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The SSC is currently not usable with the ASoC simple-audio-card, as every SSC audio user has to build a platform driver that may do as little as calling atmel_ssc_set_audio/atmel_ssc_put_audio (which allocates the SSC and registers a DAI with the ASoC subsystem). So, have that happen automatically, if the #sound-dai-cells property is present in devicetree, which it has to be anyway for simple audio card to work. Signed-off-by: Peter Rosin <peda@axentia.se> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
* Atmel SSC driver.
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Required properties:
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- compatible: "atmel,at91rm9200-ssc" or "atmel,at91sam9g45-ssc"
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- atmel,at91rm9200-ssc: support pdc transfer
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- atmel,at91sam9g45-ssc: support dma transfer
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- reg: Should contain SSC registers location and length
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- interrupts: Should contain SSC interrupt
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- clock-names: tuple listing input clock names.
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Required elements: "pclk"
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- clocks: phandles to input clocks.
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Required properties for devices compatible with "atmel,at91sam9g45-ssc":
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- dmas: DMA specifier, consisting of a phandle to DMA controller node,
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the memory interface and SSC DMA channel ID (for tx and rx).
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See Documentation/devicetree/bindings/dma/atmel-dma.txt for details.
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- dma-names: Must be "tx", "rx".
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Optional properties:
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- atmel,clk-from-rk-pin: bool property.
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- When SSC works in slave mode, according to the hardware design, the
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clock can get from TK pin, and also can get from RK pin. So, add
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this parameter to choose where the clock from.
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- By default the clock is from TK pin, if the clock from RK pin, this
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property is needed.
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- #sound-dai-cells: Should contain <0>.
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- This property makes the SSC into an automatically registered DAI.
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Examples:
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- PDC transfer:
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ssc0: ssc@fffbc000 {
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compatible = "atmel,at91rm9200-ssc";
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reg = <0xfffbc000 0x4000>;
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interrupts = <14 4 5>;
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clocks = <&ssc0_clk>;
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clock-names = "pclk";
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};
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- DMA transfer:
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ssc0: ssc@f0010000 {
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compatible = "atmel,at91sam9g45-ssc";
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reg = <0xf0010000 0x4000>;
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interrupts = <28 4 5>;
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dmas = <&dma0 1 13>,
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<&dma0 1 14>;
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dma-names = "tx", "rx";
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_ssc0_tx &pinctrl_ssc0_rx>;
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status = "disabled";
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};
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