ASoC: msm8x10: Parse the micbias internal property

Micbias can be either internal to the codec or external onboard pull up
resistor. Parse the property from device tree to setup the micbias
appropriately.

CRs-fixed: 539445
Change-Id: I2281b9b98a00d3d4cbfb98f912eaa41274a6c8ee
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>
diff --git a/Documentation/devicetree/bindings/sound/qcom-audio-dev.txt b/Documentation/devicetree/bindings/sound/qcom-audio-dev.txt
index 6e4f7fc..5e686a4f 100644
--- a/Documentation/devicetree/bindings/sound/qcom-audio-dev.txt
+++ b/Documentation/devicetree/bindings/sound/qcom-audio-dev.txt
@@ -436,6 +436,8 @@
 - qcom,headset-jack-type-NO: Adjust GPIO level based on the headset jack type.
 - qcom,tapan-codec-9302: Indicates that this device node is for WCD9302 audio
 			    codec.
+- qcom,mbhc-bias-internal: Flag to indicate if internal micbias should be used
+			   for headset detection.
 
 * APQ8074 ASoC Machine driver