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The following functionalities are supported: - write, read from volatile memory Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf Signed-off-by: Slawomir Stepien <sst@poczta.fm> Reviewed-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>