#### change the last rule of /etc/udev/rules.d/81-pwm-noroot.rules to:

# create symlinks in /dev/pwm
SUBSYSTEM=="pwm", ENV{DEVTYPE}=="pwm_channel", ACTION=="add", ENV{PWM_NAME}!="", \
        RUN+="/bin/mkdir -p /dev/pwm", \
        RUN+="/bin/ln -sT '/sys/class/pwm/%k' /dev/pwm/%E{PWM_NAME}", \
        TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/dev/pwm/%E{PWM_NAME}"


#### BEWARE: pay attention to the presence or absence of backslashes at the end of each line!
#### (escaping newlines is required to be able to split an udev rule across multiple lines,
#### similar to macros in C)