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How can I change the pluto to support 2r2x

Hi all. I recently have a hard work that is to change Pluto to support 2r2x. I find that Pluto uses the AD9631 FPGA  core which supports 2r2x,and the pluto hardware schema already has 2r2x ability ,but Pluto just use 1r1x, so from the hardware point of view, Pluto supports 2r2x.  I think the main work is to port the iio linux  source codes to support 2r2x,but the linux or no OS iio source codes are so many ,Who can give me some advises to change which one?Thanks.