Re: [PATCH v5 05/46] pwm: introduce the pwm_args concept

[Boris Brezillon]

On Tue, 12 Apr 2016 13:39:12 +0200
Thierry Reding <thierry.reding@xxxxxxxxx> wrote:

> On Wed, Mar 30, 2016 at 10:03:28PM +0200, Boris Brezillon wrote:
> > Currently the PWM core mixes the current PWM state with the per-platform
> > reference config (specified through the PWM lookup table, DT definition or
> > directly hardcoded in PWM drivers).
> > 
> > Create a pwm_args struct to store this reference config, so that PWM users
> > can differentiate the current config from the reference one.
> > 
> > Patch all places where pwm->args should be initialized. We keep the
> > pwm_set_polarity/period() calls until all PWM users are patched to
> > use pwm_args instead of pwm_get_period/polarity().
> 
> Perhaps a helper would be useful? Something like:
> 
> 	static inline void
> 	pwm_apply_args(struct pwm_device *pwm, const struct pwm_args *args)
> 	{
> 		pwm_set_duty_cycle(pwm, args->duty_cycle);
> 		pwm_set_period(pwm, args->period);
> 	}
> 
> ? That would make it slightly easier to get rid of it again after all
> clients have been converted.

Sure. I'll add this helper.

> 
> With the exception of pwm-clps711x all of these args are set at of_xlate
> time (for DT) or from the lookup table in pwm_get() (for non-DT), so it
> might even be possible to move this call to the core, so that removal of
> it will be a one-liner.

Not sure I get that one. Some drivers are implementing their own
->of_xlate() method, how would you get rid of this pwm_apply_args() in
those custom implementations?

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com