diff --git a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
index 3ab25ad402b9..65a3ff4da610 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
+++ b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
@@ -126,6 +126,14 @@
 
 		dsa,member = <0 0>;
 
+		interrupt-parent = <&gpiosb>;
+		/* Actually, the irq is active low but gpiosb doesn't
+		   support that.  Falling edge seems to work okay.
+		   We need this for ptp support */
+		interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;