Hi Tom, Pali,
On 25/07/2021 15:43, Tom Rini wrote:
On Sun, Jul 25, 2021 at 12:40:13PM +0200, Merlijn Wajer wrote:
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... 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.
A couple of months sounds great, thanks!
It's been a bit longer than that, but I am starting with it today. It shouldn't take too long at this point. Sorry for the delay.
Regards, Merlijn