From: Arnaud Ferraris arnaud.ferraris@collabora.com
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 ---
.../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