hello Gorgo90,
are you going to have all Rbpcv2_IMX219 sensor modes, mode0-3 as 2-lane config and mode4 as 4-lane config?
is should be doable, however, please try disable all other 2-lane sensor modes for your bring-up stage.
don’t this should be num_csi_lanes = <14>;?
since you have five 2-lane and one 4-lane camera in the system.
yes, you may roll-back to single camera configuration, and setting num_csi_lanes = <4> in your tegra-camera-platform{...} fields.
honestly, we don’t verify 4-lane configure for this camera board.
you may survey whether this is supported, for example, please see-also raspberrypi’s discussion thread,
difference between 2-lane and 4-lane MIPI CSI camera port? - Raspberry Pi Stack Exchange