dt-bindings: nvmem: add rockchip-secure-otp bindings

Change-Id: Ia8b0ca44256d602b771346dd8c46f67ef3f6864f
Signed-off-by: Hisping Lin <hisping.lin@rock-chips.com>

Documentation/devicetree/bindings/nvmem/rockchip-secure-otp.yaml

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/rockchip-secure-otp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Rockchip secure otp device tree bindings
+
+maintainers:
+  - Hisping <hisping.lin@rock-chips.com>
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - rockchip,secure-otp
+
+  rockchip,otp-size:
+    description:
+      size of non-protected oem zone in secure otp, In bytes.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - rockchip,otp-size
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    secure_otp: secure-otp {
+            compatible = "rockchip,secure-otp";
+            rockchip,otp-size = <32>;
+    };
+...