hello 2309200691,
Jetson AGX Thor Developer Kit using below board configuration.
$ ll jetson-agx-thor-devkit.conf
jetson-agx-thor-devkit.conf -> p3834-0008-p4071-0000-nvme.conf
please also refer to below..
$public_sources/kernel_src/hardware/nvidia/t264/nv-public/overlay/tegra264-p3971-0000+p3834-xxxx-csi.dts
overlay-name = "Jetson AGX CSI Connector";
compatible = "nvidia,p3971-0050+p3834-0005", "nvidia,p3971-0080+p3834-0008", "nvidia,p3971-0089+p3834-0008";
as you can see.. you should flash your target with the those SKUs (i.e. p3971) to enable CSI configuration.
see-also Jetson_Linux_Release_Notes_r38.4.pdf for section [7. Implementation Details] to have implementation.