Has anyone here used a DDR PHY that exposes a DFI (https://ddr-phy.org/) interface and if you have do you have do you have any opinions on either the specification as a whole, or any features it's missing/misfeatures it has

https://git.sr.ht/~ld-cd/paste/blob/main/specs/DDR_PHY_Interface_Specification_v5_2.pdf

DFI - ddr-phy.org

DFI is an industry spec that simplifies and defines a standard interface between the DDR memory controller logic and the PHY interface.

Same goes if you've implemented such a phy