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pwm: Document signal polarity convention
authorThierry Reding <thierry.reding@gmail.com>
Mon, 7 Apr 2014 13:45:30 +0000 (15:45 +0200)
committerThierry Reding <thierry.reding@gmail.com>
Mon, 28 Apr 2014 11:04:59 +0000 (13:04 +0200)
The PWM subsystem defines normal and inversed PWM signal polarity in an
unambiguous way. In addition to the documentation in the linux/pwm.h
header file, add a paragraph in Documentation/pwm.txt because people are
likely to look there for guidance.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

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