dt-bindings: power: supply: twl4030: 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/twl-charger.txt

-TWL BCI (Battery Charger Interface)
-
-The battery charger needs to interact with the USB phy in order
-to know when charging is permissible, and when there is a connection
-or disconnection.
-
-The choice of phy cannot be configured at a hardware level, so there
-is no value in explicit configuration in device-tree.  Rather
-if there is a sibling of the BCI node which is compatible with
-"ti,twl4030-usb", then that is used to determine when and how
-use USB power for charging.
-
-Required properties:
-- compatible:
-  - "ti,twl4030-bci"
-- interrupts: two interrupt lines from the TWL SIH (secondary
-  interrupt handler) - interrupts 9 and 2.
-
-Optional properties:
-- ti,bb-uvolt: microvolts for charging the backup battery.
-- ti,bb-uamp: microamps for charging the backup battery.
-
-Examples:
-
-bci {
-   compatible = "ti,twl4030-bci";
-   interrupts = <9>, <2>;
-   ti,bb-uvolt = <3200000>;
-   ti,bb-uamp = <150>;
-};

Documentation/devicetree/bindings/power/supply/twl4030-charger.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/power/supply/twl4030-charger.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: TWL4030 BCI (Battery Charger Interface)
+
+description: |
+  The battery charger needs to interact with the USB phy in order to know when
+  charging is permissible, and when there is a connection or disconnection.
+
+  The choice of phy cannot be configured at a hardware level, so there is no
+  value in explicit configuration in device-tree. Rather if there is a sibling
+  of the BCI node which is compatible with "ti,twl4030-usb", then that is used
+  to determine when and how use USB power for charging.
+
+maintainers:
+  - Sebastian Reichel <sre@kernel.org>
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    const: ti,twl4030-bci
+
+  interrupts:
+    minItems: 2
+    maxItems: 2
+
+  ti,bb-uvolt:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: microvolts for charging the backup battery
+
+  ti,bb-uamp:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: microamps for charging the backup battery
+
+  io-channels:
+    items:
+      - description: Accessory Charger Voltage Channel
+
+  io-channel-names:
+    items:
+      - const: vac
+
+  bci3v1-supply:
+    description: 3.1V USB regulator
+
+required:
+  - compatible
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    pmic {
+      charger {
+        compatible = "ti,twl4030-bci";
+        interrupts = <9>, <2>;
+        ti,bb-uvolt = <3200000>;
+        ti,bb-uamp = <150>;
+        io-channels = <&twl_madc 11>;
+        io-channel-names = "vac";
+      };
+    };