linux-kernel - i2c-eg20t: regression since i2c_add_numbered

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Date:	Wed, 22 Aug 2012 08:30:35 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	linux-i2c@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"Jean Delvare (PC drivers, core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Feng Tang <feng.tang@...el.com>,
	Tomoya MORINAGA <tomoya.rohm@...il.com>
Subject: i2c-eg20t: regression since i2c_add_numbered_adapter change

Hello,

I just noticed the 3.4 linux kernel fails to sucessfully probe the i2c-eg20t 
driver. I returns with EBUSY error. It worked on the 3.0 kernel. To my view it 
is caused the commit 07e8a51ff68353e01d795cceafbac9f54c49132b ( i2c-eg20t: use 
i2c_add_numbered_adapter to get a fixed bus number).
The reason it actually fails is that the i2c-isch driver is registered 
beforehand which gets bus number 0. But this one is the bus number the eg20t 
driver wants to register.
A possibility is that if i2c_add_numbered_adapter failed with EBUSY just use 
i2c_add_adapter to get at least the driver working, but with a non-fixed bus 
number. Opinions?

Best regards,
Alexander

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