From: Arnaud Ferraris <arnaud.ferraris@xxxxxxxxxxxxx>
In order to properly bias headset microphones, there should be a pull-up
resistor between pins HBIAS and MIC2P. This can be an external resistor,
but the codec also provides an internal 2.2K resistor which is enabled
by a register.
This patch adds a device-tree property to the sun50i-codec-analog driver
to take advantage of this feature.
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@xxxxxxxxxxxxx>
[Samuel: split binding and implementation patches]
Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
(no changes since v1)
.../bindings/sound/allwinner,sun50i-a64-codec-analog.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml b/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
index 3b764415c9ab..66859eb8f79a 100644
--- a/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
+++ b/Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
@@ -21,6 +21,11 @@ properties:
description:
Regulator for the headphone amplifier
+ allwinner,internal-bias-resistor:
+ description:
+ Enable the internal 2.2K bias resistor between HBIAS and MICDET pins
+ type: boolean
+
required:
- compatible
- reg
--
2.35.1
