This adds documentation of device tree bindings for the
STM32 SPDIFRX interface.
Signed-off-by: olivier moysan <olivier.moysan@xxxxxx>
---
.../devicetree/bindings/sound/st,stm32-spdifrx.txt | 56 ++++++++++++++++++++++
1 file changed, 56 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/st,stm32-spdifrx.txt
diff --git a/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.txt b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.txt
new file mode 100644
index 0000000..33826f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/st,stm32-spdifrx.txt
@@ -0,0 +1,56 @@
+STMicroelectronics STM32 S/PDIF receiver (SPDIFRX).
+
+The SPDIFRX peripheral, is designed to receive an S/PDIF flow compliant with
+IEC-60958 and IEC-61937.
+
+Required properties:
+ - compatible: should be "st,stm32h7-spdifrx"
+ - reg: cpu DAI IP base address and size
+ - clocks: must contain an entry for kclk (used as S/PDIF signal reference)
+ - clock-names: must contain "kclk"
+ - interrupts: cpu DAI interrupt line
+ - dmas: DMA specifiers for audio data DMA and iec control flow DMA
+ See STM32 DMA bindings, Documentation/devicetree/bindings/dma/stm32-dma.txt
+ - dma-names: two dmas have to be defined, "rx" and "rx-ctrl"
+
+Optional properties:
+ - resets: Reference to a reset controller asserting the SPDIFRX
+
+The device node should contain one 'port' child node with one child 'endpoint'
+node, according to the bindings defined in Documentation/devicetree/bindings/
+graph.txt.
+
+Example:
+spdifrx: spdifrx@40004000 {
+ compatible = "st,stm32h7-spdifrx";
+ reg = <0x40004000 0x400>;
+ clocks = <&rcc SPDIFRX_CK>;
+ clock-names = "kclk";
+ interrupts = <97>;
+ dmas = <&dmamux1 2 93 0x400 0x0>,
+ <&dmamux1 3 94 0x400 0x0>;
+ dma-names = "rx", "rx-ctrl";
+ pinctrl-0 = <&spdifrx_pins>;
+ pinctrl-names = "default";
+
+ spdifrx_port: port {
+ cpu_endpoint: endpoint {
+ remote-endpoint = <&codec_endpoint>;
+ };
+ };
+};
+
+spdif_in: spdif-in {
+ compatible = "linux,spdif-dir";
+
+ codec_port: port {
+ codec_endpoint: endpoint {
+ remote-endpoint = <&cpu_endpoint>;
+ };
+ };
+};
+
+soundcard {
+ compatible = "audio-graph-card";
+ dais = <&spdifrx_port>;
+};
--
1.9.1
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