1 STMicroelectronics STM32 Serial Audio Interface (SAI).
3 The SAI interface (Serial Audio Interface) offers a wide set of audio protocols
4 as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
5 The SAI contains two independent audio sub-blocks. Each sub-block has
6 its own clock generator and I/O lines controller.
9 - compatible: Should be "st,stm32f4-sai"
10 - reg: Base address and size of SAI common register set.
11 - clocks: Must contain phandle and clock specifier pairs for each entry
13 - clock-names: Must contain "x8k" and "x11k"
14 "x8k": SAI parent clock for sampling rates multiple of 8kHz.
15 "x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
16 - interrupts: cpu DAI interrupt line shared by SAI sub-blocks
19 - resets: Reference to a reset controller asserting the SAI
22 Two subnodes corresponding to SAI sub-block instances A et B can be defined.
23 Subnode can be omitted for unsused sub-block.
25 SAI subnodes required properties:
26 - compatible: Should be "st,stm32-sai-sub-a" or "st,stm32-sai-sub-b"
27 for SAI sub-block A or B respectively.
28 - reg: Base address and size of SAI sub-block register set.
29 - clocks: Must contain one phandle and clock specifier pair
30 for sai_ck which feeds the internal clock generator.
31 - clock-names: Must contain "sai_ck".
32 - dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
33 - dma-names: identifier string for each DMA request line
34 "tx": if sai sub-block is configured as playback DAI
35 "rx": if sai sub-block is configured as capture DAI
36 - pinctrl-names: should contain only value "default"
37 - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/pinctrl-stm32.txt
41 compatible = "audio-graph-card";
46 compatible = "st,stm32f4-sai";
50 reg = <0x40015800 0x4>;
51 clocks = <&rcc 1 CLK_SAIQ_PDIV>, <&rcc 1 CLK_I2SQ_PDIV>;
52 clock-names = "x8k", "x11k";
55 sai1b: audio-controller@40015824 {
56 #sound-dai-cells = <0>;
57 compatible = "st,stm32-sai-sub-b";
58 reg = <0x40015824 0x1C>;
59 clocks = <&rcc 1 CLK_SAI2>;
60 clock-names = "sai_ck";
61 dmas = <&dma2 5 0 0x400 0x0>;
63 pinctrl-names = "default";
64 pinctrl-0 = <&pinctrl_sai1b>;
72 cpu_endpoint: endpoint {
73 remote-endpoint = <&codec_endpoint>;
74 audio-graph-card,format = "i2s";
75 audio-graph-card,bitclock-master = <&codec_endpoint>;
76 audio-graph-card,frame-master = <&codec_endpoint>;
85 codec_endpoint: endpoint {
86 remote-endpoint = <&cpu_endpoint>;