Quoting Chao Xie (2014-08-25 21:38:14)

From: Chao Xie <redacted>

The register used by clk-frac may be shared with
other clocks.
So it needs to use spin lock to protect the register
access.

Signed-off-by: Chao Xie <redacted>

This patch will break against the latest clk-next due to api changes.
You can see more here[0] and use this script to update your code if you
like[1].

Basically the calls to clk_set_rate need to be changed to
clk_provider_set_rate.

[0] http://lkml.kernel.org/r/[ref]
[1] http://cgit.collabora.com/git/user/tomeu/linux.git/commit/?h=clk-refactoring-9&id=ea48c0d655346cce26329523cf24574f9ea8feee

Regards,
Mike