diff --git a/arch/arm/boot/dts/stih407-family.dtsi b/arch/arm/boot/dts/stih407-family.dtsi
index 54963f89b59a..9ce657d69102 100644
--- a/arch/arm/boot/dts/stih407-family.dtsi
+++ b/arch/arm/boot/dts/stih407-family.dtsi
@@ -808,6 +808,9 @@ st231_gp0: remote-processor {
 			clocks		= <&clk_s_c0_flexgen CLK_ST231_GP_0>;
 			clock-frequency	= <600000000>;
 			st,syscfg	= <&syscfg_core 0x22c>;
+			#mbox-cells = <1>;
+			mbox-names = "vq0_rx", "vq0_tx", "vq1_rx", "vq1_tx";
+			mboxes = <&mailbox0 0 2>, <&mailbox2 0 1>, <&mailbox0 0 3>, <&mailbox2 0 0>;
 		};
 
 		st231_delta: remote-processor {