linux-kernel - Re: Controlling Driver Load Order

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Message-ID: <4BFEDF6D.3090100@bluewatersys.com>
Date:	Fri, 28 May 2010 09:09:01 +1200
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Robert Emanuele <rob@...nuele.us>
CC:	Wolfram Sang <w.sang@...gutronix.de>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-i2c@...r.kernel.org
Subject: Re: Controlling Driver Load Order

Robert Emanuele wrote:
> Hi Wolfram,
> 
> I am using the i2c-gpio.c driver, not the i2c-at91 driver.  The Atmel
> folks have expressed concerns over their i2c silicon and wrote a gpio
> version.
> 
> Anyway, I better understand the subsys_initcall now and applied that
> to the i2c-gpio and my i2c chip driver.  That worked perfectly for my
> issue.  I'd be happy to return a patch of this.  Would be this the
> sort of thing that would benefit from a config option?  Something
> like:
> 
> #if defined(CONFIG_EARLY_i2C_GPIO)
> subsys_initcall(i2c_gpio_init);
> #else
> module_init(i2c_gpio_init);
> #endif

Looks like this has already been done:
http://www.mail-archive.com/linux-i2c@vger.kernel.org/msg03056.html

There was a discussion a while back to make all of the embedded i2c
busses be subsys_initcall since i2c is often a system bus on embedded
devices. Looks the i2c_gpio driver got missed the first time round.

~Ryan

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