dt-bindings: rtc: armada-380-rtc: convert to dtschema

Convert existing binding to dtschema to support validation.

This is a direct conversion with no additions.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240326-rtc-yaml-v3-1-caa430ecace7@gmail.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/armada-380-rtc.txt

-* Real Time Clock of the Armada 38x/7K/8K SoCs
-
-RTC controller for the Armada 38x, 7K and 8K SoCs
-
-Required properties:
-- compatible : Should be one of the following:
-	"marvell,armada-380-rtc" for Armada 38x SoC
-	"marvell,armada-8k-rtc" for Aramda 7K/8K SoCs
-- reg: a list of base address and size pairs, one for each entry in
-  reg-names
-- reg names: should contain:
-  * "rtc" for the RTC registers
-  * "rtc-soc" for the SoC related registers and among them the one
-    related to the interrupt.
-- interrupts: IRQ line for the RTC.
-
-Example:
-
-rtc@a3800 {
-	compatible = "marvell,armada-380-rtc";
-	reg = <0xa3800 0x20>, <0x184a0 0x0c>;
-	reg-names = "rtc", "rtc-soc";
-	interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
-};

Documentation/devicetree/bindings/rtc/marvell,armada-380-rtc.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/marvell,armada-380-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RTC controller for the Armada 38x, 7K and 8K SoCs
+
+maintainers:
+  - Javier Carrasco <javier.carrasco.cruz@gmail.com>
+
+allOf:
+  - $ref: rtc.yaml#
+
+properties:
+  compatible:
+    enum:
+      - marvell,armada-380-rtc
+      - marvell,armada-8k-rtc
+
+  reg:
+    items:
+      - description: RTC base address size
+      - description: Base address and size of SoC related registers
+
+  reg-names:
+    items:
+      - const: rtc
+      - const: rtc-soc
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    rtc@a3800 {
+        compatible = "marvell,armada-380-rtc";
+        reg = <0xa3800 0x20>, <0x184a0 0x0c>;
+        reg-names = "rtc", "rtc-soc";
+        interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
+    };