linux-kernel - Re: [PATCH 03/13] video: clarify I2C dependencies

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Message-ID: <12886728.o7TzRXlxjF@wuerfel>
Date:	Thu, 24 Apr 2014 14:48:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Peter Griffin <peter.griffin@...aro.org>,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, Anatolij Gustschin <agust@...x.de>
Subject: Re: [PATCH 03/13] video: clarify I2C dependencies

On Thursday 24 April 2014 13:32:35 Russell King - ARM Linux wrote:
> On Thu, Apr 24, 2014 at 01:28:19PM +0100, Peter Griffin wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > We can only use I2C support in frame buffer drivers if
> > Either I2C is built-in, or both I2C and the driver itself
> > are loadable modules.
> 
> Why?


If I2C is a loadable module, and the I2C support of the framebuffer
driver is built-in, you get a link error when building vmlinux:

drivers/built-in.o: In function `cyberpro_pci_remove':
:(.text+0x1ea5c): undefined reference to `i2c_del_adapter'
drivers/built-in.o: In function `cyberpro_pci_probe':
:(.text+0x20224): undefined reference to `i2c_bit_add_bus'
:(.text+0x20240): undefined reference to `i2c_del_adapter'
make[2]: *** [vmlinux] Error 1

It's probably a good idea to mention that in the changeset
text.

	Arnd
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