dt-bindings: rtc: Convert apm,xgene-rtc to DT schema

new file mode 100644
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/apm,xgene-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: APM X-Gene Real Time Clock
+
+maintainers:
+  - Khuong Dinh <[email protected]>
+
+properties:
+  compatible:
+    const: apm,xgene-rtc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - '#clock-cells'
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    rtc@10510000 {
+        compatible = "apm,xgene-rtc";
+        reg = <0x10510000 0x400>;
+        interrupts = <0x0 0x46 0x4>;
+        #clock-cells = <1>;
+        clocks = <&rtcclk 0>;
+    };

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-* APM X-Gene Real Time Clock
-
-RTC controller for the APM X-Gene Real Time Clock
-
-Required properties:
-- compatible : Should be "apm,xgene-rtc"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- interrupts: IRQ line for the RTC.
-- #clock-cells: Should be 1.
-- clocks: Reference to the clock entry.
-
-Example:
-
-rtcclk: rtcclk {
-	compatible = "fixed-clock";
-	#clock-cells = <1>;
-	clock-frequency = <100000000>;
-	clock-output-names = "rtcclk";
-};
-
-rtc: rtc@10510000 {
-	compatible = "apm,xgene-rtc";
-	reg = <0x0 0x10510000 0x0 0x400>;
-	interrupts = <0x0 0x46 0x4>;
-	#clock-cells = <1>;
-	clocks = <&rtcclk 0>;
-};