Add binding document for IMG Pulse Width Modulator (PWM) DAC present on
the Pistachio SOC. The PWM DAC has four channels.
Signed-off-by: NNaidu Tellapati <Naidu.Tellapati@imgtec.com>
Signed-off-by: NSai Masarapu <Sai.Masarapu@imgtec.com>
Signed-off-by: NEzequiel Garcia <ezequiel.garcia@imgtec.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>