dt-bindings: rtc: Convert MXC RTC V2 to json-schema

Convert the MXC RTC V2 binding to DT schema format using json-schema.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/rtc/rtc-mxc_v2.txt

-* i.MX53 Secure Real Time Clock (SRTC)
-
-Required properties:
-- compatible: should be: "fsl,imx53-rtc"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- clocks: should contain the phandle for the rtc clock
-- interrupts: rtc alarm interrupt
-
-Example:
-
-rtc@53fa4000 {
-	compatible = "fsl,imx53-rtc";
-	reg = <0x53fa4000 0x4000>;
-	interrupts = <24>;
-	clocks = <&clks IMX5_CLK_SRTC_GATE>;
-};

Documentation/devicetree/bindings/rtc/rtc-mxc_v2.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/rtc-mxc_v2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX53 Secure Real Time Clock (SRTC)
+
+allOf:
+  - $ref: "rtc.yaml#"
+
+maintainers:
+  - Patrick Bruenn <p.bruenn@beckhoff.com>
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx53-rtc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx5-clock.h>
+
+    rtc@53fa4000 {
+        compatible = "fsl,imx53-rtc";
+        reg = <0x53fa4000 0x4000>;
+        interrupts = <24>;
+        clocks = <&clks IMX5_CLK_SRTC_GATE>;
+    };