| 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 |
| |
