On Thu, Apr 06, 2017 at 05:40:35PM +0200, olivier moysan wrote:
Add documentation of device tree bindings for STM32 SPI/I2S.
Signed-off-by: olivier moysan olivier.moysan@st.com
.../devicetree/bindings/sound/st,stm32h7-i2s.txt | 71 ++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/st,stm32h7-i2s.txt
diff --git a/Documentation/devicetree/bindings/sound/st,stm32h7-i2s.txt b/Documentation/devicetree/bindings/sound/st,stm32h7-i2s.txt new file mode 100644 index 0000000..b99467a --- /dev/null +++ b/Documentation/devicetree/bindings/sound/st,stm32h7-i2s.txt @@ -0,0 +1,71 @@ +STMicroelectronics STM32 SPI/I2S Controller
+The SPI/I2S block supports I2S/PCM protocols when configured on I2S mode. +Only some SPI instances support I2S.
+Required properties:
- compatible: Must be "st,stm32h7-i2s"
- #sound-dai-cells: Must be 1. (one parameter)
- This parameter allows to specify CPU DAI index in soundcard CPU dai link.
- index 0: playback DAI
- index 1: capture DAI
- index 2: full duplex DAI
Is this still needed for graph-card?
- reg: Offset and length of the device's register set.
- interrupts: Must contain the interrupt line id.
- clocks: Must contain phandle and clock specifier pairs for each entry
- in clock-names.
- clock-names: Must contain "i2sclk", "pclk", "x8k" and "x11k".
- "i2sclk": clock which feeds the internal clock generator
- "pclk": clock which feeds the peripheral bus interface
- "x8k": I2S parent clock for sampling rates multiple of 8kHz.
- "x11k": I2S parent clock for sampling rates multiple of 11.025kHz.
- dmas: DMA specifiers for tx and rx dma.
- See Documentation/devicetree/bindings/dma/stm32-dma.txt.
- dma-names: Identifier for each DMA request line. Must be "tx" and "rx".
- pinctrl-names: should contain only value "default"
- pinctrl-0: see Documentation/devicetree/bindings/pinctrl/pinctrl-stm32.txt
+Optional properties:
- resets: Reference to a reset controller asserting the reset controller
+Example: +sound_card {
- compatible = "audio-graph-card";
- dais = <&i2s2_port 0>;
+};
+i2s2: audio-controller@40003800 {
- compatible = "st,stm32h7-i2s";
- #sound-dai-cells = <1>;
- reg = <0x40003800 0x400>;
- interrupts = <36>;
- clocks = <&rcc PCLK1>, <&rcc SPI2_CK>, <&rcc PLL1_Q>, <&rcc PLL2_P>;
- clock-names = "pclk", "i2sclk", "x8k", "x11k";
- dmas = <&dmamux2 2 39 0x400 0x1>,
<&dmamux2 3 40 0x400 0x1>;- dma-names = "rx", "tx";
- pinctrl-names = "default";
- pinctrl-0 = <&pinctrl_i2s2>;
- ports {
#address-cells = <1>;#size-cells = <0>;i2s2_port: port@0 {reg = <0>;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 'audio-graph-card,' part has been dropped.
};};+};
+audio-codec {
codec_port: port {codec_endpoint: endpoint {remote-endpoint = <&cpu_endpoint>;};- };
+};
1.9.1