Documentation/devicetree/bindings/spi/spi_pl022.txt

   1 ARM PL022 SPI controller
   2
   3 Required properties:
   4 - compatible : "arm,pl022", "arm,primecell"
   5 - reg : Offset and length of the register set for the device
   6 - interrupts : Should contain SPI controller interrupt
   7
   8 Optional properties:
   9 - num-cs : total number of chipselects
  10 - cs-gpios : should specify GPIOs used for chipselects.
  11   The gpios will be referred to as reg = <index> in the SPI child nodes.
  12   If unspecified, a single SPI device without a chip select can be used.
  13 - pl022,autosuspend-delay : delay in ms following transfer completion before
  14                             the runtime power management system suspends the
  15                             device. A setting of 0 indicates no delay and the
  16                             device will be suspended immediately
  17 - pl022,rt : indicates the controller should run the message pump with realtime
  18              priority to minimise the transfer latency on the bus (boolean)
  19
  20
  21 SPI slave nodes must be children of the SPI master node and can
  22 contain the following properties.
  23
  24 - pl022,interface : interface type:
  25         0: SPI
  26         1: Texas Instruments Synchronous Serial Frame Format
  27         2: Microwire (Half Duplex)
  28 - pl022,com-mode : polling, interrupt or dma
  29 - pl022,rx-level-trig : Rx FIFO watermark level
  30 - pl022,tx-level-trig : Tx FIFO watermark level
  31 - pl022,ctrl-len : Microwire interface: Control length
  32 - pl022,wait-state : Microwire interface: Wait state
  33 - pl022,duplex : Microwire interface: Full/Half duplex
  34