Multiple people asked camera related questions during my talk as FOSDEM (and after it). I did some basic reverse engineering, so let me share what I know.
The Droid 4 works with a OMAP4430, which has a imaging subsystem (ISS). It is documented quite well in the datasheet and there is a Linux kernel driver available in staging (omap4iss), which was written by Laurent Pinchart (thanks!). This module provides two MIPI CSI-2 interfaces to connect camera sensors.
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