forked from Minki/linux
ea6055c46e
Since commit39a6ac11df("spi/pl022: Devicetree support w/o platform data") the 'num-cs' parameter cannot be passed through platform data when probing with devicetree. Instead, it's a required devicetree property. Fix the binding documentation so the property is properly specified. Fixes:39a6ac11df("spi/pl022: Devicetree support w/o platform data") Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Mark Brown <broonie@kernel.org>
71 lines
2.3 KiB
Plaintext
71 lines
2.3 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
|
|
- num-cs : total number of chipselects
|
|
|
|
Optional properties:
|
|
- 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)
|
|
- dmas : Two or more DMA channel specifiers following the convention outlined
|
|
in bindings/dma/dma.txt
|
|
- dma-names: Names for the dma channels, if present. There must be at
|
|
least one channel named "tx" for transmit and named "rx" for
|
|
receive.
|
|
|
|
|
|
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
|
|
|
|
|
|
Example:
|
|
|
|
spi@e0100000 {
|
|
compatible = "arm,pl022", "arm,primecell";
|
|
reg = <0xe0100000 0x1000>;
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
interrupts = <0 31 0x4>;
|
|
dmas = <&dma-controller 23 1>,
|
|
<&dma-controller 24 0>;
|
|
dma-names = "rx", "tx";
|
|
|
|
m25p80@1 {
|
|
compatible = "st,m25p80";
|
|
reg = <1>;
|
|
spi-max-frequency = <12000000>;
|
|
spi-cpol;
|
|
spi-cpha;
|
|
pl022,hierarchy = <0>;
|
|
pl022,interface = <0>;
|
|
pl022,slave-tx-disable;
|
|
pl022,com-mode = <0x2>;
|
|
pl022,rx-level-trig = <0>;
|
|
pl022,tx-level-trig = <0>;
|
|
pl022,ctrl-len = <0x11>;
|
|
pl022,wait-state = <0>;
|
|
pl022,duplex = <0>;
|
|
};
|
|
};
|
|
|