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

[Guenter Roeck]

On 09/09/2013 09:13 PM, Stephen Warren wrote:
> 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.

I don't know. The regulator folks would have to answer that.

Guenter


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