15.12.2021 18:52, Thierry Reding пишет: >>> On the other hand, at least Venice2 has a USB type A connector for this, >>> so I'm not even sure how that would work. I vaguely recall that the >>> Tegra20 Seaboard also had a USB type A and that it was possible to use >>> it in device mode, but I don't how that would. Nor would it be correct >>> to use the gpio-usb-b-connector compatible for that since, well, it's >>> not USB type B. >> I'm not sure whether it makes much sense to use OTG for USB type A >> connectors, normally they should be fixed to host mode. > My recollection is that those can be used in device mode as well. For > example that USB type A port on Venice2 (same as for Seaboard) can be > used for RCM, IIRC. It's possible that there's no way to detect what is > connected, though, so this may not be proper OTG. Sounds correct. >>> I suspect that Apalis has a micro-B port, much like the Jetson TK1. My >>> understanding is that OTG doesn't work on Jetson TK1 (which is why it's >>> configured in "host" mode), so it'd be interesting to see if this can be >>> made to work on Apalis. >> Looks like the default Apalis carrier board has three type A connectors. >> >> https://www.toradex.com/products/carrier-board/ixora-carrier-board > I'm wondering if the best thing would be to mark all of these as "host" > for now and avoid making this look like something that it isn't. I don't > think we've ever made OTG work on these boards, so perhaps we shouldn't > assume that it works. Marking them "host" should be correct, but that wasn't tested. I assume that those "OTG" ports may default to the host mode.
