Hi, On Tue, Jan 10, 2017 at 01:01:20AM +0800, Chen-Yu Tsai wrote: > On Tue, Jan 10, 2017 at 12:46 AM, Maxime Ripard > <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > > All the controllers can have a maximum frequency of 200MHz. > > > > Since older SoCs cannot go that high, we cannot change the default maximum > > frequency, but fortunately for us we have a property for that in the DT. > > > > This also has the side effect of allowing to use the MMC HS200 mode for the > > boards that support it (with either 1.2v or 1.8v IOs). > > > > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > > --- > > arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 3 +++ > > 1 file changed, 3 insertions(+), 0 deletions(-) > > > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > > index 8e149498e096..f46ae965cf5b 100644 > > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > > @@ -332,6 +332,7 @@ > > resets = <&ccu RST_BUS_MMC0>; > > reset-names = "ahb"; > > interrupts = <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>; > > + max-frequency = <200000000>; > > You also have to set one of MMC_CAP2_HS200* in the driver, > or mmc-hs200-1_8v or mmc-hs200-1_2v in the device tree to > actually use HS200, right? Yes, but that requires a board with 1.8V IOs to work properly, which not all board use, so it's probably best to enable it in the board DTS. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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