Based on kernel version 5.6.13
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 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.yaml 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>; }; }; }; |