.
+        enum: [0, 1]
+
+    required:
+      - reg
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    efuse {
+        compatible = "airoha,an7581-efuses";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        efuse-bank@0 {
+           reg = <0>;
+        };
+    };
+
+...
-- 
2.50.0