linux-kernel - Re: [patch 2.6.20-rc2] gpio_direction

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Message-ID: <20070302102617.2fb8e0dc@dhcp-252-105.norway.atmel.com>
Date:	Fri, 2 Mar 2007 10:26:17 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Victor <andrew@...people.com>,
	Milan Svoboda <msvoboda@...rockwell.com>
Subject: Re: [patch 2.6.20-rc2] gpio_direction_output() needs an initial
 value

On Thu, 1 Mar 2007 18:25:09 -0800
David Brownell <david-b@...bell.net> wrote:

> It's been pointed out that output GPIOs should have an initial value, to
> avoid signal glitching ... among other things, it can be some time before
> a driver is ready.  This patch corrects that oversight, fixing
> 
>  - documentation
>  - platforms supporting the GPIO interface
>  - users of that call (just one for now, others are pending)
> 
> Note that most platforms are clear about the hardware letting the output
> value be set before the pin direction is changed, but the s3c241x docs
> are vague on that topic ... so those chips might not avoid the glitches.
> 
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

Acked-by: Haavard Skinnemoen <hskinnemoen@...el.com>

Thanks, Dave.

Haavard
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