2011-09-23 14:56:53 +00:00
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ARM PL022 SPI controller
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Required properties:
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- compatible : "arm,pl022", "arm,primecell"
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- reg : Offset and length of the register set for the device
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- interrupts : Should contain SPI controller interrupt
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Optional properties:
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2012-08-22 13:49:18 +00:00
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- num-cs : total number of chipselects
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2011-09-23 14:56:53 +00:00
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- cs-gpios : should specify GPIOs used for chipselects.
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The gpios will be referred to as reg = <index> in the SPI child nodes.
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If unspecified, a single SPI device without a chip select can be used.
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2012-09-18 13:53:53 +00:00
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- pl022,autosuspend-delay : delay in ms following transfer completion before
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the runtime power management system suspends the
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device. A setting of 0 indicates no delay and the
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device will be suspended immediately
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- pl022,rt : indicates the controller should run the message pump with realtime
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priority to minimise the transfer latency on the bus (boolean)
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2011-09-23 14:56:53 +00:00
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2012-08-22 13:49:18 +00:00
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SPI slave nodes must be children of the SPI master node and can
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contain the following properties.
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- pl022,interface : interface type:
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0: SPI
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1: Texas Instruments Synchronous Serial Frame Format
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2: Microwire (Half Duplex)
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- pl022,com-mode : polling, interrupt or dma
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- pl022,rx-level-trig : Rx FIFO watermark level
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- pl022,tx-level-trig : Tx FIFO watermark level
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- pl022,ctrl-len : Microwire interface: Control length
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- pl022,wait-state : Microwire interface: Wait state
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- pl022,duplex : Microwire interface: Full/Half duplex
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