regulator: rt4801: Add support for RT4801 Display Bias regulator driver
Adds support for the RT4801 DSV. It has two regulators (DSVP/DSVN) with an I2C interface. DSVP/DSVN can provide the display panel module for the positive/negative voltage range from (+/-)4V to (+/-)6V. Signed-off-by: ChiYuan Huang <cy_huang@richtek.com> Link: https://lore.kernel.org/r/1597461262-25878-1-git-send-email-u0084500@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>
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