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Document the bindings for the Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor controller by an I2C interface, mainly used in 3D head-on motion sensing applications. The device can be configured with different sensitivities in factory, but the sensitivity value used to calculate value into the Gauss unit is not available from registers, thus the sensitivity is provided by the compatible/device-id string which is based on the part number as described in the datasheet page 2. Datasheet: https://www.allegromicro.com/-/media/files/datasheets/als31300-datasheet.pdf Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patch.msgid.link/20241030-topic-input-upstream-als31300-v4-2-494297c9e50a@linaro.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>