Documentation/devicetree/bindings/sound/st,stm32-i2s.txt

   1 STMicroelectronics STM32 SPI/I2S Controller
   2
   3 The SPI/I2S block supports I2S/PCM protocols when configured on I2S mode.
   4 Only some SPI instances support I2S.
   5
   6 Required properties:
   7   - compatible: Must be "st,stm32h7-i2s"
   8   - reg: Offset and length of the device's register set.
   9   - interrupts: Must contain the interrupt line id.
  10   - clocks: Must contain phandle and clock specifier pairs for each entry
  11         in clock-names.
  12   - clock-names: Must contain "i2sclk", "pclk", "x8k" and "x11k".
  13         "i2sclk": clock which feeds the internal clock generator
  14         "pclk": clock which feeds the peripheral bus interface
  15         "x8k": I2S parent clock for sampling rates multiple of 8kHz.
  16         "x11k": I2S parent clock for sampling rates multiple of 11.025kHz.
  17   - dmas: DMA specifiers for tx and rx dma.
  18     See Documentation/devicetree/bindings/dma/stm32-dma.txt.
  19   - dma-names: Identifier for each DMA request line. Must be "tx" and "rx".
  20   - pinctrl-names: should contain only value "default"
  21   - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
  22
  23 Optional properties:
  24   - resets: Reference to a reset controller asserting the reset controller
  25
  26 The device node should contain one 'port' child node with one child 'endpoint'
  27 node, according to the bindings defined in Documentation/devicetree/bindings/
  28 graph.txt.
  29
  30 Example:
  31 sound_card {
  32         compatible = "audio-graph-card";
  33         dais = <&i2s2_port>;
  34 };
  35
  36 i2s2: audio-controller@40003800 {
  37         compatible = "st,stm32h7-i2s";
  38         reg = <0x40003800 0x400>;
  39         interrupts = <36>;
  40         clocks = <&rcc PCLK1>, <&rcc SPI2_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
  41         clock-names = "pclk", "i2sclk",  "x8k", "x11k";
  42         dmas = <&dmamux2 2 39 0x400 0x1>,
  43            <&dmamux2 3 40 0x400 0x1>;
  44         dma-names = "rx", "tx";
  45         pinctrl-names = "default";
  46         pinctrl-0 = <&pinctrl_i2s2>;
  47
  48         i2s2_port: port@0 {
  49                 cpu_endpoint: endpoint {
  50                         remote-endpoint = <&codec_endpoint>;
  51                         format = "i2s";
  52                 };
  53         };
  54 };
  55
  56 audio-codec {
  57         codec_port: port@0 {
  58                 codec_endpoint: endpoint {
  59                         remote-endpoint = <&cpu_endpoint>;
  60                 };
  61         };
  62 };