linux-kernel - [PATCH v2 10/10] ASoC: tlv320adcx140: add channel sum control

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Message-Id: <20251218-sound-soc-codecs-tvl320adcx140-v2-10-3c2270c34bac@pengutronix.de>
Date: Thu, 18 Dec 2025 16:04:16 +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 Svendsen <emas@...g-olufsen.dk>
Subject: [PATCH v2 10/10] ASoC: tlv320adcx140: add channel sum control

From: Emil Svendsen <emas@...g-olufsen.dk>

Add control for channel summation.

3 modes are supported:

1. "Disabled": Normal operation

2. "2 Channel": Every two channels are summed and divided by 2

  Out 1 <- (CH1 + CH2) / 2
  Out 2 <- (CH1 + CH2) / 2
  Out 3 <- (CH3 + CH4) / 2
  Out 4 <- (CH3 + CH4) / 2

3. "4 Channel": Every four channels are summed and divided by 4

  Out 1 <- (CH1 + CH2 + CH3 + CH4) / 4
  Out 2 <- (CH1 + CH2 + CH3 + CH4) / 4
  Out 3 <- (CH1 + CH2 + CH3 + CH4) / 4
  Out 4 <- (CH1 + CH2 + CH3 + CH4) / 4

Signed-off-by: Emil Svendsen <emas@...g-olufsen.dk>
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 sound/soc/codecs/tlv320adcx140.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index e7c607af642f43b2b783597f3cba3a8cbb31de4a..ac6aab8d722409b2c47b4e1df2a23760bebe795b 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -222,6 +222,13 @@ static const struct snd_kcontrol_new decimation_filter_controls[] = {
 	SOC_DAPM_ENUM("Decimation Filter", decimation_filter_enum),
 };
 
+static const char * const channel_summation_text[] = {
+	"Disabled", "2 Channel", "4 Channel"
+};
+
+static SOC_ENUM_SINGLE_DECL(channel_summation_enum, ADCX140_DSP_CFG0, 2,
+			    channel_summation_text);
+
 static const char * const pdmclk_text[] = {
 	"2.8224 MHz", "1.4112 MHz", "705.6 kHz", "5.6448 MHz"
 };
@@ -711,6 +718,8 @@ static const struct snd_kcontrol_new adcx140_snd_controls[] = {
 	ADCX140_PHASE_CALIB_SWITCH("Phase Calibration Switch"),
 
 	SOC_SINGLE("Biquads Per Channel", ADCX140_DSP_CFG1, 5, 3, 0),
+
+	SOC_ENUM("Channel Summation", channel_summation_enum),
 };
 
 static int adcx140_reset(struct adcx140_priv *adcx140)

-- 
2.47.3