linux-kernel - Re: [RESEND #2] [PATCH v2] LEDS: Add output invertion option to backlight trigger

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Message-Id: <20110106131659.cedf8500.akpm@linux-foundation.org>
Date:	Thu, 6 Jan 2011 13:16:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>,
	Richard Purdie <rpurdie@...ys.net>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [RESEND #2] [PATCH v2] LEDS: Add output invertion option to
 backlight trigger

On Thu, 6 Jan 2011 13:08:56 -0800
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Thu, 6 Jan 2011 13:04:40 -0800 Andrew Morton wrote:
> 
> > On Thu, 9 Dec 2010 14:41:50 +0100
> > Janusz Krzysztofik <jkrzyszt@....icnet.pl> wrote:
> > 
> > > +static DEVICE_ATTR(invert, 0644, bl_trig_invert_show, bl_trig_invert_store);
> > 
> > This new sysfs file should be documented.  Where would be an
> > appropriate place for that?  Documentation/leds-class.txt doesn't
> > mention a sysfs API at all.  
> > --
> 
> in Documentation/ABI/, where all sysfs interface info lives.
> 

Spose so.  Documentation/ABI/stable/sysfs-class-backlight does have
some stuff in it.

Personally I tend to regard Documentation/ABI/ as fairly useless
incomprehensible stuff, maintained to keep Greg happy ;) It'd be better
to have a nice little well-maintained document for a subsystem such as
this which actually explains its operation in a useful-to-humans way. 
Rather than just mechanically filling out forms.

But a Documentation/ABI update is a heck of a lot better than nothing.

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