ASoC: samsung: Add DT bindings documentation for TM2 sound subsystem

This patch adds DT binding documentation for Exnos5433 based TM2
and TM2E boards sound subsystem.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt b/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt
new file mode 100644 (file)
index 0000000..94442e5
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/samsung,tm2-audio.txt
@@ -0,0 +1,38 @@
+Samsung Exynos5433 TM2(E) audio complex with WM5110 codec
+
+Required properties:
+
+ - compatible           : "samsung,tm2-audio"
+ - model                : the user-visible name of this sound complex
+ - audio-codec          : the phandle of the wm5110 audio codec node,
+                          as described in ../mfd/arizona.txt
+ - i2s-controller       : the phandle of the I2S controller
+ - audio-amplifier      : the phandle of the MAX98504 amplifier
+ - samsung,audio-routing : a list of the connections between audio components;
+                          each entry is a pair of strings, the first being the
+                          connection's sink, the second being the connection's
+                          source; valid names for sources and sinks are the
+                          WM5110's and MAX98504's pins and the jacks on the
+                          board: HP, SPK, Main Mic, Sub Mic, Third Mic,
+                          Headset Mic
+ - mic-bias-gpios       : GPIO pin that enables the Main Mic bias regulator
+
+
+Example:
+
+sound {
+       compatible = "samsung,tm2-audio";
+       audio-codec = <&wm5110>;
+       i2s-controller = <&i2s0>;
+       audio-amplifier = <&max98504>;
+       mic-bias-gpios = <&gpr3 2 0>;
+       model = "wm5110";
+       samsung,audio-routing =
+               "HP", "HPOUT1L",
+               "HP", "HPOUT1R",
+               "SPK", "SPKOUT",
+               "SPKOUT", "HPOUT2L",
+               "SPKOUT", "HPOUT2R",
+               "Main Mic", "MICBIAS2",
+               "IN1R", "Main Mic";
+};