clk_disable — inform the system when the clock source is no longer required.
| void clk_disable ( | struct clk * clk ); | 
Inform the system that a clock source is no longer required by a driver and may be shut down.
May be called from atomic contexts.
   if the clock source is shared between
   multiple drivers, clk_enable calls must be balanced by the
   same number of clk_disable calls for the clock source to be
   disabled.