Add DT binding document for Richtek RT6160 voltage regulator.
Signed-off-by: NChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1622611906-2403-1-git-send-email-u0084500@gmail.comSigned-off-by: NMark Brown <broonie@kernel.org>