tree fd742c9a790f1d2279e3f3a9e4818c2ee41d62c6
parent 6eec723e39e84d0c980ae3db8dba0bbd051151a3
author Patrick Venture <venture@google.com> 1513789709 -0800
committer Brad Bishop <bradleyb@fuzziesquirrel.com> 1517338277 +0000

Add Control.FanPwm interface

The following reference indicates that pwm[n], when available
are consistently implemented.  Therefore, it's a valid approach.

https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface

I'd like to use this interface with phosphor-hwmon to control our
fans in a similar fashion to RPM-driven control via a target.

Change-Id: Ic1d9363d616e650ba7d5162f424700d6768cdf1f
Signed-off-by: Patrick Venture <venture@google.com>