Add dt bindings for AD7779 8-channel, simultaneous sampling ADC family with eight full Σ-Δ ADCs on chip and ultra-low input current to allow direct sensor connection. Signed-off-by: Ramona Alexandra Nechita <ramona.nechita@analog.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://patch.msgid.link/20241014143204.30195-2-ramona.nechita@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>