Re: [PATCH v7 0/4] usb/gadget: independent registration of gadgets and gadget drivers

[Marek Szyprowski]

Hello,

On 2015-12-10 18:13, Felipe Balbi wrote:
> Felipe Balbi <balbi@xxxxxx> writes:
> > Felipe Balbi <balbi@xxxxxx> writes:
> > > Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> writes:
> > > > This is a resurrection of the patches initially submitted by Ruslan
> > > > Bilovol in the following thread: https://lkml.org/lkml/2015/6/22/554
> > > >
> > > > The changes since the original submission (v5) includes rebase onto
> > > > latest linux-next branch, simplification of the code requested by Alan
> > > > Stern and Felipe Balbi, removal of a patch, which deleted __init/__exit
> > > > attributes (this change has been already merged) and fixes of the
> > > > checkpatch issues.
> > > >
> > > > This feature is urgently needed, because it is not longer possible to
> > > > use workaround to avoid deferred probe in UDC drivers due to
> > > > not-yet-probed i2c regulator drivers (for more information see
> > > > https://lkml.org/lkml/2015/10/30/374 ).
> > > >
> > > > This patchset has been successfully tested on Odroid XU3 boards with
> > > > DWC3 UDC driver being deferred by missing regulator drivers.
> > > there is one problem with this patchset. If I try to statically link
> > > gadget drivers, only one can be chosen, even though I can enable both
> > > dwc3 and dummy_hcd just fine. And, actually, this brings another
> > > problem. How do we handle systems which have 2 USB peripheral
> > > controllers (say, 2 instances of dwc3) and choose which gadget driver
> > > will bind to which controller ?
> > We also seem to have issues with Kconfig. If I try to make gadget driver
> > built-in, when compiling I'll get asked again if I want gadget drivers
> > built-in.
> >
> > Another one: I just tried dummy_hcd built-in, g_zero built-in, dwc3 as a
> > module. I can never load anything to dwc3 ;-)
> In all fairness, none of these are regressions. Can we agree to look at
> these during v4.5-rc so maybe v4.6 has a final solution ?

IMHO solving all the above issues requires reviving one of the previously
abandoned gadget-bus patch series, i.e.
http://thread.gmane.org/gmane.linux.usb.general/109745

Is this an approach You are interested in?

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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