linux-kernel - Re: [PATCH v2 2/2] regulator: add device tree support for max8997

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Date:	Fri, 27 Jan 2012 10:58:08 +0100
From:	Karol Lewandowski <k.lewandowsk@...sung.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Thomas Abraham <thomas.abraham@...aro.org>,
	linux-kernel@...r.kernel.org, rpurdie@...ys.net,
	rob.herring@...xeda.com, grant.likely@...retlab.ca,
	kgene.kim@...sung.com, myungjoo.ham@...sung.com,
	kyungmin.park@...sung.com, dg77.kim@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, Rajendra Nayak <rnayak@...com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>
Subject: Re: [PATCH v2 2/2] regulator: add device tree support for max8997

>> On 25.01.2012 12:22, Mark Brown wrote:
>>> The big problem there seems like specifying voltages in the first
>>> place, if we know what device it is we should already know what's
>>> going on.
>
>> Driver which handles said regulator might know what's going on, but
>> that might not be case for its consumers.  Should we limit ability to
>> query given parameter just because its value is hardcoded in hardware?
>
> I'm sorry, this makes no sense.  Setting a value in the constraints is
> not going to have any impact on the value reported by the driver, it
> never has.

... with the exception of fixed regulator, that is. This is from where I 
got my flawed understanding.

Looking at other drivers I see that's indeed special case not practiced 
elsewhere.

Thanks for explaining this.

Regards,
-- 
Karol Lewandowski | Samsung Poland R&D Center | Linux/Platform
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