BARS

Hi.
I need to run FAN control on the Rock 3a board. But i don't have rk3568-pwm8-m0-fan.dtbo in boot/dtb-6.0.10-rk35xx/rockchip/overlay. I copied rk3568-pwm8-m0-fan.dtbo from 4.19.193-67-rockchip folder. This script applied on the start:
Applying kernel provided DT overlay rk3568-pwm8-m0-fan.dtbo 2698 bytes read in 52 ms (49.8 KiB/s)  
The /sys/devices/platform/fe6f0000.pwm folder is being created. I apllyed this commands:
root@rock-3a:~# echo 0 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/export root@rock-3a:~# echo 10000 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/period root@rock-3a:~# echo 5000 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/duty_cycle root@rock-3a:~# echo normal > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/polarity root@rock-3a:~# echo 1 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/enable # Turn on fan root@rock-3a:~# echo 0 > /sys/devices/platform/fe*.pwm/pwm/pwmchip*/pwm0/enable # Turn off fan But there is no PWM on the FAN connector. I see 800 mV DC voltage on the PWM pinin the FAN connector. How I can run the FAN PWM?