On Thu, Nov 02, 2017 at 05:07:30PM +0800, Icenowy Zheng wrote:
> > > +&mmc0 {
> > > + pinctrl-names = "default";
> > > + pinctrl-0 = <&mmc0_pins_a>;
> > > + vmmc-supply = <®_vcc3v3>;
> > > + bus-width = <4>;
> > > + /*
> > > + * In different revisions the board have different card detect
> > > + * configuration.
> > > + */
> >
> > Which ones?
>
> In the sample batch (1.2V fixed voltage) the card detect is normal
> (PF6 low as inserted), however in the final batch (1.1V/1.3V
> switchable) it's inverted at PF6 (high as inserted).
Then just use the final version's.
> > > +&usbphy {
> > > + usb0_id_det-gpios = <&r_pio 0 6 GPIO_ACTIVE_HIGH>; /* PL6 */
> > > + /* USB OTG VBUS is directly connected to 5V without any regulators
> > > */
> >
> > So it cannot operate in OTG, but it's host only?
>
> It can operate in OTG -- you can power the board via the OTG port,
> as the VBUS is not gated from 5V at all, so 5V power at VBUS will
> power up the board. Yes, it's a bit unsafe, but the board designer
> did it.
What will provide the 5v in the first place then if a USB device is
connected to the micro-USB connector?
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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