From 598a26a8fb94b7b86ecd2f4762eb5fcf46b9664e Mon Sep 17 00:00:00 2001 From: Heiko Stuebner 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 Reviewed-by: Philipp Tomsich Acked-by: Philipp Tomsich --- 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