u-boot/arch/arm/dts/rk3188-radxarock-u-boot.dtsi
Heiko Stuebner 598a26a8fb 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>
2018-10-02 09:35:19 +02:00

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Text

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Fuzhou Rockchip Electronics Co., Ltd.
*/
&cru {
u-boot,dm-spl;
};
&pinctrl {
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;
};
&timer3 {
compatible = "rockchip,rk3368-timer", "rockchip,rk3288-timer";
u-boot,dm-spl;
clock-frequency = <24000000>;
};