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@st.com
.../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