Re: [PATCH] clk: Add PWM clock driver

[Janusz UÅycki]

W dniu 2014-09-27 o 22:01, Mike Turquette pisze:
> Quoting Thierry Reding (2014-09-23 01:51:31)
> > On Wed, Sep 10, 2014 at 10:05:17PM +0200, Janusz UÅycki wrote:
> > > Hi,
> > >
> > > http://patchwork.ozlabs.org/patch/359069/
> > > https://lkml.org/lkml/2014/6/12/186
> > >
> > > Will the patch ever included to linux-next?
> > I've never seen this patch before. From a quick look it doesn't seem
> > like it would work as is, but the idea is certainly interesting. If
> > somebody decides to continue work on it, please Cc me and the linux-pwm
> > mailing list.
> I just merged a gpio-controlled clock gate and I'm fine with a PWM clock
> output.
>
> Janusz, how are you testing the clock driver?

Sorry, I didn't noticed the email.
I didn't test the patch yet. However I plan to check it this year.

best regards
Janusz

> Regards,
> Mike
>
> > > pwm_config()  API could be extended to support
> > > not only period [ns] and duty [ns] time
> > > but also frequency [Hz] and duty cycle fraction [1/1000?]
> > > (instead of time in ns) as parameters.
> > > Then  ns (rounded by pwm) to freq. conversion problem
> > > inclk_pwm_recalc_rate() usingpwm_get_period()
> > > could be avoided.
> > > To extend the API pwm_config() can support
> > > new flags forduty_ns and period_ns,
> > > eg. PWM_DUTY_PERCENT and PWM_PERIOD_HZ.
> > Is that rounding really a problem? Also the PWM chips will most likely
> > use the concept of period and duty-cycle internally anyway, so it will
> > convert back from Hz/percentage to nanoseconds and fall victim to
> > similar rounding effects.
> >
> > Thierry

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