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>

diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
index 2367a67c5f10bd3e99ce757dafed25dfa95ecb35..e114000a84f56c9e07ddd3a2e623c4dfeb3df6a2 100644 (file)
--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi
@@ -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>;
                        };