dt-bindings: power: supply: n900-battery: Convert to DT schema format

Convert the binding to DT schema format.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Rejected-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/power/supply/nokia,n900-battery.yaml

@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/supply/nokia,n900-battery.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Nokia N900 battery
+
+maintainers:
+  - Pali Rohár <pali@kernel.org>
+  - Sebastian Reichel <sre@kernel.org>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: nokia,n900-battery
+
+  io-channels:
+    items:
+      - description: ADC channel for temperature reading
+      - description: ADC channel for battery size identification
+      - description: ADC channel to measure the battery voltage
+
+  io-channel-names:
+    items:
+      - const: temp
+      - const: bsi
+      - const: vbat
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+
+additionalProperties: false
+
+examples:
+  - |
+    battery {
+      compatible = "nokia,n900-battery";
+      io-channels = <&twl4030_madc 0>,
+                    <&twl4030_madc 4>,
+                    <&twl4030_madc 12>;
+      io-channel-names = "temp",
+                         "bsi",
+                         "vbat";
+    };

Documentation/devicetree/bindings/power/supply/rx51-battery.txt

@@ -1,25 +0,0 @@
-Binding for Nokia N900 battery
-
-The Nokia N900 battery status can be read via the TWL4030's A/D converter.
-
-Required properties:
-- compatible: Should contain one of the following:
- * "nokia,n900-battery"
-- io-channels: Should contain IIO channel specifiers
-               for each element in io-channel-names.
-- io-channel-names: Should contain the following values:
- * "temp" - The ADC channel for temperature reading
- * "bsi"  - The ADC channel for battery size identification
- * "vbat" - The ADC channel to measure the battery voltage
-
-Example from Nokia N900:
-
-battery: n900-battery {
-	compatible = "nokia,n900-battery";
-	io-channels = <&twl4030_madc 0>,
-		      <&twl4030_madc 4>,
-		      <&twl4030_madc 12>;
-	io-channel-names = "temp",
-			   "bsi",
-			   "vbat";
-};