regulator: dt-bindings: Convert Fairchild FAN53555 to DT schema

Convert the Fairchild FAN53555 and compatible variants binding to DT
schema format.

Add the undocumented 'vsel-gpios' property used to control the VSEL pin.

The example was missing 'reg', so add it.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230109004656.451231-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/fan53555.txt

@@ -1,24 +0,0 @@
-Binding for Fairchild FAN53555 regulators
-
-Required properties:
-  - compatible: one of "fcs,fan53555", "fcs,fan53526", "silergy,syr827",
-		"silergy,syr828" or "tcs,tcs4525".
-  - reg: I2C address
-
-Optional properties:
-  - fcs,suspend-voltage-selector: declare which of the two available
-		voltage selector registers should be used for the suspend
-		voltage. The other one is used for the runtime voltage setting
-		Possible values are either <0> or <1>
-  - vin-supply: regulator supplying the vin pin
-
-Example:
-
-	regulator@40 {
-		compatible = "fcs,fan53555";
-		regulator-name = "fan53555";
-		regulator-min-microvolt = <1000000>;
-		regulator-max-microvolt = <1800000>;
-		vin-supply = <&parent_reg>;
-		fcs,suspend-voltage-selector = <1>;
-	};

Documentation/devicetree/bindings/regulator/fcs,fan53555.yaml

@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/fcs,fan53555.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Fairchild FAN53555 regulators
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+allOf:
+  - $ref: regulator.yaml#
+
+properties:
+  compatible:
+    enum:
+      - fcs,fan53555
+      - fcs,fan53526
+      - silergy,syr827
+      - silergy,syr828
+      - tcs,tcs4525
+
+  reg:
+    maxItems: 1
+
+  fcs,suspend-voltage-selector:
+    description: Declares which of the two available voltage selector
+      registers should be used for the suspend voltage. The other one is used
+      for the runtime voltage setting.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+
+  vin-supply:
+    description: Supply for the vin pin
+
+  vsel-gpios:
+    description: Voltage Select. When this pin is LOW, VOUT is set by the
+      VSEL0 register. When this pin is HIGH, VOUT is set by the VSEL1 register.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@40 {
+            compatible = "fcs,fan53555";
+            reg = <0x40>;
+            regulator-name = "fan53555";
+            regulator-min-microvolt = <1000000>;
+            regulator-max-microvolt = <1800000>;
+            vin-supply = <&parent_reg>;
+            fcs,suspend-voltage-selector = <1>;
+        };
+    };
+...