It seems that with the V4L2 drivers, external trigger mode is enabled with the following command or similiar: v4l2-ctl -d /dev/v4l-subdev0 -c trigger_mode= 1
https://docs.arducam.com/Raspberry-Pi-Camera/Global-Shutter-Camera/external-trigger/
However it does not appear that that the OV9281 B0165 rev B has the trigger_mode option. Why is that? Can it be fixed?
Our product has been using the external trigger mode of the OV9281 with the MIPI_camera driver. The driver works with the older B0165 board but does not seem to work with the new one.