diff --git a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
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@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/qnap,ts433-mcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: QNAP NAS on-board Microcontroller
+
+maintainers:
+  - Heiko Stuebner <heiko@sntech.de>
+
+description:
+  QNAP embeds a microcontroller on their NAS devices adding system feature
+  as PWM Fan control, additional LEDs, power button status and more.
+
+properties:
+  compatible:
+    enum:
+      - qnap,ts433-mcu
+
+patternProperties:
+  "^fan-[0-9]+$":
+    $ref: /schemas/hwmon/fan-common.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    uart {
+      mcu {
+        compatible = "qnap,ts433-mcu";
+
+        fan-0 {
+          #cooling-cells = <2>;
+          cooling-levels = <0 64 89 128 166 204 221 238>;
+        };
+      };
+    };