diff --git a/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
index b526f9c0c272..bf6ab4e7050c 100644
--- a/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
+++ b/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
@@ -16,6 +16,7 @@ properties:
     enum:
       - sprd,sc9860-mailbox
       - sprd,sc9863a-mailbox
+      - sprd,ums9230-mailbox
 
   reg:
     items: