regulator: Convert SY8106A binding to a schema

The Silergy SY8106A is a regulator controlled through i2c supported by
Linux with a matching device tree binding.

Now that we have the DT validation in place, let's convert the device
tree bindings for that driver over to a YAML schema.

Cc: Icenowy Zheng <icenowy@aosc.io>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Ondrej Jirman <megous@megous.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210901091852.479202-34-maxime@cerno.techSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/silergy,sy8106a.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/silergy,sy8106a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Silergy SY8106A Voltage Regulator Device Tree Bindings
+
+maintainers:
+  - Ondrej Jirman <megous@megous.com>
+
+allOf:
+  - $ref: regulator.yaml#
+
+properties:
+  compatible:
+    const: silergy,sy8106a
+
+  reg:
+    maxItems: 1
+
+  silergy,fixed-microvolt:
+    description: >
+      The voltage when I2C regulating is disabled (set by external resistor
+      like a fixed voltage)
+
+required:
+  - compatible
+  - reg
+  - silergy,fixed-microvolt
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        regulator@65 {
+            compatible = "silergy,sy8106a";
+            reg = <0x65>;
+            regulator-name = "sy8106a-vdd";
+            silergy,fixed-microvolt = <1200000>;
+            regulator-min-microvolt = <1000000>;
+            regulator-max-microvolt = <1400000>;
+            regulator-boot-on;
+            regulator-always-on;
+        };
+    };
+
+...

Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt

-SY8106A Voltage regulator
-
-Required properties:
-- compatible: Must be "silergy,sy8106a"
-- reg: I2C slave address - must be <0x65>
-- silergy,fixed-microvolt - the voltage when I2C regulating is disabled (set
-  by external resistor like a fixed voltage)
-
-Any property defined as part of the core regulator binding, defined in
-./regulator.txt, can also be used.
-
-Example:
-
-	sy8106a {
-		compatible = "silergy,sy8106a";
-		reg = <0x65>;
-		regulator-name = "sy8106a-vdd";
-		silergy,fixed-microvolt = <1200000>;
-		regulator-min-microvolt = <1000000>;
-		regulator-max-microvolt = <1400000>;
-		regulator-boot-on;
-		regulator-always-on;
-	};