arm64: dts: imx8mm-beacon: Fix HS400 USDHC clock speed

The reference manual for the i.MX8MM states the clock rate in
MMC mode is 1/2 of the input clock, therefore to properly run
at HS400 rates, the input clock must be 400MHz to operate at
200MHz.  Currently the clock is set to 200MHz which is half the
rate it should be, so the throughput is half of what it should be
for HS400 operation.

Fixes: 593816fa2f35 ("arm64: dts: imx: Add Beacon i.MX8m-Mini development kit")
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
index 21bcd82fd092f271b3f5e4ecac52478ad7176ce0..8287a7f66ed372ada0fe4d34cf0a43f43284d377 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
@@ -294,6 +294,8 @@
        pinctrl-0 = <&pinctrl_usdhc3>;
        pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
        pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
+       assigned-clocks = <&clk IMX8MM_CLK_USDHC3>;
+       assigned-clock-rates = <400000000>;
        bus-width = <8>;
        non-removable;
        status = "okay";