@beaglebone:~$ ls -ld /dev/pwm/*
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ecap0 -> /sys/class/pwm/pwm-0:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ecap1 -> /sys/class/pwm/pwm-3:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ecap2 -> /sys/class/pwm/pwm-6:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm0a -> /sys/class/pwm/pwm-1:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm0b -> /sys/class/pwm/pwm-1:1
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm1a -> /sys/class/pwm/pwm-4:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm1b -> /sys/class/pwm/pwm-4:1
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm2a -> /sys/class/pwm/pwm-7:0
lrwxrwxrwx 1 root root 22 Jan 28 19:15 /dev/pwm/ehrpwm2b -> /sys/class/pwm/pwm-7:1