linux-kernel - Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

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Message-ID: <20130809105644.GW6427@sirena.org.uk>
Date:	Fri, 9 Aug 2013 11:56:44 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Wei Ni <wni@...dia.com>
Cc:	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	Matthew Longnecker <MLongnecker@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control

On Fri, Aug 09, 2013 at 03:23:31PM +0800, Wei Ni wrote:
> On 08/08/2013 07:01 PM, Mark Brown wrote:

> > You shouldn't just be ignoring errors here, though there are deployment
> > difficulties with making sure a stub regulator is provided.  These
> > should be getting easier after the next merge window, the stubs will be
> > being tweaked slightly to have an "assume it's there" option even when

> Oh, really, could you show me the patch, I wish to take a look :)

No patch quite yet - the basic idea is that for plain regulator_get()
you'll only ever get -EPROBE_DEFER as an error, not -ENODEV.  If the
regulator is missing in the DT we assume it's there and provide a dummy
if the DT doesn't hook it up.  If the consumer genuinely wants to see if
a supply might not be wired up it should use regulator_get_optional()
which is in -next at the minute.

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