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ASoC: atmel: update atmel SSC with DMA binding

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As atmel-ssc can be used with DMA, the documentation should be updated.
Also, a configuration DMA example is given.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Richard Genoud 2013-07-30 12:32:04 +02:00 committed by Mark Brown
parent fdbcb3cba5
commit f813175aa5
1 changed files with 22 additions and 1 deletions
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23
Documentation/devicetree/bindings/misc/atmel-ssc.txt
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@ -7,9 +7,30 @@ Required properties:
- reg: Should contain SSC registers location and length
- interrupts: Should contain SSC interrupt
Example:
Required properties for devices compatible with "atmel,at91sam9g45-ssc":
- dmas: DMA specifier, consisting of a phandle to DMA controller node,
the memory interface and SSC DMA channel ID (for tx and rx).
See Documentation/devicetree/bindings/dma/atmel-dma.txt for details.
- dma-names: Must be "tx", "rx".
Examples:
- PDC transfer:
ssc0: ssc@fffbc000 {
compatible = "atmel,at91rm9200-ssc";
reg = <0xfffbc000 0x4000>;
interrupts = <14 4 5>;
};
- DMA transfer:
ssc0: ssc@f0010000 {
compatible = "atmel,at91sam9g45-ssc";
reg = <0xf0010000 0x4000>;
interrupts = <28 4 5>;
dmas = <&dma0 1 13>,
<&dma0 1 14>;
dma-names = "tx", "rx";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_ssc0_rx>;
status = "disabled";
};