linux-kernel - Re: [GIT PULL] On-demand device probing

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Date:	Wed, 21 Oct 2015 01:35:38 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mark Brown <broonie@...nel.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Rob Herring <robh@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <linux@....linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Terje Bergström <tbergstrom@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Felipe Balbi <balbi@...com>, Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-clk@...r.kernel.org, dmaengine@...r.kernel.org,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
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	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
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	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [GIT PULL] On-demand device probing

On Tuesday, October 20, 2015 08:35:28 PM Mark Brown wrote:
> 
> --7fVr/IRGAG9sAW4J
> Content-Type: text/plain; charset=us-ascii
> Content-Disposition: inline
> Content-Transfer-Encoding: quoted-printable
> 
> On Tue, Oct 20, 2015 at 01:14:46PM -0400, Alan Stern wrote:
> > On Tue, 20 Oct 2015, Tomeu Vizoso wrote:
> 
> > > This iteration of the series would make this quite easy, as
> > > dependencies are calculated before probes are attempted:
> 
> > > https://lkml.org/lkml/2015/6/17/311
> 
> > But what Rafael is proposing is quite general; it would apply to _all_
> > dependencies as opposed to just those present in DT drivers or those=20
> > affecting platform_devices.
> 
> We'll still need most of the DT bits that are there at the minute (the
> ones strewn around the subsystems) AFAICT since it's at the point where
> we parse the DT and work out what the dependencies are which we probably
> want to do prior to getting the drivers up and will be different for
> ACPI.  I think the level of DT dependency here looks a lot larger than
> it actually is due to the fact that a lot of what's being modified is DT
> parsing code.

Right, something will have to register the dependency, or a "link" between
devices, with the core once we find out that the dependency is there.

Thanks,
Rafael

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