diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt4801-regulator.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt4801-regulator.yaml
index fa075c6e67f9..235e593b3b2c 100644
--- a/Documentation/devicetree/bindings/regulator/richtek,rt4801-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/richtek,rt4801-regulator.yaml
@@ -49,6 +49,8 @@ required:
   - compatible
   - reg
 
+additionalProperties: false
+
 examples:
   - |
     i2c {