diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
index ab81722293d3..93062403276b 100644
--- a/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
+++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.yaml
@@ -65,6 +65,9 @@ properties:
       - const: rx
       - const: tx
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg