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Subject[PATCH 1/3] ARM: dts: Correct audio input route & set mic bias
Date
From: Adam YH Lee <adam.yh.lee@gmail.com>

Audio-in was incorrectly routed to Line In. It should be Mic3L as per
schematic.

Using mic-bias voltage at 2.0v (<0x1>) does not work for some reason. There
is no voltage seen on micbias (R127). Mic-bias voltage of 2.5v (<0x2>) works.
I see voltage of 2.475v across GND and micbias.

With these changes, I can record audio with a pair of proliferate TRRS earbuds.

Signed-off-by: Ash Charles <ashcharles@gmail.com>
---
arch/arm/boot/dts/am335x-pepper.dts | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/am335x-pepper.dts b/arch/arm/boot/dts/am335x-pepper.dts
index 0d35ab6..473d8ee 100644
--- a/arch/arm/boot/dts/am335x-pepper.dts
+++ b/arch/arm/boot/dts/am335x-pepper.dts
@@ -74,6 +74,7 @@
audio_codec: tlv320aic3106@1b {
compatible = "ti,tlv320aic3106";
reg = <0x1b>;
+ ai3x-micbias-vg = <0x2>;
};

accel: lis331dlh@1d {
@@ -153,7 +154,7 @@
ti,audio-routing =
"Headphone Jack", "HPLOUT",
"Headphone Jack", "HPROUT",
- "LINE1L", "Line In";
+ "MIC3L", "Mic3L Switch";
};

&mcasp0 {
--
2.1.4


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