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The RF Digital RFD77402 is a Time-of-Flight (ToF) proximity and distance sensor that provides absolute and highly accurate distance measurements from 100 mm up to 2000 mm over an I2C interface. It includes an optional interrupt pin that signals when new measurement data is ready. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Signed-off-by: Shrikant Raskar <raskar.shree97@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>