Below are the code of the spidev_test.c form the kernel, I can run it under the 'bits of per word=8' but can not set it to 16. I wonder konw why. /* * SPI testing utility (using spidev driver) * * Copyright (c) 2007 MontaVista Software, Inc. * Copyright (c) 2007 Anton Vorontsov <avorontsov@ru.mvista...