linux-kernel - Re: [PATCH v5 2/4] pwm_backlight: use power sequences

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Message-ID: <1584217.aCLniK0dpS@percival>
Date:	Fri, 7 Sep 2012 17:34:34 +0900
From:	Alex Courbot <acourbot@...dia.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v5 2/4] pwm_backlight: use power sequences

On Friday 07 September 2012 16:29:03 Mark Brown wrote:
> On Fri, Sep 07, 2012 at 05:28:17PM +0900, Alex Courbot wrote:
> > We could make power sequences an option of its own and add #ifdefs to
> > drivers that use it to lift this ambiguity, but I like the transparency
> > of the current way. It also seems hard (illegal?) to get rid of the
> > legacy DT interface.
> If you're doing this I'd suggest using stubs rather than ifdefs in the
> users, otherwise it's just going to cause lots of annoyance from
> randconfig build.  Is the code likely to big enough to worry about,
> though?

I don't think is will ever become big enough to bother. Moreover if the power 
seqs way meets acceptance, new drivers/frameworks are likely to use them as 
the only option, making it really mandatory.

Alex.

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