linux-kernel - Re: [PATCH] clk: Add PWM clock driver

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Date:	Mon, 03 Nov 2014 18:45:59 +0100
From:	Janusz Użycki <j.uzycki@...roma.com.pl>
To:	Mike Turquette <mturquette@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>
CC:	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pwm@...r.kernel.org
Subject: Re: [PATCH] clk: Add PWM clock driver


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 Użycki 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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