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

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Date:	Sun, 6 Feb 2011 14:22:09 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	arden jay <arden.jay@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Hemanth V <hemanthv@...com>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Eric Miao <eric.miao@...aro.org>, linux-kernel@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Jean Delvare <khali@...ux-fr.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC] add pwmlib support

2011/1/31 Sascha Hauer <s.hauer@...gutronix.de>:
> 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.

Low-frequency PWM is used for vibrators of the type found in
silent mode cellphones, to mention another use case.

Yours,
Linus Walleij
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