From 598a26a8fb94b7b86ecd2f4762eb5fcf46b9664e Mon Sep 17 00:00:00 2001
From: Heiko Stuebner <heiko@sntech.de>
Date: Fri, 21 Sep 2018 10:59:47 +0200
Subject: [PATCH] rockchip: rk3188: add u-boot-specific mmc properties
The dwmmc controllers on rk3188 do not have idma support, so need to
use the fifo-mode and it my tests they became confused and stopped
working if the frequency was to high.
While I only tested in somewhat bigger steps, 32MHz for example
hung the controller, while reducing it to 16MHz worked just fine
and is reasonably fast to load a kernel from mmc.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
---
arch/arm/dts/rk3188-radxarock-u-boot.dtsi | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
index 013535abcd..1bb5408592 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;
--
2.39.5