dt-bindings: power: supply: sc2731-charger: Convert to DT schema format

Convert the binding to DT schema format.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/power/supply/sc2731-charger.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/supply/sc2731-charger.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Spreadtrum SC2731 PMICs battery charger binding
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: sprd,sc2731-charger
+
+  reg:
+    maxItems: 1
+
+  phys:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to the USB phy
+
+  monitored-battery:
+    description: |
+      The charger uses the following battery properties
+      - charge-term-current-microamp: current for charge termination phase.
+      - constant-charge-voltage-max-microvolt: maximum constant input voltage.
+      See Documentation/devicetree/bindings/power/supply/battery.yaml
+
+additionalProperties: false
+
+examples:
+  - |
+    bat: battery {
+      compatible = "simple-battery";
+      charge-term-current-microamp = <120000>;
+      constant-charge-voltage-max-microvolt = <4350000>;
+    };
+
+    pmic {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      battery@a00 {
+        compatible = "sprd,sc2731-charger";
+        reg = <0x0>;
+        phys = <&ssphy>;
+        monitored-battery = <&bat>;
+      };
+    };

Documentation/devicetree/bindings/power/supply/sc2731_charger.txt

-Spreadtrum SC2731 PMIC battery charger binding
-
-Required properties:
- - compatible: Should be "sprd,sc2731-charger".
- - reg: Address offset of charger register.
- - phys: Contains a phandle to the USB phy.
-
-Optional Properties:
-- monitored-battery: phandle of battery characteristics devicetree node.
-  The charger uses the following battery properties:
-- charge-term-current-microamp: current for charge termination phase.
-- constant-charge-voltage-max-microvolt: maximum constant input voltage.
-  See Documentation/devicetree/bindings/power/supply/battery.txt
-
-Example:
-
-	bat: battery {
-		compatible = "simple-battery";
-		charge-term-current-microamp = <120000>;
-		constant-charge-voltage-max-microvolt = <4350000>;
-		......
-	};
-
-	sc2731_pmic: pmic@0 {
-		compatible = "sprd,sc2731";
-		reg = <0>;
-		spi-max-frequency = <26000000>;
-		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
-		interrupt-controller;
-		#interrupt-cells = <2>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		charger@0 {
-			compatible = "sprd,sc2731-charger";
-			reg = <0x0>;
-			phys = <&ssphy>;
-			monitored-battery = <&bat>;
-		};
-	};