diff --git a/qcom/sun.dtsi b/qcom/sun.dtsi
index c241a8bb..504c9525 100644
--- a/qcom/sun.dtsi
+++ b/qcom/sun.dtsi
@@ -974,8 +974,10 @@
 	/* secdata region can be reused by apps */
 
 	smem_mem: smem_region@81d00000 {
-		no-map;
+		compatible = "qcom,smem";
 		reg = <0x0 0x81d00000 0x0 0x200000>;
+		hwlocks = <&tcsr_mutex 3>;
+		no-map;
 	};
 
 	adsp_mhi_mem: adsp_mhi_region@81f00000 {