diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
index c579ac074ca7dc7db5516b74aefb0d7738e17826..d383b2ab3ce86df09cb0c26217d4bceead6a15e3 100644
--- a/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
+++ b/Documentation/devicetree/bindings/mailbox/mediatek,gce-mailbox.yaml
@@ -21,6 +21,7 @@ properties:
       - mediatek,mt8173-gce
       - mediatek,mt8183-gce
       - mediatek,mt8186-gce
+      - mediatek,mt8188-gce
       - mediatek,mt8192-gce
       - mediatek,mt8195-gce