dt-bindings: power: supply: max8903: 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/max8903-charger.txt

-Maxim Semiconductor MAX8903 Battery Charger bindings
-
-Required properties:
-- compatible: "maxim,max8903" for MAX8903 Battery Charger
-- dok-gpios: Valid DC power has been detected (active low, input), optional if uok-gpios is provided
-- uok-gpios: Valid USB power has been detected (active low, input), optional if dok-gpios is provided
-
-Optional properties:
-- cen-gpios: Charge enable pin (active low, output)
-- chg-gpios: Charger status pin (active low, input)
-- flt-gpios: Fault pin (active low, output)
-- dcm-gpios: Current limit mode setting (DC=1 or USB=0, output)
-- usus-gpios: USB suspend pin (active high, output)
-
-
-Example:
-
-	max8903-charger {
-		compatible = "maxim,max8903";
-		dok-gpios = <&gpio2 3 GPIO_ACTIVE_LOW>;
-		flt-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
-		chg-gpios = <&gpio3 15 GPIO_ACTIVE_LOW>;
-		cen-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
-	};

Documentation/devicetree/bindings/power/supply/maxim,max8903.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/supply/maxim,max8903.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Maxim Semiconductor MAX8903 Battery Charger
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: maxim,max8903
+
+  dok-gpios:
+    maxItems: 1
+    description: Valid DC power has been detected (active low, input)
+
+  uok-gpios:
+    maxItems: 1
+    description: Valid USB power has been detected (active low, input)
+
+  cen-gpios:
+    maxItems: 1
+    description: Charge enable pin (active low, output)
+
+  chg-gpios:
+    maxItems: 1
+    description: Charger status pin (active low, input)
+
+  flt-gpios:
+    maxItems: 1
+    description: Fault pin (active low, output)
+
+  dcm-gpios:
+    maxItems: 1
+    description: Current limit mode setting (DC=1 or USB=0, output)
+
+  usus-gpios:
+    maxItems: 1
+    description: USB suspend pin (active high, output)
+
+required:
+  - compatible
+
+anyOf:
+  - required:
+      - dok-gpios
+  - required:
+      - uok-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    charger {
+      compatible = "maxim,max8903";
+      dok-gpios = <&gpio2 3 GPIO_ACTIVE_LOW>;
+      flt-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
+      chg-gpios = <&gpio3 15 GPIO_ACTIVE_LOW>;
+      cen-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
+    };