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The replicape servo pins (P9_14/P9_16) are muxed to the SOCs hardware PWM unit driven by a 13MHz GP timer. They have to be driven by the linux host mcu. This commits adds hardware PWM support using the linux sysfs user space interface. Signed-off-by: Janne Grunau <janne-3d@jannau.net> Signed-off-by: Kevin O'Connor <kevin@koconnor.net>