linux/Documentation/devicetree/bindings/spi/sh-msiof.txt
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   1Renesas MSIOF spi controller
   2
   3Required properties:
   4- compatible :  "renesas,sh-msiof" for SuperH or
   5                "renesas,sh-mobile-msiof" for SH Mobile series
   6- reg : Offset and length of the register set for the device
   7- interrupts : interrupt line used by MSIOF
   8
   9Optional properties:
  10- num-cs                : total number of chip-selects
  11- renesas,tx-fifo-size  : Overrides the default tx fifo size given in words
  12- renesas,rx-fifo-size  : Overrides the default rx fifo size given in words
  13