Kernel-4.18.0-80.el8_st,stm32-i2s

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>;
};
};
};