On Tue, Mar 07, 2017 at 10:44:31AM +0100, olivier moysan wrote:
> This patch adds documentation of device tree bindings for the
> STM32 SAI ASoC driver.
>
> Signed-off-by: olivier moysan <olivier.moysan@xxxxxx>
> ---
> .../devicetree/bindings/sound/st,stm32-sai.txt | 79 ++++++++++++++++++++++
> 1 file changed, 79 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..b3be26d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.txt
> @@ -0,0 +1,79 @@
> +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 "clk_x8k" and "clk_x11k"
> + "clk_x8k": SAI parent clock for sampling rates multiple of 8kHz.
> + "clk_x11k": SAI parent clock for sampling rates multiple of 11.025kHz.
clk_ is redundant.
> + - interrupts: cpu DAI interrupt line shared by SAI sub-blocks
> +
> +Note: Each SAI controller should have an alias correctly numbered
> +in "aliases" node, to provide explicit name to CPU DAI.
No, it shouldn't. Why do you need that?
> +
> +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:
> +sai1: sai1@40015800 {
> + compatible = "st,stm32f4-sai";
> + reg = <0x40015800 0x400>;
> + clocks = <&rcc 1 CLK_SAIQ_PDIV>, <&rcc 1 CLK_I2SQ_PDIV>;
> + clock-names = "clk_x8k", "clk_x11k";
> + interrupts = <87>;
> + resets = <&rcc 310>;
> +
> + sai1b: sai@1 {
unit address needs a reg property.
audio-controller@1
> + #sound-dai-cells = <0>;
> + compatible = "st,stm32-sai-sub-b";
> + clocks = <&rcc 1 CLK_SAI2>;
> + clock-names = "sai_ck";
> + dmas = <&dma2 5 0 0x400 0x1>;
> + dma-names = "tx";
> + };
> +};
> +
> +sound {
> + compatible = "simple-audio-card";
Perhaps you want to use the graph-card here. It's getting close to
merging.
> + simple-audio-card,name = "STM32-Sound-Card";
> + status = "okay";
> +
> + simple-audio-card,dai-link@0 {
> + format = "i2s";
> + cpu {
> + sound-dai = <&sai1b>;
> + };
> + codec {
> + sound-dai = <&codec>;
> + };
> + };
> +};
> +
> +aliases {
> + sai1 = &sai1;
> +};
> --
> 1.9.1
>
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