[PATCH v3 3/5] clk: introduce the common clock framework

[Russell King - ARM Linux]

On Thu, Dec 01, 2011 at 11:30:16AM -0700, Paul Walmsley wrote:
> The intention behind the clk_{allow,block}_rate_change() proposal was to 
> allow the current user of the clock to change its rate without having to 
> call clk_{allow,block}_rate_change(), if that driver was the sole user of 
> the clock.

And how does a driver know that?