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

A100 平板电脑开启自带的喇叭麦克风