linux-kernel - Re: [PATCH 1/6] i2c: bcm-kona: register with subsys

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Date:	Wed, 5 Feb 2014 11:19:28 -0500
From:	Matt Porter <mporter@...aro.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Tim Kryger <tim.kryger@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Christian Daudt <bcm@...thebug.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linux I2C List <linux-i2c@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/6] i2c: bcm-kona: register with subsys_initcall

On Wed, Feb 05, 2014 at 10:30:29AM -0500, Alan Stern wrote:
> On Wed, 5 Feb 2014, Matt Porter wrote:
> 
> > On Wed, Feb 05, 2014 at 10:08:18AM +0100, Wolfram Sang wrote:
> > > On Tue, Feb 04, 2014 at 07:19:07AM -0500, Matt Porter wrote:
> > > 
> > > > Voltage regulators are needed very early due to deferred probe
> > > > being incompatible with built-in USB gadget drivers.
> > > 
> > > What does it need to fix those instead?
> > 
> > [added Alan/Felipe for more insight]
> > 
> > Discussion on that topic came about from this submission:
> > http://www.spinics.net/lists/linux-usb/msg94217.html
> > 
> > End of it is:
> > http://www.spinics.net/lists/linux-usb/msg94731.html
> > 
> > We can either add to the many drivers that already do subsys_initcall()
> > for similar reasons...or I can drop this from the series and add gadget
> > probe ordering to my TODO list.
> > 
> > In short, it can't be a late_initcall() hack like the original post and
> > really could be solved by converting to a real bus (and letting
> > deferred probe do its job)..but Alan voiced concerns about that.
> 
> Don't worry too much about what I said.  If adding a "gadget" bus will 
> solve the problem in an appropriate way, and if nobody else objects 
> (particularly Felipe, who is on vacation now), then go for it.

Ok, I'll take a look at what can be done and restart the conversation
when Felipe returns.

Wolfram: given this, as I mentioned, I'll simply drop this patch from
the series and work around it for now. This will probably make Lee and
Mark happy to not see subsys_initcall() in the MFD/regulator drivers as
well.

-Matt
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