diff --git a/Documentation/devicetree/bindings/regulator/mediatek,mt6331-regulator.yaml b/Documentation/devicetree/bindings/regulator/mediatek,mt6331-regulator.yaml
index 6006a973b865..c654acf13768 100644
--- a/Documentation/devicetree/bindings/regulator/mediatek,mt6331-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/mediatek,mt6331-regulator.yaml
@@ -15,6 +15,10 @@ description: |
   buck-<name> and ldo-<name>.
   MT6331 regulators node should be sub node of the MT6397 MFD node.
 
+properties:
+  compatible:
+    const: mediatek,mt6331-regulator
+
 patternProperties:
   "^buck-v(core2|io18|dvfs11|dvfs12|dvfs13|dvfs14)$":
     type: object
@@ -82,6 +86,9 @@ patternProperties:
 
     unevaluatedProperties: false
 
+required:
+  - compatible
+
 additionalProperties: false
 
 examples: