linux-kernel - Re: [RFC] add pwmlib support

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Date:	Mon, 31 Jan 2011 08:58:03 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	arden jay <arden.jay@...il.com>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	Jean Delvare <khali@...ux-fr.org>,
	linux-kernel@...r.kernel.org, Eric Miao <eric.miao@...aro.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Hemanth V <hemanthv@...com>,
	linux-arm-kernel@...ts.infradead.org,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [RFC] add pwmlib support

On Sun, Jan 30, 2011 at 11:49:32AM +0800, arden jay wrote:
> Sorry, I'm confused about this.
> If it is for backlight control, why it don't go through led_class?

PWMs are not limited to backlight. As Jean pointed out they can be used
for fans (or more generally motors) aswell. Have a look at
drivers/leds/leds-pwm.c, it is a user of this pwm API.

Sascha

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