diff --git a/arch/arm/boot/dts/dra7-ipu-dsp-common.dtsi b/arch/arm/boot/dts/dra7-ipu-dsp-common.dtsi
index 478a07e295385..8a53da1c5f2eb 100644
--- a/arch/arm/boot/dts/dra7-ipu-dsp-common.dtsi
+++ b/arch/arm/boot/dts/dra7-ipu-dsp-common.dtsi
@@ -19,3 +19,15 @@
 		status = "okay";
 	};
 };
+
+&ipu2 {
+	mboxes = <&mailbox6 &mbox_ipu2_ipc3x>;
+};
+
+&ipu1 {
+	mboxes = <&mailbox5 &mbox_ipu1_ipc3x>;
+};
+
+&dsp1 {
+	mboxes = <&mailbox5 &mbox_dsp1_ipc3x>;
+};
diff --git a/arch/arm/boot/dts/dra74-ipu-dsp-common.dtsi b/arch/arm/boot/dts/dra74-ipu-dsp-common.dtsi
index 645063d0df136..6e31c1c27fd48 100644
--- a/arch/arm/boot/dts/dra74-ipu-dsp-common.dtsi
+++ b/arch/arm/boot/dts/dra74-ipu-dsp-common.dtsi
@@ -10,3 +10,7 @@
 		status = "okay";
 	};
 };
+
+&dsp2 {
+	mboxes = <&mailbox6 &mbox_dsp2_ipc3x>;
+};