diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
index 5567e24ff99b..e02ff50fb48e 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
@@ -401,7 +401,7 @@ &emmc {
 &sgpiom0 {
 	status = "okay";
 	ngpios = <128>;
-	bus-frequency = <1000000>;
+	bus-frequency = <500000>;
 };
 
 &ibt {