diff --git a/Documentation/devicetree/bindings/serial/litex,liteuart.yaml b/Documentation/devicetree/bindings/serial/litex,liteuart.yaml
index bc79b3cca542..c4f1f489dc2d 100644
--- a/Documentation/devicetree/bindings/serial/litex,liteuart.yaml
+++ b/Documentation/devicetree/bindings/serial/litex,liteuart.yaml
@@ -29,6 +29,8 @@ required:
   - compatible
   - reg
 
+additionalProperties: false
+
 examples:
   - |
     uart0: serial@e0001800 {