This adds support for the third (optional) pwm cell to specify the
polarity, which is needed by display backlights for example.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: NEric Anholt <eric@anholt.net>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>