linux-kernel - [PATCH v3 2/3] ASoC: dt-bindings: sama7g5-pdmc: add microchip,startup-delay-us binding

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Date:   Tue, 28 Feb 2023 13:01:44 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>
CC:     <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v3 2/3] ASoC: dt-bindings: sama7g5-pdmc: add microchip,startup-delay-us binding

PDMC can work with different types of microphones, thus different boards
could have different microphones. Depending on microphone type the PDMC
would need to wait longer or shorter period (at startup) than the default
chosen one to filter unwanted noise. Thus add microchip,startup-delay-us
binding to let PDMC users to specify startup delay.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 .../devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml b/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml
index c4cf1e5ab84b..9b40268537cb 100644
--- a/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml
+++ b/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml
@@ -67,6 +67,12 @@ properties:
     maxItems: 4
     uniqueItems: true
 
+  microchip,startup-delay-us:
+    description: |
+      Specifies the delay in microseconds that needs to be applied after
+      enabling the PDMC microphones to avoid unwanted noise due to microphones
+      not being ready.
+
 required:
   - compatible
   - reg
-- 
2.34.1