Hi 2668729889,
Are you using the devkit or custom board for Orin Nano?
What’s the Jetpack version in use?
Are you using SPI0 or SPI1?
If you want to use SPI as Slave, please refer to the following thread to configure in device tree.
SPI0 interface configured as a slave in Jetson Xavier NX - #10 by borjabasket14