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

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Message-ID: <20151001180109.GI4469@saruman.tx.rr.com>
Date:	Thu, 1 Oct 2015 13:01:09 -0500
From:	Felipe Balbi <balbi@...com>
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

On Thu, Oct 01, 2015 at 12:58:49PM -0500, Felipe Balbi wrote:
> Hi,
> 
> On Thu, Oct 01, 2015 at 06:43:08PM +0100, Mark Brown wrote:
> > On Thu, Oct 01, 2015 at 12:29:32PM -0500, Felipe Balbi wrote:
> > 
> > > Frankly, I wanted all of this to be decided in userland with the
> > > kernel just providing notification and basic safety checks (we don't
> > > want to allow a bogus userspace daemon frying anybody's devices).
> > 
> > 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

oh, and as for dwc3 itself: it *can* be configured that way, but all those
charging blocks are optional :-) So you will even have setups where the very
same IP works differently because SoC vendor A configured it differently from
SoC vendor B.

-- 
balbi

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