diff --git a/arch/arm/dts/rk3399-firefly-u-boot.dtsi b/arch/arm/dts/rk3399-firefly-u-boot.dtsi
index 1f5fda1d0f1..ca7a6694bcb 100644
--- a/arch/arm/dts/rk3399-firefly-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-firefly-u-boot.dtsi
@@ -6,6 +6,12 @@
 #include "rk3399-u-boot.dtsi"
 #include "rk3399-sdram-ddr3-1600.dtsi"
 
+&sdmmc {
+	max-frequency = <25000000>;  /* 25MHz for SD-wire compatibility */
+	/delete-property/ cap-sd-highspeed;
+	/delete-property/ cap-mmc-highspeed;
+};
+
 &vdd_log {
 	regulator-init-microvolt = <950000>;
 };