Nokia RX51 U-Boot USB support updates?

[Merlijn Wajer]

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@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.
> 
> 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