Locking in the clk API

[Russell King - ARM Linux]

On Thu, Jan 20, 2011 at 11:16:04PM -0800, Saravana Kannan wrote:
> This suggestion looked promising till I realized that clk_set_rate()  
> will still be atomic. clk_set_rate() will need to enable/disable the  
> PLLs depending on which PLLs the rates are derived from. So, the locking  
> in clk_prepare/unprepare() still has to be atomic since the "slow stuff"  
> is shared with clk_set_rate().

Who calls clk_set_rate() from an atomic context?  Do we know whether
anyone does?