Lower the dw_mmc host clock from 400 MHz to 100 MHz because there are a lot of MMC errors above 100 MHz. Enable frequency scaling to reduce energy consumption. In idle this reduced energy consumption by 2.6% (from 119.5 mA to 116.4 mA). Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> --- arch/arm/boot/dts/exynos4412-trats2.dts | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts index 29231b452643..21f1236ae979 100644 --- a/arch/arm/boot/dts/exynos4412-trats2.dts +++ b/arch/arm/boot/dts/exynos4412-trats2.dts @@ -558,7 +558,9 @@ non-removable; card-detect-delay = <200>; vmmc-supply = <&vemmc_reg>; - clock-frequency = <400000000>; + clock-frequency = <100000000>; + clock-freq-min-max = <400000 100000000>; + frequency-scaling; samsung,dw-mshc-ciu-div = <0>; samsung,dw-mshc-sdr-timing = <2 3>; samsung,dw-mshc-ddr-timing = <1 2>; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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