linux-kernel - Re: [PATCH v3] Bitbanging i2c bus driver using the GPIO API

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Message-ID: <20070419205942.GC5577@csclub.uwaterloo.ca>
Date:	Thu, 19 Apr 2007 16:59:42 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Haavard Skinnemoen <hskinnemoen@...el.com>,
	David Brownell <david-b@...bell.net>,
	Bryan Wu <bryan.wu@...log.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Deepak Saxena <dsaxena@...xity.net>,
	linux-kernel@...r.kernel.org,
	Christer Weinigel <wingel@...o-system.com>,
	Jordan Crouse <jordan.crouse@....com>
Subject: Re: [PATCH v3] Bitbanging i2c bus driver using the GPIO API

On Thu, Apr 19, 2007 at 08:54:13AM +0200, Jean Delvare wrote:
> The major difference is that the implementation in scx200_i2c is
> hardware-specific, while the i2c-gpio driver is a generic one, so it's
> a lot better.
> 
> What this means is that i2c-gpio obsoletes scx200_i2c, so I am inclined
> to delete scx200_i2c right away. I'm not even sure anyone still uses it
> now that scx200_acb has been fixed and is reported to work very well.
> If anyone really needs to do I2C over GPIO pins on SCx200, this should
> be reimplemented on top of i2c-gpio.

I use scx200_i2c.  The SBC I am using doesn't work with the scx200_acb
(different pins on the cpu after all).  I would love to see it
reimplemented using the generic interface, since there isn't that many
lines of code involved as far as I can tell.  Well scx200_acb works fine
on a Geode LX board, but not on a Geode SC1200 board.  Unless it has
been fixed since 2.6.18, then it still doesn't work, but scx200_i2c
works perfectly fine.

> It also looks to me like i2c-ixp2000 and i2c-ixp4xx are obsoleted by
> i2c-gpio. Deepak, can you please try using i2c-gpio instead and confirm
> that i2c-ixp2000 and i2c-ixp4xx can be deleted?

--
Len Sorensen
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