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ARC: [plat-axs10x] sdio: Temporary fix of sdio ciu frequency 

DW sdio controller has external ciu clock divider controlled
via register in SDIO IP. It divides sdio_ref_clk
(which comes from CGU) by 16 for default. So default mmcclk
clock (which comes to sdk_in) is 25000000 Hz.

So fix wrong current value (50000000 Hz) to actual 25000000 Hz.

Note this is a preventive fix, in line with similar change for HSDK
where this was actually needed. see:
http://lists.infradead.org/pipermail/linux-snps-arc/2017-September/002924.html

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
hifive-unleashed-5.1
Eugeniy Paltsev 2017-09-12 21:20:45 +03:00 committed by Vineet Gupta
parent 6afa3bcf1f
commit 976e78a522
1 changed files with 8 additions and 1 deletions
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9
arch/arc/boot/dts/axs10x_mb.dtsi
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@ -44,7 +44,14 @@
mmcclk: mmcclk {
compatible = "fixed-clock";
clock-frequency = <50000000>;
/*
* DW sdio controller has external ciu clock divider
* controlled via register in SDIO IP. It divides
* sdio_ref_clk (which comes from CGU) by 16 for
* default. So default mmcclk clock (which comes
* to sdk_in) is 25000000 Hz.
*/
clock-frequency = <25000000>;
#clock-cells = <0>;
};