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ASoC: dt-bindings: sun50i-codec: Add binding for internal bias 

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@collabora.com>
[Samuel: split binding and implementation patches]
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220621035452.60272-2-samuel@sholland.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Arnaud Ferraris 2022-06-20 22:54:50 -05:00 committed by Mark Brown
parent 658e959530
commit 24e0b04dd4
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GPG Key ID: 24D68B725D5487D0
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5
Documentation/devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml
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@ -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