diff --git a/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml b/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
index 474c1a0f99f3..bdf58f03b848 100644
--- a/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
+++ b/Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
@@ -33,6 +33,13 @@ properties:
               - apple,t6000-asc-mailbox
           - const: apple,asc-mailbox-v4
 
+      - description:
+          An older ASC mailbox interface found on T2 and A11 that is also
+          used for the NVMe coprocessor and the system management
+          controller.
+        items:
+          - const: apple,t8015-asc-mailbox
+
       - description:
           M3 mailboxes are an older variant with a slightly different MMIO
           interface still found on the M1. It is used for the Thunderbolt