linux-kernel - Re: [PATCH v1] pwm: add sysfs interface

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Message-ID: <20130408113457.GA17028@avionic-0098.mockup.avionic-design.de>
Date:	Mon, 8 Apr 2013 13:34:58 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Lars Poeschel <poeschel@...onage.de>
Cc:	Lars Poeschel <larsi@....tu-dresden.de>, rob@...dley.net,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v1] pwm: add sysfs interface

On Mon, Apr 08, 2013 at 01:15:37PM +0200, Lars Poeschel wrote:
[...]
> You mean change only while a PWM is disabled ?Ok, as said above, I need to be 
> able to change at least the duty cycle while the PWM is running without 
> having gaps. But prohibiting changes of the period could be done with 
> returning -EBUSY.

Okay, that sounds acceptable. duty-cycle should be the only value that
can be changed while a PWM is enabled. Obviously it should still return
-EINVAL if the duty-cycle is larger than the period, but the PWM core
will take care of that automatically.

By the way, would you mind elaborating a bit on the various use-cases
that you have? I'm interested in what people use the PWM subsystem for
and you seem to be the only one currently using it from userspace. I'm
hoping I can get a better understanding of what the PWM subsystem nedes
to provide if I know what people use it for.

Thierry

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