dt-bindings: nvmem: Add fsl,scu-ocotp yaml file

In order to replace the fsl,scu txt file from bindings/arm/freescale,
we need to split it between the right subsystems. This patch documents
separately the 'ocotp' child node of the SCU main node.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt

@@ -87,20 +87,6 @@ RTC bindings based on SCU Message Protocol
 Required properties:
 - compatible: should be "fsl,imx8qxp-sc-rtc";
 
-OCOTP bindings based on SCU Message Protocol
-------------------------------------------------------------
-Required properties:
-- compatible:		Should be one of:
-			"fsl,imx8qm-scu-ocotp",
-			"fsl,imx8qxp-scu-ocotp".
-- #address-cells:	Must be 1. Contains byte index
-- #size-cells:		Must be 1. Contains byte length
-
-Optional Child nodes:
-
-- Data cells of ocotp:
-  Detailed bindings are described in bindings/nvmem/nvmem.txt
-
 Watchdog bindings based on SCU Message Protocol
 ------------------------------------------------------------
 
@@ -149,16 +135,6 @@ firmware {
 			  &lsio_mu1 1 3
 			  &lsio_mu1 3 3>;
 
-		ocotp: imx8qx-ocotp {
-			compatible = "fsl,imx8qxp-scu-ocotp";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			fec_mac0: mac@2c4 {
-				reg = <0x2c4 8>;
-			};
-		};
-
 		pd: imx8qx-pd {
 			compatible = "fsl,imx8qxp-scu-pd", "fsl,scu-pd";
 			#power-domain-cells = <1>;

Documentation/devicetree/bindings/nvmem/fsl,scu-ocotp.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/fsl,scu-ocotp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX SCU Client Device Node - OCOTP bindings based on SCU Message Protocol
+
+maintainers:
+  - Dong Aisheng <aisheng.dong@nxp.com>
+
+description: i.MX SCU Client Device Node
+  Client nodes are maintained as children of the relevant IMX-SCU device node.
+
+allOf:
+  - $ref: nvmem.yaml#
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qm-scu-ocotp
+      - fsl,imx8qxp-scu-ocotp
+
+patternProperties:
+  '^mac@[0-9a-f]*$':
+    type: object
+    description:
+      MAC address.
+
+    properties:
+      reg:
+        description:
+          Byte offset within OCOTP where the MAC address is stored
+        maxItems: 1
+
+    required:
+      - reg
+
+    additionalProperties: false
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    ocotp {
+        compatible = "fsl,imx8qxp-scu-ocotp";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        fec_mac0: mac@2c4 {
+            reg = <0x2c4 6>;
+        };
+    };