dt-bindings: lan9662-otpc: document Lan9662 OTPC

Document Lan9662 OTP controller.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220916122100.170016-12-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/microchip,lan9662-otpc.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/microchip,lan9662-otpc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip LAN9662 OTP Controller (OTPC)
+
+maintainers:
+  - Horatiu Vultur <horatiu.vultur@microchip.com>
+
+description: |
+  OTP controller drives a NVMEM memory where system specific data
+  (e.g. hardware configuration settings, chip identifiers) or
+  user specific data could be stored.
+
+allOf:
+  - $ref: nvmem.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - const: microchip,lan9668-otpc
+          - const: microchip,lan9662-otpc
+      - enum:
+          - microchip,lan9662-otpc
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    otpc: otp@e0021000 {
+        compatible = "microchip,lan9662-otpc";
+        reg = <0xe0021000 0x300>;
+    };
+
+...