diff --git a/arch/arm/boot/dts/sh73a0-kzm9g.dts b/arch/arm/boot/dts/sh73a0-kzm9g.dts
index e40a2f23b6cd..c2d8a080e392 100644
--- a/arch/arm/boot/dts/sh73a0-kzm9g.dts
+++ b/arch/arm/boot/dts/sh73a0-kzm9g.dts
@@ -149,6 +149,13 @@
 			label = "SW1";
 			wakeup-source;
 		};
+
+		wakeup-key {
+			gpios = <&pfc 159 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_WAKEUP>;
+			label = "NMI";
+			wakeup-source;
+		};
 	};
 
 	sound {