3 * 4 MIPI CSI driver for Xavier NX production board

Hi Everyone,
I need to configure 3 * 4 MIPI CSI 2 configuration in xavier NX production board for my custom sensor. Could any one give some Idea to implement. I have completed 1 * 2 MIPI driver for my custom sensor using imx390 driver.
1] What are the configuration I want to do in dtsi?.
2] Which file hold the pin configuration details of mipi csi lanes?.
3] Is any example driver is there?

Have a check the programing guide.