[ Upstream commit bf43a71a0a7f396434f6460b46e33eb00752f78d ] Add devicetree binding document for ADXL355, a 3-Axis MEMS Accelerometer. Signed-off-by: Puranjay Mohan <puranjay12@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20210811073027.124619-2-puranjay12@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Sasha Levin <sashal@kernel.org>