linux-kernel - Re: [RFC][PATCH 2/5] driver core: Functional dependencies tracking support

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Message-ID: <20160608222402.GQ7510@sirena.org.uk>
Date:	Wed, 8 Jun 2016 23:24:02 +0100
From:	Mark Brown <broonie@...nel.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Thierry Reding <treding@...dia.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Michael Turquette <mturquette@...libre.com>
Subject: Re: [RFC][PATCH 2/5] driver core: Functional dependencies tracking
 support

On Wed, Jun 08, 2016 at 10:48:23PM +0200, Rafael J. Wysocki wrote:
> On Wed, Jun 8, 2016 at 8:35 PM, Mark Brown <broonie@...nel.org> wrote:

> > A parent (especially a MFD) may create a child to fulfil a role that
> > could also be filled by a non-parent device, if that happens then
> > depending on what ends up creating these links (it's not 100% clear from
> > this series) it's likely that the link creation will also end up
> > registering a dependency unless we do something special.  Now I think
> > about it this does depend on how we create the children though, it's
> > less likely to be an issue if the dependencies are created by firmware
> > code.

> If that's a non-child device, I would expect it to exist beforehand

No, it's an actual child.

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