diff --git a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
index 7822705ad16c6baa77d323f3bc2aa5595a3610a4..44cb3cf22bfb3e7146b10d5dc720c89363081ac5 100644
--- a/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml
@@ -19,6 +19,9 @@ description: |
   is active since power-on and does not need any clock gating and is usable
   as very early serial console.
 
+allOf:
+  - $ref: serial.yaml#
+
 properties:
   compatible:
     oneOf:
@@ -69,7 +72,7 @@ required:
   - clocks
   - clock-names
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |