cat /sys/kernel/debug/pwm
root@dragonboard:/sys/kernel/debug/dispdbg# cat /sys/kernel/debug/pwm
platform/300a000.pwm, 16 PWM devices
pwm-0 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-1 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-2 (lcd ): requested period: 20000 ns duty: 7812 ns polarity: normal
pwm-3 (lcd ): requested enabled period: 20000 ns duty: 19922 ns polarity: inverse
pwm-4 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-5 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-6 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-7 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-8 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-9 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-10 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-11 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-12 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-13 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-14 ((null) ): period: 0 ns duty: 0 ns polarity: normal
pwm-15 ((null) ): period: 0 ns duty: 0 ns polarity: normal