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@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20260530205333.117458-11-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/airoha,smc-efuses.yaml

@@ -0,0 +1,67 @@
+# 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 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@gmail.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
+  - '#address-cells'
+  - '#size-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    efuse {
+        compatible = "airoha,an7581-efuses";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        efuse-bank@0 {
+           reg = <0>;
+        };
+    };
+
+...