Whole of ISP uses v4l2. You communicate with ISP by sending specially formatted buffers (C structs docs I posted) via v4l2 buffers (the same interface you'd get image data, too).
Preexisting calibration data are just XML files with params to load to the ISP and params to use to determine which set of params to load based on statistics collected from ISP (like after detecting what kind of light the scene has, you have to load params calibrated for that light type).
(I do rotation via RGA, so maybe you mean that? That's a separate HW block, not part of ISP.)
Preexisting calibration data are just XML files with params to load to the ISP and params to use to determine which set of params to load based on statistics collected from ISP (like after detecting what kind of light the scene has, you have to load params calibrated for that light type).
(I do rotation via RGA, so maybe you mean that? That's a separate HW block, not part of ISP.)