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

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Message-ID: <20120802181111.GM4537@opensource.wolfsonmicro.com>
Date:	Thu, 2 Aug 2012 19:11:12 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
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 Thu, Aug 02, 2012 at 10:21:57AM +0200, Thierry Reding wrote:
> On Thu, Aug 02, 2012 at 05:00:13PM +0900, Alex Courbot wrote:

> > The problem is, how do we turn these phandles into the resource of
> > interest. The type of the resource can be infered by the name of the
> > property. The hard part is resolving the resource from the phandle -
> > it seems like the API just does not allow to do this. GPIO has
> > of_get_named_gpio, but AFAIK there are no equivalent for regulator
> > consumer and PWM: the only way to use the DT with them is through
> > get_regulator and get_pwm which work at the device level.

> > Or is there a way that I overlooked?

> No, you are right. Perhaps we should add exported functions that do the
> equivalent of of_pwm_request() or the regulator_dev_lookup() and
> of_get_regulator() pair.

I missed some of the earlier bits of the thread here but why can't we do
device based lookups?
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