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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" |
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21 | - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml |
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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 | }; |
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