linux-kernel - Re: [PATCH] regulator: Set apply_uV only when min and max voltages are defined

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Message-id: <4F1FDA70.1090800@samsung.com>
Date:	Wed, 25 Jan 2012 11:33:20 +0100
From:	Karol Lewandowski <k.lewandowsk@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Karol Lewandowski <k.lewandowsk@...sung.com>,
	broonie@...nsource.wolfsonmicro.com, m.szyprowski@...sung.com,
	s.nawrocki@...sung.com, lrg@...com,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Rajendra Nayak <rnayak@...com>
Subject: Re: [PATCH] regulator: Set apply_uV only when min and max voltages are
 defined

Cc added, link to original posting: https://lkml.org/lkml/2012/1/25/62

On 25.01.2012 11:15, Karol Lewandowski wrote:
> On 25.01.2012 10:31, Karol Lewandowski wrote:
>> apply_uV is errornously set when regulator is instantiated from device
>> tree, even when it doesn't contain any voltage constraints.
> ...
>> - if (constraints->min_uV == constraints->max_uV)
>> + if (min_uV&& max_uV&& constraints->min_uV == constraints->max_uV)
>> constraints->apply_uV = true;
>
> While this fixes obvious error I doubt that apply_uV should be set based
> on min max equality. It have required fix to fixed regulator[1]
> as well for max8997[2]. It'll probably require fixes in other places too.
>
> Wouldn't it be better to explicitly use property like
> "regulator-voltage-apply" in DT to set apply_uV?
>
> if (min_uV && max_uV && constraints->min_uV == constraints->max_uV
> && of_find_property "regulator-voltage-apply")
> constraints->apply_uV = true;
>
> This would be consistent with handling of this flag from platform data.
>
> [1] http://permalink.gmane.org/gmane.linux.kernel/1234969
> [2] http://permalink.gmane.org/gmane.linux.kernel/1243714
>
> Regards,


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