[PATCH v2 3/4] arm64: add support for i.MX8M EVK board

[Lucas Stach]

Am Freitag, den 23.02.2018, 16:30 +0100 schrieb Juergen Borleis:
> On Friday 23 February 2018 16:03:53 Shawn Guo wrote:
> > On Thu, Feb 01, 2018 at 07:31:25PM +0100, Lucas Stach wrote:
> > > +&usdhc1 {
> > > +   pinctrl-names = "default", "state_100mhz", "state_200mhz";
> > > +   pinctrl-0 = <&pinctrl_usdhc1_cd_reset>,
> <&pinctrl_usdhc1_clk_strobe>,
> > > +               <&pinctrl_usdhc1_data>;
> > > +   pinctrl-1 = <&pinctrl_usdhc1_cd_reset>,
> > > +               <&pinctrl_usdhc1_clk_strobe_100mhz>,
> > > +               <&pinctrl_usdhc1_data_100mhz>;
> > > +   pinctrl-2 = <&pinctrl_usdhc1_cd_reset>,
> > > +               <&pinctrl_usdhc1_clk_strobe_200mhz>,
> > > +               <&pinctrl_usdhc1_data_200mhz>;
> > > +   vqmmc-supply = <&sw4_reg>;
> > > +   bus-width = <8>;
> > > +   non-removable;
> > > +   no-sd;
> > > +   no-sdio;
> > > +   status = "okay";
> > > +};
> >
> > I'm not sure it can be enabled right now.  Per my testing, eMMC is
> not
> > working yet.
> >
> > [    0.879756] mmc0: Switching to 3.3V signalling voltage failed
> > [    0.913587] mmc0: SDHCI controller on 30b40000.usdhc
> [30b40000.usdhc]
> > using ADMA ...
> > [    1.007628] mmc0: switch to high-speed from hs200 failed, err:-
> 110
> > [    1.013873] mmc0: error -110 whilst initialising MMC card
> > [    1.020639] mmc0: Switching to 3.3V signalling voltage failed
> > ...
> > [    1.132462] mmc0: switch to high-speed from hs200 failed, err:-
> 110
> > [    1.138674] mmc0: error -110 whilst initialising MMC card
> > [    1.145394] mmc0: Switching to 3.3V signalling voltage failed
> > [    1.268367] mmc0: switch to high-speed from hs200 failed, err:-
> 110
> > [    1.274576] mmc0: error -110 whilst initialising MMC card
> > [    1.281291] mmc0: Switching to 3.3V signalling voltage failed
> > [    1.440708] mmc0: switch to high-speed from hs200 failed, err:-
> 110
> > [    1.446919] mmc0: error -110 whilst initialising MMC card
> >
> > Or am I missing anything?
> 
> Property "no-1-8-v;" if no 1.8 V is available?

The issue is the other way around: the eMMC is hardwired to 1.8V IO
voltage (which is fine per eMMC spec), so it can't switch to 3.3V mode.

Regards,
Lucas