diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts b/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts
index dcca026446d8..a1644ceed154 100644
--- a/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts
+++ b/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts
@@ -317,6 +317,8 @@ temperature-sensor@4c {
 			rtc@51 {
 				compatible = "nxp,pcf2129";
 				reg = <0x51>;
+				/* IRQ_RTC_B -> IRQ11_B(CPLD) -> IRQ11(CPU), active low */
+				interrupts-extended = <&extirq 11 IRQ_TYPE_LEVEL_LOW>;
 			};
 		};
 	};