On Tue, Apr 11, 2017 at 05:47:25PM +0200, olivier moysan wrote:
This patch adds documentation of device tree bindings for the STM32 SAI ASoC driver.
Signed-off-by: olivier moysan olivier.moysan@st.com
.../devicetree/bindings/sound/st,stm32-sai.txt | 89 ++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-sai.txt
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.txt b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt new file mode 100644 index 0000000..c59a3d7 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt @@ -0,0 +1,89 @@ +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"
- 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 "x8k" and "x11k"
- "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.
- clock-names: Must contain "sai_ck".
- dmas: see Documentation/devicetree/bindings/dma/stm32-dma.txt
- 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/pinctrl-stm32.txt
+Example: +sound_card {
- compatible = "audio-graph-card";
- dais = <&sai1b_port>;
+};
+sai1: sai1@40015800 {
- compatible = "st,stm32f4-sai";
- #address-cells = <1>;
- #size-cells = <1>;
- ranges;
It's preferred if this is not empty and it limited to the address range needed.
- reg = <0x40015800 0x4>;
- clocks = <&rcc 1 CLK_SAIQ_PDIV>, <&rcc 1 CLK_I2SQ_PDIV>;
- clock-names = "x8k", "x11k";
- interrupts = <87>;
- sai1b: audio-controller@40015824 {
#sound-dai-cells = <0>;compatible = "st,stm32-sai-sub-b";reg = <0x40015824 0x1C>;clocks = <&rcc 1 CLK_SAI2>;clock-names = "sai_ck";dmas = <&dma2 5 0 0x400 0x0>;dma-names = "tx";pinctrl-names = "default";pinctrl-0 = <&pinctrl_sai1b>;ports {#address-cells = <1>;#size-cells = <0>;sai1b_port: port@0 {
Need to document how many ports and endpoints.
reg = <0>;
For a single port, you don't need a reg prop.
cpu_endpoint: endpoint {remote-endpoint = <&codec_endpoint>;audio-graph-card,format = "i2s";audio-graph-card,bitclock-master = <&codec_endpoint>;audio-graph-card,frame-master = <&codec_endpoint>;
The prefix is gone now.
};};};- };
+};
+audio-codec {
- codec_port: port {
codec_endpoint: endpoint {remote-endpoint = <&cpu_endpoint>;};- };
+};
1.9.1