--- a/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts	2020-12-25 21:20:04.848721628 +0200
+++ b/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts	2020-12-26 18:57:00.289626975 +0200
@@ -191,6 +191,15 @@
 	cpu-supply = <&vdd_core>;
 };
 
+&cpu0_opp_table {
+	opp-1200000000 {
+		status = "okay";
+	};
+	opp-1296000000 {
+		status = "okay";
+	};
+};
+
 &emmc {
 	bus-width = <4>;  // Confirm if right value - <8>
 	cap-mmc-highspeed;