linux-kernel - Re: [i2c] [PATCH take2] [POWERPC] i2c: adds support for i2c bus on 8xx

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Message-ID: <20071017230027.334a5f48@hyperion.delvare>
Date:	Wed, 17 Oct 2007 23:00:27 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Jochen Friedrich <jochen@...am.de>
Cc:	Scott Wood <scottwood@...escale.com>,
	Carsten Juttner <carjay@....net>, linux-kernel@...r.kernel.org,
	i2c@...sensors.org, linuxppc-embedded@...abs.org
Subject: Re: [i2c] [PATCH take2] [POWERPC] i2c: adds support for i2c bus on
  8xx

On Wed, 17 Oct 2007 21:20:37 +0200, Jochen Friedrich wrote:
> >> +	/* Select an arbitrary address.  Just make sure it is unique.
> >> +	 */
> >> +	out_8(&i2c->i2c_i2add, 0xfe);
> >>     
> >
> > It's a 7-bit address...  and are you sure that 0x7e is unique?  Does this
> > driver even support slave operation?
> >   
> 
> It's in fact 0x7F << 1. The same value is used in the 2.4 driver and
> in u-boot, as well. Slave operation is not supported.

I'm not sure what exactly you are doing here, but 0x7f isn't a valid
7-bit I2C address.

-- 
Jean Delvare
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