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

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Message-ID: <20151026011224.GV29919@sirena.org.uk>
Date:	Mon, 26 Oct 2015 10:12:24 +0900
From:	Mark Brown <broonie@...nel.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Rob Herring <robh+dt@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Subject: Re: [GIT PULL] On-demand device probing

On Sun, Oct 25, 2015 at 02:54:39PM +0100, Rafael J. Wysocki wrote:
> On Sun, Oct 25, 2015 at 12:06 AM, Mark Brown <broonie@...nel.org> wrote:

> > There's also the understanding people had that the order things get
> > bound changes the ordering for some of the other cases (perhaps it's a
> > good idea to do that, it seems likely to be sensible?).

> But it really doesn't do that.  Also making it do so doesn't help much
> in the cases where things can happen asynchronously (system
> suspend/resume, runtime PM).

Yeah, people seem to have that impression though. :(

> If, instead, there was a way to specify a functional dependency at the
> device registration time, it might be used to change the order of
> everything relevant, including probe.  That should help to reduce the
> noise you're referring to.

This links back to the idea of having generic support for pre-probe
actions which is also generally useful (the ability to do things like
power on regulators for devices on enumerable buses so they can be
enumerated as standard).  

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