diff --git a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
index eeffaf9bf471..bb37651a0014 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
@@ -201,3 +201,7 @@ &c66_1 {
 	memory-region = <&c66_1_dma_memory_region>,
 			<&c66_1_memory_region>;
 };
+
+&c71_0 {
+	mboxes = <&mailbox0_cluster4 &mbox_c71_0>;
+};