63 lines
2 KiB
Plaintext
63 lines
2 KiB
Plaintext
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STMicroelectronics STM32 SPI/I2S Controller
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The SPI/I2S block supports I2S/PCM protocols when configured on I2S mode.
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Only some SPI instances support I2S.
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Required properties:
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- compatible: Must be "st,stm32h7-i2s"
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- reg: Offset and length of the device's register set.
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- interrupts: Must contain the interrupt line id.
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- clocks: Must contain phandle and clock specifier pairs for each entry
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in clock-names.
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- clock-names: Must contain "i2sclk", "pclk", "x8k" and "x11k".
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"i2sclk": clock which feeds the internal clock generator
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"pclk": clock which feeds the peripheral bus interface
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"x8k": I2S parent clock for sampling rates multiple of 8kHz.
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"x11k": I2S parent clock for sampling rates multiple of 11.025kHz.
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- dmas: DMA specifiers for tx and rx dma.
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See Documentation/devicetree/bindings/dma/stm32-dma.txt.
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- dma-names: Identifier for each DMA request line. Must be "tx" and "rx".
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- pinctrl-names: should contain only value "default"
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- pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.txt
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Optional properties:
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- resets: Reference to a reset controller asserting the reset controller
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The device node should contain one 'port' child node with one child 'endpoint'
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node, according to the bindings defined in Documentation/devicetree/bindings/
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graph.txt.
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Example:
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sound_card {
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compatible = "audio-graph-card";
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dais = <&i2s2_port>;
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};
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i2s2: audio-controller@40003800 {
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compatible = "st,stm32h7-i2s";
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reg = <0x40003800 0x400>;
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interrupts = <36>;
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clocks = <&rcc PCLK1>, <&rcc SPI2_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
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clock-names = "pclk", "i2sclk", "x8k", "x11k";
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dmas = <&dmamux2 2 39 0x400 0x1>,
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<&dmamux2 3 40 0x400 0x1>;
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dma-names = "rx", "tx";
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_i2s2>;
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i2s2_port: port@0 {
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cpu_endpoint: endpoint {
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remote-endpoint = <&codec_endpoint>;
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format = "i2s";
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};
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};
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};
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audio-codec {
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codec_port: port@0 {
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codec_endpoint: endpoint {
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remote-endpoint = <&cpu_endpoint>;
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};
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};
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};
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