diff --git a/arch/arm64/boot/dts/renesas/r8a774b1-hihope-rzg2n.dts b/arch/arm64/boot/dts/renesas/r8a774b1-hihope-rzg2n.dts
index 094b5ef50a8d..c9e2119de1f0 100644
--- a/arch/arm64/boot/dts/renesas/r8a774b1-hihope-rzg2n.dts
+++ b/arch/arm64/boot/dts/renesas/r8a774b1-hihope-rzg2n.dts
@@ -24,3 +24,7 @@ memory@480000000 {
 		reg = <0x4 0x80000000 0x0 0x80000000>;
 	};
 };
+
+&sdhi3 {
+	mmc-hs400-1_8v;
+};