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The ROHM BD79112 is an ADC/GPIO with 32 channels. The channel inputs can be used as ADC or GPIO. Using the GPIOs as IRQ sources isn't supported. The ADC is 12-bit, supporting input voltages up to 5.7V, and separate I/O voltage supply. Maximum SPI clock rate is 20 MHz (10 MHz with daisy-chain configuration) and maximum sampling rate is 1MSPS. Add a device tree binding document for the ROHM BD79112. Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Acked-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>