[RFC PATCH 05/15] pwm: introduce default period and polarity concepts

Boris Brezillon boris.brezillon at free-electrons.com
Thu Jul 2 00:49:55 PDT 2015

On Thu, 2 Jul 2015 08:44:45 +0200
Uwe Kleine-König <u.kleine-koenig at pengutronix.de> wrote:

> On Wed, Jul 01, 2015 at 10:21:51AM +0200, Boris Brezillon wrote:
> > When requested by a user, the PWM is assigned a default period and polarity
> > extracted from the DT, the platform data or statically set by the driver.
> > Those default values are currently stored in the period and polarity
> > fields of the pwm_device struct, but they will be stored somewhere else
> > once we have introduced the architecture allowing for hardware state
> > retrieval.
> > 
> > The pwm_set_default_polarity and pwm_set_default_period should only be
> > used by PWM drivers or the PWM core infrastructure to specify the
> > default period and polarity values.
> Would it make sense to put the prototypes of
> pwm_set_default_p{olarity,eriod} into (say) drivers/pwm/pwm-private.h
> then?

Yes, definitely. I was thinking about moving those functions/prototypes
into include/linux/pwm-provider.h, but I'm fine with
drivers/pwm/pwm-private.h too.

Thierry, any opinion ?

Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering

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