mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
39a6ac11df
Even with devicetree support, we needed platform data to provide some data, leading to mixed device tree and platform data. This patch makes it possible to provide all that information via device tree. Now, the data must be provided via platform data _or_ device tree completely. Only in case of DMA where a callback specification is necessary (dma_filter()), platform data is the only option. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
35 lines
1.4 KiB
Plaintext
35 lines
1.4 KiB
Plaintext
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
|
|
|