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 a75611eec791..8724ae20fb23 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
@@ -549,58 +549,58 @@
 };
 
 &mcu_r5fss0_core0 {
-	mboxes = <&mailbox0_cluster0>, <&mbox_mcu_r5fss0_core0>;
+	mboxes = <&mailbox0_cluster0 &mbox_mcu_r5fss0_core0>;
 	memory-region = <&mcu_r5fss0_core0_dma_memory_region>,
 			<&mcu_r5fss0_core0_memory_region>;
 };
 
 &mcu_r5fss0_core1 {
-	mboxes = <&mailbox0_cluster0>, <&mbox_mcu_r5fss0_core1>;
+	mboxes = <&mailbox0_cluster0 &mbox_mcu_r5fss0_core1>;
 	memory-region = <&mcu_r5fss0_core1_dma_memory_region>,
 			<&mcu_r5fss0_core1_memory_region>;
 };
 
 &main_r5fss0_core0 {
-	mboxes = <&mailbox0_cluster1>, <&mbox_main_r5fss0_core0>;
+	mboxes = <&mailbox0_cluster1 &mbox_main_r5fss0_core0>;
 	memory-region = <&main_r5fss0_core0_dma_memory_region>,
 			<&main_r5fss0_core0_memory_region>;
 };
 
 &main_r5fss0_core1 {
-	mboxes = <&mailbox0_cluster1>, <&mbox_main_r5fss0_core1>;
+	mboxes = <&mailbox0_cluster1 &mbox_main_r5fss0_core1>;
 	memory-region = <&main_r5fss0_core1_dma_memory_region>,
 			<&main_r5fss0_core1_memory_region>;
 };
 
 &main_r5fss1_core0 {
-	mboxes = <&mailbox0_cluster2>, <&mbox_main_r5fss1_core0>;
+	mboxes = <&mailbox0_cluster2 &mbox_main_r5fss1_core0>;
 	memory-region = <&main_r5fss1_core0_dma_memory_region>,
 			<&main_r5fss1_core0_memory_region>;
 };
 
 &main_r5fss1_core1 {
-	mboxes = <&mailbox0_cluster2>, <&mbox_main_r5fss1_core1>;
+	mboxes = <&mailbox0_cluster2 &mbox_main_r5fss1_core1>;
 	memory-region = <&main_r5fss1_core1_dma_memory_region>,
 			<&main_r5fss1_core1_memory_region>;
 };
 
 &c66_0 {
 	status = "okay";
-	mboxes = <&mailbox0_cluster3>, <&mbox_c66_0>;
+	mboxes = <&mailbox0_cluster3 &mbox_c66_0>;
 	memory-region = <&c66_0_dma_memory_region>,
 			<&c66_0_memory_region>;
 };
 
 &c66_1 {
 	status = "okay";
-	mboxes = <&mailbox0_cluster3>, <&mbox_c66_1>;
+	mboxes = <&mailbox0_cluster3 &mbox_c66_1>;
 	memory-region = <&c66_1_dma_memory_region>,
 			<&c66_1_memory_region>;
 };
 
 &c71_0 {
 	status = "okay";
-	mboxes = <&mailbox0_cluster4>, <&mbox_c71_0>;
+	mboxes = <&mailbox0_cluster4 &mbox_c71_0>;
 	memory-region = <&c71_0_dma_memory_region>,
 			<&c71_0_memory_region>;
 };