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

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Message-ID: <20151020193528.GE32054@sirena.org.uk>
Date:	Tue, 20 Oct 2015 20:35:28 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Rob Herring <robh@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux PWM List <linux-pwm@...r.kernel.org>,
	Linux USB List <linux-usb@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [GIT PULL] On-demand device probing

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 
> 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.

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