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:
6 https://lore.kernel.org/lkml/1409957256-23729-1-git-send-email-sboyd@codeaurora.org)
8 - overflow after multiplication?
9 - maximize accuracy before divisions
12 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
13 Sören Brinkmann <soren.brinkmann@xilinx.com>