diff --git a/arch/arm/boot/dts/sun9i-a80-optimus.dts b/arch/arm/boot/dts/sun9i-a80-optimus.dts
index fd874ded890e..caf0091e71ba 100644
--- a/arch/arm/boot/dts/sun9i-a80-optimus.dts
+++ b/arch/arm/boot/dts/sun9i-a80-optimus.dts
@@ -325,6 +325,10 @@ reg_ldo_io1: ldo_io1 {
 			reg_rtc_ldo: rtc_ldo {
 				regulator-name = "vcc-rtc-vdd1v8-io";
 			};
+
+			sw {
+				/* unused */
+			};
 		};
 	};