dt-bindings: rtc: convert rtc-meson.txt to dt-schema

Convert the Amlogic Meson6 RTC bindings to dt-schema.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221117-b4-amlogic-bindings-convert-v1-6-3f025599b968@linaro.orgSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/amlogic,meson6-rtc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/amlogic,meson6-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+  - Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+
+allOf:
+  - $ref: rtc.yaml#
+  - $ref: /schemas/nvmem/nvmem.yaml#
+
+properties:
+  compatible:
+    enum:
+      - amlogic,meson6-rtc
+      - amlogic,meson8-rtc
+      - amlogic,meson8b-rtc
+      - amlogic,meson8m2-rtc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    rtc: rtc@740 {
+        compatible = "amlogic,meson6-rtc";
+        reg = <0x740 0x14>;
+        interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;
+        clocks = <&rtc32k_xtal>;
+        vdd-supply = <&rtc_vdd>;
+        resets = <&reset_rtc>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        mac@0 {
+            reg = <0 6>;
+        };
+    };

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

-* Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC
-
-Required properties:
-- compatible: should be one of the following describing the hardware:
-	* "amlogic,meson6-rtc"
-	* "amlogic,meson8-rtc"
-	* "amlogic,meson8b-rtc"
-	* "amlogic,meson8m2-rtc"
-
-- reg: physical register space for the controller's memory mapped registers.
-- interrupts: the interrupt line of the RTC block.
-- clocks: reference to the external 32.768kHz crystal oscillator.
-- vdd-supply: reference to the power supply of the RTC block.
-- resets: reset controller reference to allow reset of the controller
-
-Optional properties for the battery-backed non-volatile memory:
-- #address-cells: should be 1 to address the battery-backed non-volatile memory
-- #size-cells: should be 1 to reference the battery-backed non-volatile memory
-
-Optional child nodes:
-- see ../nvmem/nvmem.txt
-
-Example:
-
-	rtc: rtc@740 {
-		compatible = "amlogic,meson6-rtc";
-		reg = <0x740 0x14>;
-		interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;
-		clocks = <&rtc32k_xtal>;
-		vdd-supply = <&rtc_vdd>;
-		resets = <&reset RESET_RTC>;
-
-		#address-cells = <1>;
-		#size-cells = <1>;
-	};