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Author: Merlijn Wajer
To: Tom Rini, u-boot, Pali Rohár, maemo-leste, Ivaylo Dimitrov
CC: Marek Vasut
Subject: Re: [maemo-leste] Nokia RX51 U-Boot USB support updates?
Hi Tom,

On 13/07/2021 22:33, Tom Rini wrote:
> Hey all,
> So, the DM_USB migration deadline issue has been addressed by the series
> here:
> https://patchwork.ozlabs.org/project/uboot/list/?series=252793&state=*
> which splits out host and gadget support from the CONFIG_USB symbol
> itself. The migration deadline was for host support, and as noted, N900
> is gadget only. That particular issue is resolved.

Thanks a lot for doing that!

> But investigating that issue lead me to figure out some other problems,
> that I do need someone to say how will be addressed. Now that the other
> board removal series has been applied, and then with:
> https://patchwork.ozlabs.org/project/uboot/patch/20210708014348.4010-1-trini@konsulko.com/
> also applied (for which the maintainer is happy to take), this brings
> N900 as the last and only user of the "old" musb driver (the "new" musb
> driver is now almost 9 years old) and also the last and only user of the
> usbtty driver.
> I suspect that moving to the "new" MUSB driver, for gadget only, and
> with that enabling DM_USB_GADGET should be a mechanical affair, so long
> as you can fit within the space constraints of the platform. I'm not
> immediately sure how hard it will be to update usbtty.c to modern gadget
> APIs. If there are size problems, then, well, we need solutions
> proposed (it's possible that some of the usb-uclass.c code is host-only
> and needs moving, but that likely won't stop gadget from needing it for
> gadget related information, to bring up a specific example).
> It's also likely that the MUSB support needs a little further
> clean-up for supporting building as gadget-only when there's some common
> code under a host-only check.
> What I would like is for someone to step forward and say they'll pick up
> this work. Is there an immediate deadline? No. I don't think that
> would be helpful. I'm not going to dictate how long it takes for
> someone to do the work, that's for the person doing the work to say how
> long they think it'll take.

I have a nokia serial device for the N900, which makes debugging
significantly easier. I have some experience with u-boot (not that much
with u-boot on omap though), but I imagine that Ivaylo and/or Pali can
help me if I run into problems. So I'll try to pick this up.

As for a time frame, I imagine I should be able to find some time for
this in the next couple of months.