linux-kernel - Re: [PATCH v3 1/2] hwmon: (lm90) Add power control

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Message-ID: <522E9C84.9070405@wwwdotorg.org>
Date:	Mon, 09 Sep 2013 22:13:56 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Wei Ni <wni@...dia.com>, Mark Brown <broonie@...nel.org>,
	"khali@...ux-fr.org" <khali@...ux-fr.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] hwmon: (lm90) Add power control

On 09/09/2013 09:53 PM, Guenter Roeck wrote:
> On 09/09/2013 08:40 PM, Stephen Warren wrote:
>> On 09/09/2013 09:36 PM, Guenter Roeck wrote:
...
>>> My understanding is that by adding regulator support you essentially
>>> committed to adding regulators (if necessary dummy ones) for this driver
>>> to all those platforms. This is quite similar to other drivers in the
>>> same situation. Once you start along that route, you'll have to go it
>>> all the way.
>>
>> By using regulator_get_optional(), the regulator should be optional,
>> hence you only have to add it to platforms that need it.
>>
> 
> Earlier comments suggest that this is not the intended use case for
> regulator_get_optional().

Isn't the issue only whether the optional aspect of the regulator is
implemented by:

a) regulator_get_optional() returning failure, then the driver having to
check for that and either using or not-using the regulator.

b) regulator_get_optional() returning a dummy regulator automatically
when none is specified in DT or the regulator lookup table, and hence
the driver can always call regulator_enable/disable on the returned value.
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