No target_ PWM file how can I control the fan?

hi:
How do I control the TX2 fan?
Here is the output for the command
root@MSD:/sys/devices/pwm-fan# ls -l /sys/devices/pwm-fan/
total 0
-rw-r–r-- 1 root root 4096 9 18 06:10 driver_override
-r–r--r-- 1 root root 4096 9月 18 06:10 modalias
lrwxrwxrwx 1 root root 0 9月 18 06:10 of_node -> …/…/firmware/devicetree/base/pwm-fan
drwxr-xr-x 2 root root 0 18 06:10 power
lrwxrwxrwx 1 root root 0 1月 28 2018 subsystem -> …/…/bus/platform
-rw-r–r-- 1 root root 4096 28 2018 uevent
No target_ PWM file how can I control the fan ?

hello 1481453418,

please have a try to control it via hardware monitor.
for example, you may check below hw monitors for their capability,

$ cat /sys/class/hwmon/hwmon*/name
thermal-fan-est
pwm_tach
tegra_pwmfan

please have a try to configure rpm values of pwm_tach nodes to control your fan,
thanks