PWM (#3) has wrong frequency

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Setup for 5kHz resulting in 1kHz

root@bpi-r2:~# echo 3 >/sys/class/pwm/pwmchip0/export
root@bpi-r2:~# echo 200000 >/sys/class/pwm/pwmchip0/pwm3/period
root@bpi-r2:~# echo 100000 >/sys/class/pwm/pwmchip0/pwm3/duty_cycle
root@bpi-r2:~# echo 1 >/sys/class/pwm/pwmchip0/pwm3/enable

see here for more: http://forum.banana-pi.org/t/gpio-python-or-shell/3912/37

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nearly fixed with 79ed6b7 (~5% inaccuracy)

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inaccuracy fixed with 3a850c8