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rockchip: rk3188: add u-boot-specific mmc properties

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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>
This commit is contained in:
Heiko Stuebner 2018-09-21 10:59:47 +02:00 committed by Philipp Tomsich
parent 26a52f3473
commit 598a26a8fb
1 changed files with 15 additions and 0 deletions
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15
arch/arm/dts/rk3188-radxarock-u-boot.dtsi
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@ -11,6 +11,21 @@
u-boot,dm-spl; u-boot,dm-spl;
}; };
&mmc0 {
fifo-mode;
max-frequency = <16000000>;
};
&mmc1 {
fifo-mode;
max-frequency = <16000000>;
};
&emmc {
fifo-mode;
max-frequency = <16000000>;
};
&uart2 { &uart2 {
status = "okay"; status = "okay";
u-boot,dm-spl; u-boot,dm-spl;