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

[Arnd Bergmann]

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@xxxxxxxx>
> > 
> > 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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