From 0b1a5b30d6d8ad2af9f5518b65fbbdc9e080d41d Mon Sep 17 00:00:00 2001
From: Peter Robinson <pbrobinson@gmail.com>
Date: Mon, 20 Apr 2020 22:03:00 +0100
Subject: [PATCH] rockpro64: limit speed on mSD slot

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
---
 arch/arm/dts/rk3399-rockpro64-u-boot.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
index deaa3efd39..e5e05f5a7f 100644
--- a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
@@ -19,6 +19,10 @@
 	status = "okay";
 };
 
+&sdmmc {
+	max-frequency = <20000000>;
+};
+
 &vdd_center {
 	regulator-min-microvolt = <950000>;
 	regulator-max-microvolt = <950000>;
-- 
2.26.1