dt-bindings: hwmon: microchip,mcp3021: convert to dtschema

Convert the Microchip MCP3021 ADC bindings to DT schema format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210921102832.143352-5-krzysztof.kozlowski@canonical.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/hwmon/mcp3021.txt

@@ -1,21 +0,0 @@
-mcp3021 properties
-
-Required properties:
-- compatible: Must be one of the following:
-	- "microchip,mcp3021" for mcp3021
-	- "microchip,mcp3221" for mcp3221
-- reg: I2C address
-
-Optional properties:
-
-- reference-voltage-microvolt
-	Reference voltage in microvolt (uV)
-
-Example:
-
-mcp3021@4d {
-	compatible = "microchip,mcp3021";
-	reg = <0x4d>;
-
-	reference-voltage-microvolt = <4500000>; /* 4.5 V */
-};

Documentation/devicetree/bindings/hwmon/microchip,mcp3021.yaml

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/microchip,mcp3021.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip MCP3021 A/D converter
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+properties:
+  compatible:
+    enum:
+      - microchip,mcp3021
+      - microchip,mcp3221
+
+  reg:
+    maxItems: 1
+
+  reference-voltage-microvolt:
+    description:
+      VDD supply power and reference voltage
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@4d {
+            compatible = "microchip,mcp3021";
+            reg = <0x4d>;
+
+            reference-voltage-microvolt = <4500000>; /* 4.5 V */
+        };
+    };