dt-bindings: power: supply: sc27xx-fg: 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/sc27xx-fg.txt

-Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings
-
-Required properties:
-- compatible: Should be one of the following:
-  "sprd,sc2720-fgu",
-  "sprd,sc2721-fgu",
-  "sprd,sc2723-fgu",
-  "sprd,sc2730-fgu",
-  "sprd,sc2731-fgu".
-- reg: The address offset of fuel gauge unit.
-- battery-detect-gpios: GPIO for battery detection.
-- io-channels: Specify the IIO ADC channels to get temperature and charge voltage.
-- io-channel-names: Should be "bat-temp" or "charge-vol".
-- nvmem-cells: A phandle to the calibration cells provided by eFuse device.
-- nvmem-cell-names: Should be "fgu_calib".
-- sprd,calib-resistance-micro-ohms: Specify the real resistance of coulomb counter
-  chip in micro Ohms.
-- monitored-battery: Phandle of battery characteristics devicetree node.
-  See Documentation/devicetree/bindings/power/supply/battery.txt
-
-Example:
-
-	bat: battery {
-		compatible = "simple-battery";
-		charge-full-design-microamp-hours = <1900000>;
-		constant-charge-voltage-max-microvolt = <4350000>;
-		ocv-capacity-celsius = <20>;
-		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>,
-					<4022000 85>, <3983000 80>, <3949000 75>,
-					<3917000 70>, <3889000 65>, <3864000 60>,
-					<3835000 55>, <3805000 50>, <3787000 45>,
-					<3777000 40>, <3773000 35>, <3770000 30>,
-					<3765000 25>, <3752000 20>, <3724000 15>,
-					<3680000 10>, <3605000 5>, <3400000 0>;
-		......
-	};
-
-	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>;
-
-		fgu@a00 {
-			compatible = "sprd,sc2731-fgu";
-			reg = <0xa00>;
-			battery-detect-gpios = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
-			io-channels = <&pmic_adc 5>, <&pmic_adc 14>;
-			io-channel-names = "bat-temp", "charge-vol";
-			nvmem-cells = <&fgu_calib>;
-			nvmem-cell-names = "fgu_calib";
-			monitored-battery = <&bat>;
-			sprd,calib-resistance-micro-ohms = <21500>;
-		};
-	};

Documentation/devicetree/bindings/power/supply/sc27xx-fg.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/supply/sc27xx-fg.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    enum:
+      - sprd,sc2720-fgu
+      - sprd,sc2721-fgu
+      - sprd,sc2723-fgu
+      - sprd,sc2730-fgu
+      - sprd,sc2731-fgu
+
+  reg:
+    maxItems: 1
+
+  battery-detect-gpios:
+    maxItems: 1
+
+  io-channels:
+    items:
+      - description: Battery Temperature ADC
+      - description: Battery Charge Voltage ADC
+
+  io-channel-names:
+    items:
+      - const: bat-temp
+      - const: charge-vol
+
+  nvmem-cells:
+    maxItems: 1
+    description: Calibration cells provided by eFuse device
+
+  nvmem-cell-names:
+    const: fgu_calib
+
+  sprd,calib-resistance-micro-ohms:
+    description: real resistance of coulomb counter chip in micro Ohms
+
+  monitored-battery: true
+
+required:
+  - compatible
+  - reg
+  - battery-detect-gpios
+  - io-channels
+  - io-channel-names
+  - nvmem-cells
+  - nvmem-cell-names
+  - sprd,calib-resistance-micro-ohms
+  - monitored-battery
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    bat: battery {
+      compatible = "simple-battery";
+      charge-full-design-microamp-hours = <1900000>;
+      constant-charge-voltage-max-microvolt = <4350000>;
+      ocv-capacity-celsius = <20>;
+      ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>,
+                             <4022000 85>, <3983000 80>, <3949000 75>,
+                             <3917000 70>, <3889000 65>, <3864000 60>,
+                             <3835000 55>, <3805000 50>, <3787000 45>,
+                             <3777000 40>, <3773000 35>, <3770000 30>,
+                             <3765000 25>, <3752000 20>, <3724000 15>,
+                             <3680000 10>, <3605000 5>, <3400000 0>;
+                             // ...
+    };
+
+    pmic {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      battery@a00 {
+        compatible = "sprd,sc2731-fgu";
+        reg = <0xa00>;
+        battery-detect-gpios = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
+        io-channels = <&pmic_adc 5>, <&pmic_adc 14>;
+        io-channel-names = "bat-temp", "charge-vol";
+        nvmem-cells = <&fgu_calib>;
+        nvmem-cell-names = "fgu_calib";
+        monitored-battery = <&bat>;
+        sprd,calib-resistance-micro-ohms = <21500>;
+      };
+    };