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/st,stm32-pinctrl.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>;
|
};
|
};
|
};
|
