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

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Message-ID: <20151018194124.GA14956@sirena.org.uk>
Date:	Sun, 18 Oct 2015 20:41:24 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	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>,
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Subject: Re: [GIT PULL] On-demand device probing

On Sat, Oct 17, 2015 at 08:47:09AM -0700, Greg Kroah-Hartman wrote:
> On Sat, Oct 17, 2015 at 10:04:55AM -0500, Rob Herring wrote:

> > I think Linus W, Mark B, and I all said a similar thing initially in
> > that dependencies should be handled in the driver core. We went down
> > the path of making this not firmware (aka bus) specific and an earlier
> > version had just that (with fwnode_* calls). That turned out to be
> > pointless as the calling locations were almost always in DT specific
> > code anyway. If you notice, the calls are next to other DT specific
> > calls generally (usually a "get"). So yes, I'd prefer not to have to
> > touch every subsystem, but we had to do that anyway to add DT support.

> If they are "next" to a call like that, why not put it in that call?  I
> really object to having to "sprinkle" this all over the kernel, for no
> obvious reason why that is happening at all (look at the USB patch for
> one such example.)

I did ask that question myself IIRC - we could probably get a long way
by trying to instantiate anything that looks probable when we do a
phandle lookup on it.

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