ASoC: dt-binding: Add bindings for Allwinner A64 codec's analog path controls

The internal codec on Allwinner A64 is split into 2 parts. The
analog path controls are routed through an embedded custom register
bus accessed through the PRCM block just as on A23/A33/H3.

Add a binding for this hardware.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/sun50i-codec-analog.txt b/Documentation/devicetree/bindings/sound/sun50i-codec-analog.txt
new file mode 100644 (file)
index 0000000..4f8ad0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/sun50i-codec-analog.txt
@@ -0,0 +1,12 @@
+* Allwinner A64 Codec Analog Controls
+
+Required properties:
+- compatible: must be one of the following compatibles:
+               - "allwinner,sun50i-a64-codec-analog"
+- reg: must contain the registers location and length
+
+Example:
+       codec_analog: codec-analog@1f015c0 {
+               compatible = "allwinner,sun50i-a64-codec-analog";
+               reg = <0x01f015c0 0x4>;
+       };