rockchip: rk3188: add u-boot-specific mmc properties
From: Heiko Stuebner <heiko@...> Date: Fri, 21 Sep 2018 10:07:02 +0200
Commit-Message
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@...>
Patch-Comment
arch/arm/dts/rk3188-radxarock-u-boot.dtsi | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
Statistics
- 15 lines added
- 0 lines removed
Changes
------------------ arch/arm/dts/rk3188-radxarock-u-boot.dtsi -------------------
index 013535abcd..1bb5408592 100644
@@ -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;