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+TODO:
+ - support for fractional multiplier
+ - support for fractional divider (output 0 only)
+ - support for set_rate() operations (may benefit from Stephen Boyd's
+ refactoring of the clk primitives: https://lkml.org/lkml/2014/9/5/766)
+ - review arithmetic
+ - overflow after multiplication?
+ - maximize accuracy before divisions
+
+Patches to:
+ Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+ Sören Brinkmann <soren.brinkmann@xilinx.com>