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Date: Sun, 24 Mar 2013 08:44:58 +0200
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Corey Richardson <corey@octayn.net>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Mike Turquette <mturquette@linaro.org>, linux-kernel@vger.kernel.org
Subject: Re: clk: x86: build failure
Message-ID: <20130324064458.GF21804@intel.com>
References: <CA++BO6Qz90ZY4udNYYPJLMhUi1Q3kwrW16G6j_-tf_bfPfqU5A@mail.gmail.com>
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On Sat, Mar 23, 2013 at 01:57:01PM -0400, Corey Richardson wrote:
> With the attached config, I get the following build failure:
> 
>   LD      init/built-in.o
> drivers/built-in.o:clk-lpt.c:function v4l2_device_unregister: error:
> undefined reference to 'i2c_unregister_device'

I get following with your config:

LD      init/built-in.o
drivers/built-in.o: In function `v4l2_device_unregister':
(.text+0x1186cb): undefined reference to `i2c_unregister_device'
make: *** [vmlinux] Error 1

and it looks like it wants to build in videodev.o (which provides
v4l2_device_unregister()):

CONFIG_VIDEO_DEV=y

This function calls i2c_unregister_device() if IS_ENABLED(CONFIG_I2C) but
i2c support is compiled as a module:

CONFIG_I2C=m

which explains the link error.

However, this has nothing to do with clk-lpt.c or anything related to clock
framework as far as I can tell.