%C Driver for MX21 CSPI controllersSyntax:  spi-master -d mx21 [option[,option ...]] ... &Options (to override autodetected defaults):  base=address        Base address of CSPI controller, default 0x1000E000  irq=num             IRQ of the interface, default 16  clock=num           CSPI clock, default 33.25MHz  period=[32K=]num    CSPI sample period clock, default 0Examples:  # Start CSPI driver with base address, IRQ and period clock  spi-master -d mx21 base=0x1000F000,irq=15,period=32K=2