diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
index 6930efff8a5a..d1ca00c83d1c 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
@@ -29,6 +29,108 @@ secure_ddr: optee@9e800000 {
 			alignment = <0x1000>;
 			no-map;
 		};
+
+		mcu_r5fss0_core0_dma_memory_region: r5f-dma-memory@a0000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa0000000 0x00 0x100000>;
+			no-map;
+		};
+
+		mcu_r5fss0_core0_memory_region: r5f-memory@a0100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa0100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		mcu_r5fss0_core1_dma_memory_region: r5f-dma-memory@a1000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa1000000 0x00 0x100000>;
+			no-map;
+		};
+
+		mcu_r5fss0_core1_memory_region: r5f-memory@a1100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa1100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		main_r5fss0_core0_dma_memory_region: r5f-dma-memory@a2000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa2000000 0x00 0x100000>;
+			no-map;
+		};
+
+		main_r5fss0_core0_memory_region: r5f-memory@a2100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa2100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		main_r5fss0_core1_dma_memory_region: r5f-dma-memory@a3000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa3000000 0x00 0x100000>;
+			no-map;
+		};
+
+		main_r5fss0_core1_memory_region: r5f-memory@a3100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa3100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		main_r5fss1_core0_dma_memory_region: r5f-dma-memory@a4000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa4000000 0x00 0x100000>;
+			no-map;
+		};
+
+		main_r5fss1_core0_memory_region: r5f-memory@a4100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa4100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		main_r5fss1_core1_dma_memory_region: r5f-dma-memory@a5000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa5000000 0x00 0x100000>;
+			no-map;
+		};
+
+		main_r5fss1_core1_memory_region: r5f-memory@a5100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa5100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		c71_0_dma_memory_region: c71-dma-memory@a6000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa6000000 0x00 0x100000>;
+			no-map;
+		};
+
+		c71_0_memory_region: c71-memory@a6100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa6100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		c71_1_dma_memory_region: c71-dma-memory@a7000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa7000000 0x00 0x100000>;
+			no-map;
+		};
+
+		c71_1_memory_region: c71-memory@a7100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa7100000 0x00 0xf00000>;
+			no-map;
+		};
+
+		rtos_ipc_memory_region: ipc-memories@a8000000 {
+			reg = <0x00 0xa8000000 0x00 0x01c00000>;
+			alignment = <0x1000>;
+			no-map;
+		};
 	};
 
 	transceiver0: can-phy0 {
@@ -79,3 +181,187 @@ &main_mcan16 {
 	pinctrl-names = "default";
 	phys = <&transceiver0>;
 };
+
+&mailbox0_cluster0 {
+	interrupts = <436>;
+
+	mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 {
+		ti,mbox-rx = <0 0 0>;
+		ti,mbox-tx = <1 0 0>;
+	};
+
+	mbox_mcu_r5fss0_core1: mbox-mcu-r5fss0-core1 {
+		ti,mbox-rx = <2 0 0>;
+		ti,mbox-tx = <3 0 0>;
+	};
+};
+
+&mailbox0_cluster1 {
+	interrupts = <432>;
+
+	mbox_main_r5fss0_core0: mbox-main-r5fss0-core0 {
+		ti,mbox-rx = <0 0 0>;
+		ti,mbox-tx = <1 0 0>;
+	};
+
+	mbox_main_r5fss0_core1: mbox-main-r5fss0-core1 {
+		ti,mbox-rx = <2 0 0>;
+		ti,mbox-tx = <3 0 0>;
+	};
+};
+
+&mailbox0_cluster2 {
+	interrupts = <428>;
+
+	mbox_main_r5fss1_core0: mbox-main-r5fss1-core0 {
+		ti,mbox-rx = <0 0 0>;
+		ti,mbox-tx = <1 0 0>;
+	};
+
+	mbox_main_r5fss1_core1: mbox-main-r5fss1-core1 {
+		ti,mbox-rx = <2 0 0>;
+		ti,mbox-tx = <3 0 0>;
+	};
+};
+
+&mailbox0_cluster3 {
+	status = "disabled";
+};
+
+&mailbox0_cluster4 {
+	interrupts = <420>;
+
+	mbox_c71_0: mbox-c71-0 {
+		ti,mbox-rx = <0 0 0>;
+		ti,mbox-tx = <1 0 0>;
+	};
+
+	mbox_c71_1: mbox-c71-1 {
+		ti,mbox-rx = <2 0 0>;
+		ti,mbox-tx = <3 0 0>;
+	};
+};
+
+&mailbox0_cluster5 {
+	status = "disabled";
+};
+
+&mailbox0_cluster6 {
+	status = "disabled";
+};
+
+&mailbox0_cluster7 {
+	status = "disabled";
+};
+
+&mailbox0_cluster8 {
+	status = "disabled";
+};
+
+&mailbox0_cluster9 {
+	status = "disabled";
+};
+
+&mailbox0_cluster10 {
+	status = "disabled";
+};
+
+&mailbox0_cluster11 {
+	status = "disabled";
+};
+
+&mailbox1_cluster0 {
+	status = "disabled";
+};
+
+&mailbox1_cluster1 {
+	status = "disabled";
+};
+
+&mailbox1_cluster2 {
+	status = "disabled";
+};
+
+&mailbox1_cluster3 {
+	status = "disabled";
+};
+
+&mailbox1_cluster4 {
+	status = "disabled";
+};
+
+&mailbox1_cluster5 {
+	status = "disabled";
+};
+
+&mailbox1_cluster6 {
+	status = "disabled";
+};
+
+&mailbox1_cluster7 {
+	status = "disabled";
+};
+
+&mailbox1_cluster8 {
+	status = "disabled";
+};
+
+&mailbox1_cluster9 {
+	status = "disabled";
+};
+
+&mailbox1_cluster10 {
+	status = "disabled";
+};
+
+&mailbox1_cluster11 {
+	status = "disabled";
+};
+
+&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>;
+	memory-region = <&mcu_r5fss0_core1_dma_memory_region>,
+			<&mcu_r5fss0_core1_memory_region>;
+};
+
+&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>;
+	memory-region = <&main_r5fss0_core1_dma_memory_region>,
+			<&main_r5fss0_core1_memory_region>;
+};
+
+&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>;
+	memory-region = <&main_r5fss1_core1_dma_memory_region>,
+			<&main_r5fss1_core1_memory_region>;
+};
+
+&c71_0 {
+	mboxes = <&mailbox0_cluster4 &mbox_c71_0>;
+	memory-region = <&c71_0_dma_memory_region>,
+			<&c71_0_memory_region>;
+};
+
+&c71_1 {
+	mboxes = <&mailbox0_cluster4 &mbox_c71_1>;
+	memory-region = <&c71_1_dma_memory_region>,
+			<&c71_1_memory_region>;
+};
