15.12.2021 18:52, Thierry Reding пишет:

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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.

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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.