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[1/3] ASoC: dt-bindings: sun50i-codec: Add binding for internal bias

Message ID 20220616062554.57266-2-samuel@sholland.org (mailing list archive)
State Superseded
Headers show
Series ASoC: sun50i-codec-analog: Internal bias support | expand

Commit Message

Samuel Holland June 16, 2022, 6:25 a.m. UTC 
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 mbox series

Patch

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