linux-kernel - Re: [PATCH 2.6.29.2] PXA I2C: Define log level for i2c PXA error report

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Date:	Mon, 11 May 2009 21:29:53 +0800
From:	伊泽 <wxc200@...il.com>
To:	Mark Brown <broonie@...ena.org.uk>
Cc:	Michael Abbott <michael@...neidae.co.uk>,
	linux-i2c@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2.6.29.2] PXA I2C: Define log level for i2c PXA error 
	report

2009/5/11 Mark Brown <broonie@...ena.org.uk>:
> On Mon, May 11, 2009 at 11:31:51AM +0100, Michael Abbott wrote:
>
>> static struct i2c_pxa_platform_data xcep_i2c_platform_data  = {
>>         .class = I2C_CLASS_HWMON
>> };
>
>> ...
>>         pxa_set_i2c_info(&xcep_i2c_platform_data);
>
>> This is called in the .init_machine method, and the target system is a
>> PXA255.
>
>> However, after the error messages on startup, all the sensors seem to be
>> detected and seem to be operating normally.
>
> These errors occur when attempting to talk to non-existant devices which
> is almost certainly going to happen with the class based device probing
> since the kernel will probe for each device at each possible address on
> each I2C bus.
>
that happen when the device driver registered but the hardware doesnot
exist.i once met this
when my camera driver could not find the hardware camera.

thanks
--wxc200
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