linux-kernel - Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

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Message-ID: <20120801074113.GF29673@avionic-0098.adnet.avionic-design.de>
Date:	Wed, 1 Aug 2012 09:41:13 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Alex Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Stephen Warren <swarren@...dia.com>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences

On Tue, Jul 31, 2012 at 04:39:41PM +0100, Mark Brown wrote:
> On Tue, Jul 31, 2012 at 04:32:35PM +0200, Thierry Reding wrote:
> > On Tue, Jul 31, 2012 at 03:26:07PM +0100, Mark Brown wrote:
> 
> > > This is framework code - it doesn't have much option.  Disabling HOTPLUG
> > > is totally reasonable on space constrained systems, there's no reason
> > > for the code to break things for people.
> 
> > Still if you use this code and disable HOTPLUG, then you shouldn't be
> > using modules either. I mean there is no way you can write a driver that
> 
> Of course.
> 
> > can gracefully handle its platform data being discarded.
> 
> Sure there is - take a copy of the platform data in probe().

Yes, but that will only work for built-in drivers. If you unload the
module and that causes the platform data to be discarded, reloading
won't work.

Thierry

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