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diff --git a/Documentation/devicetree/bindings/hwmon/microchip,mcp3021.yaml b/Documentation/devicetree/bindings/hwmon/microchip,mcp3021.yaml
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+++ b/Documentation/devicetree/bindings/hwmon/microchip,mcp3021.yaml
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+# 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 <krzk@kernel.org>
+
+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 */
+        };
+    };