Hi,
My short answer would be to just go ahead and port it to media controller, soc_camera is deprecated and we have seen that eventually it could cause some framerate problems. We did the driver for the x43 [1] and now we are moving it to media controller too. If you are interested we can do the porting for you as well.
In any case, if you want to give it a try I think you should start from ov5693 media controller driver and modify it to create your driver. You can look on the L4T documentation that you can download from https://developer.nvidia.com/embedded/downloads
[1]Toshiba TC358743 Linux driver for Jetson TX1 - RidgeRun Developer Connection