ASoC: add TI ts3a227e headset chip driver

The TS3A227E is an autonomous audio accessory detection and
configuration switch that detects 3-pole or 4-pole audio accessories
and configures internal switches to route the signals accordingly.

This chip also has built-in support for the new button standard
described in the Android "Wired audio headset specification" v1.0.
These buttons will be reported on the jack as buttons 0-3 mapped to
KEY_MEDIA, KEY_VOLUMEUP, KEY_VOLUMEDOWN, and KEY_VOICE_COMMAND.

This will be added as an aux_dev and have the jack passed in from the
machine driver.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/ts3a227e.txt b/Documentation/devicetree/bindings/sound/ts3a227e.txt
new file mode 100644
index 000000000000..e8bf23eb1803
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ts3a227e.txt
@@ -0,0 +1,26 @@
+Texas Instruments TS3A227E
+Autonomous Audio Accessory Detection and Configuration Switch
+
+The TS3A227E detect headsets of 3-ring and 4-ring standards and
+switches automatically to route the microphone correctly.  It also
+handles key press detection in accordance with the Android audio
+headset specification v1.0.
+
+Required properties:
+
+ - compatible:		Should contain "ti,ts3a227e".
+ - reg:			The i2c address. Should contain <0x3b>.
+ - interrupt-parent:	The parent interrupt controller
+ - interrupts:		Interrupt number for /INT pin from the 227e
+
+
+Examples:
+
+	i2c {
+		ts3a227e@3b {
+			compatible = "ti,ts3a227e";
+			reg = <0x3b>;
+			interrupt-parent = <&gpio>;
+			interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+		};
+	};