linux-kernel - Re: [PATCH v4 1/5] gadget: Introduce the notifier functions

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Date:	Thu, 8 Oct 2015 17:51:01 +0200
From:	Pavel Machek <pavel@....cz>
To:	Felipe Balbi <balbi@...com>
Cc:	Mark Brown <broonie@...nel.org>,
	Baolin Wang <baolin.wang@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>, sre@...nel.org,
	dbaryshkov@...il.com, dwmw2@...radead.org,
	peter.chen@...escale.com, stern@...land.harvard.edu,
	r.baldyga@...sung.com, sojka@...ica.cz,
	yoshihiro.shimoda.uh@...esas.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, sameo@...ux.intel.com,
	lee.jones@...aro.org, ckeepax@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, linux-pm@...r.kernel.org,
	device-mainlining@...ts.linuxfoundation.org
Subject: Re: [PATCH v4 1/5] gadget: Introduce the notifier functions

Hi!

> > What's the advantage of pushing this to userspace?  By the time we
> > provide enough discoverability to enable userspace to configure itself
> > it seems like we'd have enough information to do the job anyway.
> 
> you're going to be dealing with a setup where each vendor does one thing
> differently. Some will have it all in the SoC part of a single IP (dwc3 can be
> configured that way), some will push it out to companion IC, some might even use
> some mostly discrete setup and so on...
> 
> We're gonna be dealing with a decision that involves information from multiple
> subsystems (USB, regulator, hwmon, power supply to name a few).
> 
> We tried doing it all in the kernel back in N800, N810 and N900/N9 days and it's
> just plain difficult. To make matters worse, N900 had two USB PHYs, one for
> actual runtime use and another just for detecting the charger type on the other
> end.

N900 does charging from kernel these days.

Not being able to boot generic distribution would be regression there...

										Pavel
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