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

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Date:	Sun, 24 Feb 2013 19:58:06 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Lars Poeschel <larsi@....tu-dresden.de>
Cc:	poeschel@...onage.de, thierry.reding@...onic-design.de,
	rob@...dley.net, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC] pwm: add sysfs interface

On Tue, Feb 19, 2013 at 03:27:41PM +0100, Lars Poeschel wrote:
> From: Lars Poeschel <poeschel@...onage.de>
> 
> This adds a simple sysfs interface to the pwm subsystem. It is
> heavily inspired by the gpio sysfs interface.
> 
>         /sys/class/pwm
>                 /export ... asks the kernel to export a PWM to userspace
>                 /unexport ... to return a PWM to the kernel
>             /pwmN ... for each exported PWM #N
>             /duty_ns ... r/w, length of duty portion
>             /period_ns ... r/w, length of the pwm period
>             /polarity ... r/w, normal(0) or inverse(1) polarity
>                                only created if driver supports it
>             /run ... r/w, write 1 to start and 0 to stop the pwm
>         /pwmchipN ... for each pwmchip; #N is its first PWM
>             /base ... (r/o) same as N
>             /ngpio ... (r/o) number of PWM; numbered N .. MAX_PWMS

You have to document this all in the Documentation/ABI/ directory for
sysfs files. Please do that in your next version of this patch.

thanks,

greg k-h
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