The B112 is a compact HDMI 2.0 to CSI-2 bridge (4 CSI-2 lanes @ up to 2 GHz). It features a HDMI 2.0 input (600 MHz and 6 Gbit/s) for 4kp30 @ 10 bit color (4:2:2) and 4kp60 at 8 bit color (4:2:0). It is based on the Lontium LT6911UXC. It has the same physical size as the B102 (27 x 42 mm) but supports HDMI 2.0 and 4k modes.
Driver is now available for download on Github. It will be shipped out untested.