diff --git a/system/smolder/fan.dts b/system/smolder/fan.dts
index be364f9..38f80af 100644
--- a/system/smolder/fan.dts
+++ b/system/smolder/fan.dts
@@ -30,10 +30,12 @@
 				fan-supply = <&vcc12v_dcin>;
 				pwms = <&pwm12 0 50000 0>;
 				#cooling-cells = <2>;
+				pulses-per-revolution = <2>;
+				interrupt-parent = <&gpio3>;
+				interrupts = <RK_PC3 IRQ_TYPE_EDGE_FALLING>;
 			};
 		};
 	};
-
 	fragment@2 {
 		target = <&pwm12>;
 		__overlay__ {