Messages in this thread | | | Subject | Re: [PATCH v7 0/4] usb/gadget: independent registration of gadgets and gadget drivers | From | Marek Szyprowski <> | Date | Fri, 11 Dec 2015 10:37:26 +0100 |
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Hello,
On 2015-12-10 18:13, Felipe Balbi wrote: > Felipe Balbi <balbi@ti.com> writes: >> Felipe Balbi <balbi@ti.com> writes: >>> Marek Szyprowski <m.szyprowski@samsung.com> 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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