manu 561baae05e Add a pwm subsystem so we can configure pwm controller from kernel and userland.
The pwm subsystem consist of API for PWM controllers, pwmbus to register them
and a pwm(8) utility to talk to them from userland.

Reviewed by:	oshgobo (capsicum), bcr (manpage), 0mp (manpage)
Differential Revision:	https://reviews.freebsd.org/D17938
2018-12-12 20:56:56 +00:00
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