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Add a pwm subsystem so we can configure pwm controller from kernel and userland.

Description

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

Details

Provenance
manuAuthored on
Reviewer
bcr
Differential Revision
D17938: Add a PWM subsystem
Parents
rS342002: Add NETGRAPH_CHECKSUM.
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