diff --git a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
index 013535a..1bb5408 100644
--- a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
+++ b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
@@ -11,6 +11,21 @@
 	u-boot,dm-spl;
 };
 
+&mmc0 {
+	fifo-mode;
+	max-frequency = <16000000>;
+};
+
+&mmc1 {
+	fifo-mode;
+	max-frequency = <16000000>;
+};
+
+&emmc {
+	fifo-mode;
+	max-frequency = <16000000>;
+};
+
 &uart2 {
 	status = "okay";
 	u-boot,dm-spl;