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@xxxxxx> > --- > .../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 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html