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

[Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>]

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.