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

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Date:	Thu, 10 Dec 2015 11:13:24 -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,

Felipe Balbi <balbi@...com> writes:
> Felipe Balbi <balbi@...com> writes:
>> 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 ?
>
> 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 ?

cheers

-- 
balbi

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