diff --git a/arch/arm64/boot/dts/apm/apm-shadowcat.dtsi b/arch/arm64/boot/dts/apm/apm-shadowcat.dtsi
index 66b394220b69..04d83a163e85 100644
--- a/arch/arm64/boot/dts/apm/apm-shadowcat.dtsi
+++ b/arch/arm64/boot/dts/apm/apm-shadowcat.dtsi
@@ -453,6 +453,25 @@ edacsoc@7e930000 {
 			};
 		};
 
+		mailbox: mailbox@10540000 {
+			compatible = "apm,xgene-slimpro-mbox";
+			reg = <0x0 0x10540000 0x0 0x8000>;
+			#mbox-cells = <1>;
+			interrupts =   <0x0 0x0 0x4
+					0x0 0x1 0x4
+					0x0 0x2 0x4
+					0x0 0x3 0x4
+					0x0 0x4 0x4
+					0x0 0x5 0x4
+					0x0 0x6 0x4
+					0x0 0x7 0x4>;
+		};
+
+		i2cslimpro {
+			compatible = "apm,xgene-slimpro-i2c";
+			mboxes = <&mailbox 0>;
+		};
+
 		serial0: serial@10600000 {
 			device_type = "serial";
 			compatible = "ns16550";
diff --git a/arch/arm64/boot/dts/apm/apm-storm.dtsi b/arch/arm64/boot/dts/apm/apm-storm.dtsi
index 0f733da41c03..5ceb3e4fc44f 100644
--- a/arch/arm64/boot/dts/apm/apm-storm.dtsi
+++ b/arch/arm64/boot/dts/apm/apm-storm.dtsi
@@ -691,6 +691,25 @@ pcie4: pcie@1f510000 {
 			msi-parent = <&msi>;
 		};
 
+		mailbox: mailbox@10540000 {
+			compatible = "apm,xgene-slimpro-mbox";
+			reg = <0x0 0x10540000 0x0 0xa000>;
+			#mbox-cells = <1>;
+			interrupts =    <0x0 0x0 0x4>,
+					<0x0 0x1 0x4>,
+					<0x0 0x2 0x4>,
+					<0x0 0x3 0x4>,
+					<0x0 0x4 0x4>,
+					<0x0 0x5 0x4>,
+					<0x0 0x6 0x4>,
+					<0x0 0x7 0x4>;
+		};
+
+		i2cslimpro {
+			compatible = "apm,xgene-slimpro-i2c";
+			mboxes = <&mailbox 0>;
+		};
+
 		serial0: serial@1c020000 {
 			status = "disabled";
 			device_type = "serial";