linux-kernel - [PATCH 1/3] ASoC: dt-bindings: nau8821: Add delay control for ADC

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Date: Fri, 12 Apr 2024 18:35:52 +0800
From: Seven Lee <wtli@...oton.com>
To: <broonie@...nel.org>
CC: <lgirdwood@...il.com>, <alsa-devel@...a-project.org>,
	<devicetree@...r.kernel.org>, <linux-sound@...r.kernel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <linux-kernel@...r.kernel.org>,
	<robh+dt@...nel.org>, <conor+dt@...nel.org>, <perex@...ex.cz>,
	<tiwai@...e.com>, <YHCHuang@...oton.com>, <KCHSU0@...oton.com>,
	<CTLIN0@...oton.com>, <SJLIN0@...oton.com>, <wtli@...oton.com>,
	<scott6986@...il.com>, <supercraig0719@...il.com>, <dardar923@...il.com>,
	<edson.drosdeck@...il.com>, <u.kleine-koenig@...gutronix.de>
Subject: [PATCH 1/3] ASoC: dt-bindings: nau8821: Add delay control for ADC

Change the original fixed delay to the assignment from the property. It
will make it more flexible to different platforms to avoid pop noise at
the beginning of recording.

Signed-off-by: Seven Lee <wtli@...oton.com>
---
 .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
index 054b53954ac3..a726c5a9b067 100644
--- a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
+++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
@@ -103,6 +103,13 @@ properties:
         just limited to the left adc for design demand.
     type: boolean
 
+  nuvoton,adc-delay-ms:
+    description: Delay (in ms) to make input path stable and avoid pop noise.
+        The default value is 125 and range between 125 to 500 ms.
+    minimum: 125
+    maximum: 500
+    default: 125
+
   '#sound-dai-cells':
     const: 0
 
@@ -136,6 +143,7 @@ examples:
             nuvoton,jack-eject-debounce = <0>;
             nuvoton,dmic-clk-threshold = <3072000>;
             nuvoton,dmic-slew-rate = <0>;
+            nuvoton,nuvoton,adc-delay-ms = <125>;
             #sound-dai-cells = <0>;
         };
     };
-- 
2.25.1