Here are the pinouts for the Jetson TX1 and Jetson TX2.

J21 GPIO Header Pinouts – Jetson TX1/TX2

The Jetson TX1 and TX2 share the same carrier board. Here’s some info on the signals on the J21 GPIO Header:

Jetson TX1

J21 GPIO Header Pinout Diagram – Jetson TX1
Notes on Pinmux, Kernel, SPI and GPIO

Jetson TX2

J21 GPIO Header Pinout Diagram – Jetson TX2

Note: The I2C buss numbers are swapped on the Jetson TX2 versus the Jetson TX1.

GPIO Expansion Header – Jetson AGX Xavier

Information for the GPIO Expansion Header on the Jetson Xavier:

Jetson AGX Xavier Expansion Header Pinout