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