TX2 why spi1.0 device can not found in /dev?

I can see spi1.0 in system
t186:/sys/bus/spi/drivers # ls -l
total 0
drwxr-xr-x 2 root root 0 2000-01-01 10:56 lr388k7_ts
drwxr-xr-x 2 root root 0 2000-01-01 10:56 qspi_mtd
drwxr-xr-x 2 root root 0 2000-01-01 10:56 rm_ts_spidev

t186:/sys/bus/spi/devices # ls -l
total 0
lrwxrwxrwx 1 root root 0 2000-01-01 10:53 spi0.0 -> …/…/…/devices/3210000.spi/spi_master/spi0/spi0.0
lrwxrwxrwx 1 root root 0 2000-01-01 10:53 spi0.1 -> …/…/…/devices/3210000.spi/spi_master/spi0/spi0.1
lrwxrwxrwx 1 root root 0 2000-01-01 10:53 spi1.0 -> …/…/…/devices/c260000.spi/spi_master/spi1/spi1.0

why i can not found the spi1.0 device in /dev? the spi1.0 can work ok? or what can i do?

Please refer to below topic:
https://devtalk.nvidia.com/default/topic/1024806/jetson-tx2/how-to-enable-spi-spidev-on-28-1-on-target-/