From 82bfb165902cd86d56517ffb90fdeeffafdde6de Mon Sep 17 00:00:00 2001 From: Arnaud Ferraris Date: Sun, 20 Sep 2020 20:26:36 -0500 Subject: [PATCH 394/478] ASoC: dt-bindings: sun50i-codec: Add binding for internal bias In order to properly bias headset microphones, there should be a resistor between pins HBIAS and MICDET. This can be an external resistor, but the codec also provides an internal 2.2K resistor which can be 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 [Samuel: split binding and implementation patches] Signed-off-by: Samuel Holland --- .../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 -- 2.35.3