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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
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treea94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/devicetree/bindings/sound/st,stm32-sai.txt
parentInitial commit. (diff)
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+STMicroelectronics STM32 Serial Audio Interface (SAI).
+
+The SAI interface (Serial Audio Interface) offers a wide set of audio protocols
+as I2S standards, LSB or MSB-justified, PCM/DSP, TDM, and AC'97.
+The SAI contains two independent audio sub-blocks. Each sub-block has
+its own clock generator and I/O lines controller.
+
+Required properties:
+ - compatible: Should be "st,stm32f4-sai" or "st,stm32h7-sai"
+ - reg: Base address and size of SAI common register set.
+ - clocks: Must contain phandle and clock specifier pairs for each entry
+ in clock-names.
+ - clock-names: Must contain "pclk" "x8k" and "x11k"
+ "pclk": Clock which feeds the peripheral bus interface.
+ Mandatory for "st,stm32h7-sai" compatible.
+ Not used for "st,stm32f4-sai" compatible.
+ "x8k": SAI parent clock for sampling rates multiple of 8kHz.
+ "x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
+ - interrupts: cpu DAI interrupt line shared by SAI sub-blocks
+
+Optional properties:
+ - resets: Reference to a reset controller asserting the SAI
+
+SAI subnodes:
+Two subnodes corresponding to SAI sub-block instances A et B can be defined.
+Subnode can be omitted for unsused sub-block.
+
+SAI subnodes required properties:
+ - compatible: Should be "st,stm32-sai-sub-a" or "st,stm32-sai-sub-b"
+ for SAI sub-block A or B respectively.
+ - reg: Base address and size of SAI sub-block register set.
+ - clocks: Must contain one phandle and clock specifier pair
+ for sai_ck which feeds the internal clock generator.
+ If the SAI shares a master clock, with another SAI set as MCLK
+ clock provider, SAI provider phandle must be specified here.
+ - clock-names: Must contain "sai_ck".
+ Must also contain "MCLK", if SAI shares a master clock,
+ with a SAI set as MCLK clock provider.
+ - dmas: see Documentation/devicetree/bindings/dma/st,stm32-dma.yaml
+ - dma-names: identifier string for each DMA request line
+ "tx": if sai sub-block is configured as playback DAI
+ "rx": if sai sub-block is configured as capture DAI
+ - pinctrl-names: should contain only value "default"
+ - pinctrl-0: see Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
+
+SAI subnodes Optional properties:
+ - st,sync: specify synchronization mode.
+ By default SAI sub-block is in asynchronous mode.
+ This property sets SAI sub-block as slave of another SAI sub-block.
+ Must contain the phandle and index of the sai sub-block providing
+ the synchronization.
+ - st,iec60958: support S/PDIF IEC6958 protocol for playback
+ IEC60958 protocol is not available for capture.
+ By default, custom protocol is assumed, meaning that protocol is
+ configured according to protocol defined in related DAI link node,
+ such as i2s, left justified, right justified, dsp and pdm protocols.
+ Note: ac97 protocol is not supported by SAI driver
+ - #clock-cells: should be 0. This property must be present if the SAI device
+ is a master clock provider, according to clocks bindings, described in
+ Documentation/devicetree/bindings/clock/clock-bindings.txt.
+
+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 = <&sai1b_port>;
+};
+
+sai1: sai1@40015800 {
+ compatible = "st,stm32h7-sai";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0 0x40015800 0x400>;
+ reg = <0x40015800 0x4>;
+ clocks = <&rcc SAI1_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
+ clock-names = "pclk", "x8k", "x11k";
+ interrupts = <87>;
+
+ sai1a: audio-controller@40015804 {
+ compatible = "st,stm32-sai-sub-a";
+ reg = <0x4 0x1C>;
+ clocks = <&rcc SAI1_CK>;
+ clock-names = "sai_ck";
+ dmas = <&dmamux1 1 87 0x400 0x0>;
+ dma-names = "tx";
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sai1a>;
+
+ sai1b_port: port {
+ cpu_endpoint: endpoint {
+ remote-endpoint = <&codec_endpoint>;
+ format = "i2s";
+ };
+ };
+ };
+};
+
+audio-codec {
+ codec_port: port {
+ codec_endpoint: endpoint {
+ remote-endpoint = <&cpu_endpoint>;
+ };
+ };
+};