1STMicroelectronics STM32 SPI/I2S Controller
2
3The SPI/I2S block supports I2S/PCM protocols when configured on I2S mode.
4Only some SPI instances support I2S.
5
6Required 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.txt
22
23Optional properties:
24  - resets: Reference to a reset controller asserting the reset controller
25
26The device node should contain one 'port' child node with one child 'endpoint'
27node, according to the bindings defined in Documentation/devicetree/bindings/
28graph.txt.
29
30Example:
31sound_card {
32	compatible = "audio-graph-card";
33	dais = <&i2s2_port>;
34};
35
36i2s2: 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
56audio-codec {
57	codec_port: port@0 {
58		codec_endpoint: endpoint {
59			remote-endpoint = <&cpu_endpoint>;
60		};
61	};
62};
63