spi: pl022: use generic DMA slave configuration if possible

[~andy/linux] / Documentation / devicetree / bindings / spi / spi_pl022.txt

diff --git a/Documentation/devicetree/bindings/spi/spi_pl022.txt b/Documentation/devicetree/bindings/spi/spi_pl022.txt
index f158fd31cfda71a3ab69984c54cbeab3fa22bc61..22ed6797216d70e3ddcf6f30e40a07d7ea559f1d 100644 (file)
--- a/Documentation/devicetree/bindings/spi/spi_pl022.txt
+++ b/Documentation/devicetree/bindings/spi/spi_pl022.txt
@@ -16,6 +16,11 @@ Optional properties:
                             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
@@ -32,3 +37,34 @@ contain the following properties.
 - 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>;
+               };
+       };
+