hello clex.riegler,
please access download center to download Jetson Xavier NX Product Design Guide. you should refer to [Figure 9-3. Available Camera Control Pins] for the control pins for using 4 cameras.
it’s GPIO-based i2c bus multiplexer, which uses GPIOs to route the i2c signals.
there’s kernel documentation, it also shows the paragraph to demonstrate the bindings.
for example,
$L4T_Sources/r32.6.1/Linux_for_Tegra/source/public/kernel/kernel-4.9/Documentation/devicetree/bindings/i2c/i2c-mux-gpio.txt
+-----+ +-----+
| dev | | dev |
+------------+ +-----+ +-----+
| SoC | | |
| | /--------+--------+
| +------+ | +------+ child bus A, on GPIO value set to 0
| | I2C |-|--| Mux |
| +------+ | +--+---+ child bus B, on GPIO value set to 1
| | | \----------+--------+--------+
| +------+ | | | | |
| | GPIO |-|-----+ +-----+ +-----+ +-----+
| +------+ | | dev | | dev | | dev |
+------------+ +-----+ +-----+ +-----+