On Fri, Jun 30, 2023 at 10:16:35AM +0200, Maxime Ripard wrote:
> 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.
Right, I'll have it as dr_mode = "otg".
Since I have neither schematics nor a proper devicetree I'll have to
expend some additional effort on this port, just as soon as I get the
panel working. :-)
>
> Maxime
