Date: Mon, 8 Apr 2013 13:34:58 +0200
From: Thierry Reding <thierry.reding@avionic-design.de>
To: Lars Poeschel <poeschel@lemonage.de>
Cc: Lars Poeschel <larsi@wh2.tu-dresden.de>, rob@landley.net,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v1] pwm: add sysfs interface
Message-ID: <20130408113457.GA17028@avionic-0098.mockup.avionic-design.de>
References: <1364997536-9246-1-git-send-email-larsi@wh2.tu-dresden.de>
 <20130408081745.GA21392@avionic-0098.mockup.avionic-design.de>
 <201304081315.37794.poeschel@lemonage.de>
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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 t=
o be=20
> able to change at least the duty cycle while the PWM is running without=
=20
> having gaps. But prohibiting changes of the period could be done with=20
> 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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