On Wed, Jan 11, 2017 at 3:15 AM, Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > 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. It's limited by the vqmmc regulator. Either way the host controller supports it right? ChenYu -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
