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

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Date:	Wed, 5 Feb 2014 10:30:29 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matt Porter <mporter@...aro.org>
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, 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.

Alan Stern

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