From 24e0b04dd42be34ec4b18dc1a1e139d66eb572a3 Mon Sep 17 00:00:00 2001 From: Arnaud Ferraris <arnaud.ferraris@collabora.com> Date: Mon, 20 Jun 2022 22:54:50 -0500 Subject: 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> --- .../devicetree/bindings/sound/allwinner,sun50i-a64-codec-analog.yaml | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'Documentation') 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 -- cgit v1.2.3