On Thu, Jun 29, 2023 at 08:34:10PM +0100, Andre Przywara wrote:
> > > > +&usbphy {
> > > > + usb0_id_det-gpios = <&pio 5 6 GPIO_ACTIVE_HIGH>;
>
> Where is this pin connected to, in the USB-C connector? One of the CC
> pins?
>
> > > > + status = "okay";
> > >
> > > So in the commit message you say "USB-C for power", but this here
> > > describes a full featured USB port. So does that work? Can you use it as a
> > > gadget, but also as a host?
> >
> > Yes, it's an OTG port with the ID pin pulled to ground.
>
> Do you mean both CC pins? IIRC this means it's hardwired as a
> peripheral (UFP).
>
> If I ignore the ID pin above, this looks like on the OrangePi Zero2 or
> the MangoPi MQ-R. In those cases we put peripheral in the DT, as this
> is what this connection seems to indicate. That *can* be used a host as
> well, with the "right" cable, but it's not really a well supported
> configuration, so we leave this up to people to change this locally,
> should they really desire so.
The ID pin above is exactly what makes "the right cable" works:
depending on the state of the ID pin the controller will act either as a
peripheral or a host. Dual-mode works just fine, so if the hardware
supports it there's no reason not to enable it.
Maxime
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