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 11:09:20 -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:
> 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 ;-)

-- 
balbi

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