linux-kernel - [PATCH 10/11] ASoC: tlv320adcx140: add kcontrol for num biquads

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Message-Id: <20251217-sound-soc-codecs-tvl320adcx140-v1-10-293dea149d7b@pengutronix.de>
Date: Wed, 17 Dec 2025 14:55:00 +0100
From: Sascha Hauer <s.hauer@...gutronix.de>
To: Shenghao Ding <shenghao-ding@...com>, Kevin Lu <kevin-lu@...com>, 
 Baojun Xu <baojun.xu@...com>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Clark Williams <clrkwllms@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Andrew Davis <afd@...com>, 
 Dan Murphy <dmurphy@...com>
Cc: linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Kevin Lu <luminlong@....com>, linux-rt-devel@...ts.linux.dev, 
 devicetree@...r.kernel.org, Sascha Hauer <s.hauer@...gutronix.de>, 
 Emil-Juhl <emdj@...g-olufsen.dk>
Subject: [PATCH 10/11] ASoC: tlv320adcx140: add kcontrol for num biquads

From: Emil-Juhl <emdj@...g-olufsen.dk>

The tlv320adcx140 chips have a configurable amount of biquad filters
enabled per input channel. Currently this number is always left at the
default value of 2 biquads per channel.
This commit adds a kcontrol to allow runtime configuration of the amount
of biquads per channel.

The configuration is controlled by bits [5-6] in the DSP_CFG1 register.

Signed-off-by: Emil-Juhl <emdj@...g-olufsen.dk>
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 sound/soc/codecs/tlv320adcx140.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index a835074d9a7898466c6854f0c0e8ab687a99c57a..d8b6e6fafb68bc48ce9be01e2435bfecdb5bafc8 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -719,6 +719,8 @@ static const struct snd_kcontrol_new adcx140_snd_controls[] = {
 	SOC_SINGLE("CH8_ASI_Slot", ADCX140_ASI_CH8,	0, 0x3f, 0),
 
 	ADCX140_PHASE_CALIB_SWITCH("Phase Calibration Switch"),
+
+	SOC_SINGLE("Biquads Per Channel", ADCX140_DSP_CFG1, 5, 3, 0),
 };
 
 static int adcx140_reset(struct adcx140_priv *adcx140)

-- 
2.47.3