I2C/PMBus to LTM4677 on Arria10 SoC Dev Board?

Has anyone ever tried talking to the LTM4677 chip on the Arria10 SoC Dev Kit Board? I’ve been successful in getting info out of the MAZ1619 via i2c-tools, but the LTM does not respond to i2c-tools commands. My assumption is that it requires PMBus API commands to be called. I can’t seem to find a convenient PMBus library recipe to build into my image.
If anyone has done this, and can share some tricks, it would be appreciated. Otherwise, if someone can point me to a recipe for PMBus API that can be built into Angstrom, that would also be appreciated.