diff --git a/qcom/sun.dtsi b/qcom/sun.dtsi
index 99200f28..5b1c3df4 100644
--- a/qcom/sun.dtsi
+++ b/qcom/sun.dtsi
@@ -576,6 +576,17 @@
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		smp2p_smem_mailbox_1_out: qcom,smp2p-smem-mailbox-1-out {
+			qcom,entry-name = "smem-mailbox";
+			#qcom,smem-state-cells = <1>;
+		};
+
+		smp2p_smem_mailbox_1_in: qcom,smp2p-smem-mailbox-1-in {
+			qcom,entry-name = "smem-mailbox";
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
 	};
 
 	qcom,smp2p-soccp {