diff --git a/qcom/tuna-reserved-memory.dtsi b/qcom/tuna-reserved-memory.dtsi
index 8c9df41b..b990fbcb 100644
--- a/qcom/tuna-reserved-memory.dtsi
+++ b/qcom/tuna-reserved-memory.dtsi
@@ -66,8 +66,10 @@
 	};
 
 	smem_mem: smem_region@81d00000 {
-		no-map;
+		compatible = "qcom,smem";
 		reg = <0x0 0x81d00000 0x0 0x200000>;
+		hwlocks = <&tcsr_mutex 3>;
+		no-map;
 	};
 
 	pdp_ns_shared_mem: pdp_ns_shared_region@81f00000 {
diff --git a/qcom/tuna.dtsi b/qcom/tuna.dtsi
index 59675080..eaaff929 100644
--- a/qcom/tuna.dtsi
+++ b/qcom/tuna.dtsi
@@ -473,6 +473,17 @@
 		wakeup-parent = <&pdc>;
 	};
 
+	tcsr_mutex_block: syscon@1f40000 {
+		compatible = "syscon";
+		reg = <0x1f40000 0x20000>;
+	};
+
+	tcsr_mutex: hwlock {
+		compatible = "qcom,tcsr-mutex";
+		syscon = <&tcsr_mutex_block 0 0x1000>;
+		#hwlock-cells = <1>;
+	};
+
 	ipcc_mproc: qcom,ipcc@406000 {
 		compatible = "qcom,ipcc";
 		reg = <0x406000 0x1000>;