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

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Message-Id: <20220616062554.57266-2-samuel@sholland.org>
Date:   Thu, 16 Jun 2022 01:25:52 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Samuel Holland <samuel@...lland.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH 1/3] ASoC: dt-bindings: sun50i-codec: Add binding for internal bias

From: Arnaud Ferraris <arnaud.ferraris@...labora.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@...labora.com>
[Samuel: split binding and implementation patches]
Signed-off-by: Samuel Holland <samuel@...lland.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
-- 
2.35.1