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