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ASoC: stm32: Document STM32 I2S bindings

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Add documentation of device tree bindings for STM32 SPI/I2S.

Signed-off-by: olivier moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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olivier moysan 2017-05-18 17:19:51 +02:00 committed by Mark Brown
parent 2ea659a9ef
commit da23173d5c
1 changed files with 62 additions and 0 deletions
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Documentation/devicetree/bindings/sound/st,stm32-i2s.txt Normal file
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STMicroelectronics STM32 SPI/I2S Controller
The SPI/I2S block supports I2S/PCM protocols when configured on I2S mode.
Only some SPI instances support I2S.
Required properties:
- compatible: Must be "st,stm32h7-i2s"
- reg: Offset and length of the device's register set.
- interrupts: Must contain the interrupt line id.
- clocks: Must contain phandle and clock specifier pairs for each entry
in clock-names.
- clock-names: Must contain "i2sclk", "pclk", "x8k" and "x11k".
"i2sclk": clock which feeds the internal clock generator
"pclk": clock which feeds the peripheral bus interface
"x8k": I2S parent clock for sampling rates multiple of 8kHz.
"x11k": I2S parent clock for sampling rates multiple of 11.025kHz.
- dmas: DMA specifiers for tx and rx dma.
See Documentation/devicetree/bindings/dma/stm32-dma.txt.
- dma-names: Identifier for each DMA request line. Must be "tx" and "rx".
- pinctrl-names: should contain only value "default"
- pinctrl-0: see Documentation/devicetree/bindings/pinctrl/pinctrl-stm32.txt
Optional properties:
- resets: Reference to a reset controller asserting the reset controller
The device node should contain one 'port' child node with one child 'endpoint'
node, according to the bindings defined in Documentation/devicetree/bindings/
graph.txt.
Example:
sound_card {
compatible = "audio-graph-card";
dais = <&i2s2_port>;
};
i2s2: audio-controller@40003800 {
compatible = "st,stm32h7-i2s";
reg = <0x40003800 0x400>;
interrupts = <36>;
clocks = <&rcc PCLK1>, <&rcc SPI2_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
clock-names = "pclk", "i2sclk", "x8k", "x11k";
dmas = <&dmamux2 2 39 0x400 0x1>,
<&dmamux2 3 40 0x400 0x1>;
dma-names = "rx", "tx";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2s2>;
i2s2_port: port@0 {
cpu_endpoint: endpoint {
remote-endpoint = <&codec_endpoint>;
format = "i2s";
};
};
};
audio-codec {
codec_port: port@0 {
codec_endpoint: endpoint {
remote-endpoint = <&cpu_endpoint>;
};
};
};