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| author |   Arnd Bergmann <arnd@arndb.de> | 2013-01-28 16:24:37 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2013-03-12 17:56:08 +0100 |
| commit | dc715452e9145156840b09df765ea2ede4851eda (patch) | |
| tree | 5e5916cbb0ef6562f444cfb54b5cf3fabef92aca /Documentation/devicetree | |
| parent | Linux 3.9-rc2 (diff) | |
| download | linux-dev-dc715452e9145156840b09df765ea2ede4851eda.tar.xz linux-dev-dc715452e9145156840b09df765ea2ede4851eda.zip | |
spi: pl022: use generic DMA slave configuration if possible
With the new OF DMA binding, it is possible to completely avoid the
need for platform_data for configuring a DMA channel. In cases where the
platform has already been converted, calling dma_request_slave_channel
should get all the necessary information from the device tree.
Like the patch that converts the dw_dma controller, this is completely
untested and is looking for someone to try it out.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: spi-devel-general@lists.sourceforge.net
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Vinod Koul <vinod.koul@linux.intel.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi_pl022.txt | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi_pl022.txt b/Documentation/devicetree/bindings/spi/spi_pl022.txt index f158fd31cfda..22ed6797216d 100644 --- 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>; + }; + }; + |