From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [PATCH 3/3] i2c: change the id to let the i2c-gpio work
Date: Thu, 11 Oct 2012 16:11:44 +0900
Message-ID: <20121011071140.GA11726@opensource.wolfsonmicro.com>
References: <1349923097-14115-1-git-send-email-voice.shen@atmel.com>
 <1349923097-14115-4-git-send-email-voice.shen@atmel.com>
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To: Bo Shen <voice.shen@atmel.com>
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On Thu, Oct 11, 2012 at 10:38:17AM +0800, Bo Shen wrote:

>  static struct platform_device at91sam9260_twi_device = {
>  	.name			= "i2c-gpio",
> -	.id			= -1,
> +	.id			= 0,
>  	.dev.platform_data	= &pdata,
>  };

Why would this have any effect on the operation of the i2c-gpio driver?
This suggests i2c-gpio is buggy.