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

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Message-ID: <87egeujl0r.fsf@saruman.tx.rr.com>
Date:	Thu, 10 Dec 2015 11:01:08 -0600
From:	Felipe Balbi <balbi@...com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Ruslan Bilovol <ruslan.bilovol@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v7 0/4] usb/gadget: independent registration of gadgets and gadget drivers


Hi,

Marek Szyprowski <m.szyprowski@...sung.com> writes:
> Hello,
>
> 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 ?

-- 
balbi

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