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 <[email protected]>
Reviewed-by: Philipp Tomsich <[email protected]>
Acked-by: Philipp Tomsich <[email protected]>

diff --git a/arch/arm/dts/rk3188-radxarock-u-boot.dtsi b/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
index 013535abcd2d226aaf2abae340c13cf1593bb6ff..1bb5408592e7e4d5c82aecc1985834e73956b012 100644 (file)
--- 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;