Hi,
For confirming SPI master is well set up on Orin, please use this binary:
How to set to spi slave mode - #5 by ShaneCCC
And try the command:
sudo ./spidev_test -D /dev/spidev0.0 -s8000000 -g256 -b32 -H -p0 -n1 -zzz -t
If above command can be run successfully, the SPI master should be good, And then please add prints in tpm_tis_spi_main.c to check if the driver is run. May add prints in probe function.