diff --git a/include/sound/cs35l56.h b/include/sound/cs35l56.h
index 45a5df574aa6..747e10ec1a27 100644
--- a/include/sound/cs35l56.h
+++ b/include/sound/cs35l56.h
@@ -312,6 +312,7 @@ struct snd_ctl_elem_value;
 
 #define CS35L56_SDW1_PLAYBACK_PORT			1
 #define CS35L56_SDW1_CAPTURE_PORT			3
+#define CS35L56_OT25_CAPTURE_PORT			4
 
 #define CS35L56_NUM_BULK_SUPPLIES			3
 #define CS35L56_NUM_DSP_REGIONS				5
diff --git a/sound/soc/codecs/cs35l56-sdw.c b/sound/soc/codecs/cs35l56-sdw.c
index 98bb4542b914..e10f04d677f4 100644
--- a/sound/soc/codecs/cs35l56-sdw.c
+++ b/sound/soc/codecs/cs35l56-sdw.c
@@ -265,11 +265,11 @@ static int cs35l56_sdw_read_prop(struct sdw_slave *peripheral)
 	if (ret == 0)
 		prop->clk_stop_mode1 = !!clock_stop_1;
 
-	ports = devm_kcalloc(cs35l56->base.dev, 2, sizeof(*ports), GFP_KERNEL);
+	ports = devm_kcalloc(cs35l56->base.dev, 3, sizeof(*ports), GFP_KERNEL);
 	if (!ports)
 		return -ENOMEM;
 
-	prop->source_ports = BIT(CS35L56_SDW1_CAPTURE_PORT);
+	prop->source_ports = BIT(CS35L56_SDW1_CAPTURE_PORT) | BIT(CS35L56_OT25_CAPTURE_PORT);
 	prop->sink_ports = BIT(CS35L56_SDW1_PLAYBACK_PORT);
 	prop->paging_support = true;
 	prop->use_domain_irq = true;
@@ -286,6 +286,11 @@ static int cs35l56_sdw_read_prop(struct sdw_slave *peripheral)
 	ports[1].num = CS35L56_SDW1_CAPTURE_PORT;
 	ports[1].type = SDW_DPN_FULL;
 	ports[1].ch_prep_timeout = 10;
+
+	/* DP4 - capture */
+	ports[2].num = CS35L56_OT25_CAPTURE_PORT;
+	ports[2].type = SDW_DPN_FULL;
+	ports[2].ch_prep_timeout = 10;
 	prop->src_dpn_prop = &ports[1];
 
 	dev_dbg(&peripheral->dev, "clock stop mode 1 supported: %s\n",
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index 35d210626627..279db3f13f1e 100644
--- a/sound/soc/codecs/cs35l56.c
+++ b/sound/soc/codecs/cs35l56.c
@@ -32,6 +32,7 @@
 #include <sound/cs-amp-lib.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
+#include <sound/sdw.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/tlv.h>
@@ -324,6 +325,7 @@ static const struct snd_soc_dapm_widget cs35l56_dapm_widgets[] = {
 	SND_SOC_DAPM_SIGGEN("VDDBMON ADC"),
 	SND_SOC_DAPM_SIGGEN("VBSTMON ADC"),
 	SND_SOC_DAPM_SIGGEN("TEMPMON ADC"),
+	SND_SOC_DAPM_SIGGEN("OT25 Reference"),
 
 	SND_SOC_DAPM_INPUT("Calibrate"),
 };
@@ -388,6 +390,8 @@ static const struct snd_soc_dapm_route cs35l56_audio_map[] = {
 	{ "SDW1 Capture", NULL, "SDW1 TX2 Source" },
 	{ "SDW1 Capture", NULL, "SDW1 TX3 Source" },
 	{ "SDW1 Capture", NULL, "SDW1 TX4 Source" },
+
+	{ "OT25", NULL, "OT25 Reference" },
 };
 
 static int cs35l56_dsp_event(struct snd_soc_dapm_widget *w,
@@ -712,6 +716,37 @@ static int cs35l56_sdw_dai_set_stream(struct snd_soc_dai *dai,
 	return 0;
 }
 
+static int cs35l56_ot25_dai_hw_params(struct snd_pcm_substream *substream,
+				      struct snd_pcm_hw_params *params,
+				      struct snd_soc_dai *dai)
+{
+	struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(dai->component);
+	struct sdw_stream_runtime *sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
+	struct sdw_stream_config sconfig = { };
+	struct sdw_port_config pconfig = { };
+	int ret;
+
+	dev_dbg(cs35l56->base.dev, "%s: rate %d\n", __func__, params_rate(params));
+
+	if (!cs35l56->base.init_done)
+		return -ENODEV;
+
+	if (!sdw_stream)
+		return -EINVAL;
+
+	snd_sdw_params_to_config(substream, params, &sconfig, &pconfig);
+	pconfig.num = CS35L56_OT25_CAPTURE_PORT;
+
+	ret = sdw_stream_add_slave(cs35l56->sdw_peripheral, &sconfig, &pconfig,
+				   1, sdw_stream);
+	if (ret) {
+		dev_err(dai->dev, "Failed to add OT25 stream: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static const struct snd_soc_dai_ops cs35l56_sdw_dai_ops = {
 	.set_tdm_slot = cs35l56_sdw_dai_set_tdm_slot,
 	.shutdown = cs35l56_sdw_dai_shutdown,
@@ -720,6 +755,13 @@ static const struct snd_soc_dai_ops cs35l56_sdw_dai_ops = {
 	.set_stream = cs35l56_sdw_dai_set_stream,
 };
 
+static const struct snd_soc_dai_ops cs35l56_ot25_dai_ops = {
+	.shutdown = cs35l56_sdw_dai_shutdown,
+	.hw_params = cs35l56_ot25_dai_hw_params,
+	.hw_free = cs35l56_sdw_dai_hw_free,
+	.set_stream = cs35l56_sdw_dai_set_stream,
+};
+
 static struct snd_soc_dai_driver cs35l56_dai[] = {
 	{
 		.name = "cs35l56-asp1",
@@ -768,6 +810,18 @@ static struct snd_soc_dai_driver cs35l56_dai[] = {
 		.symmetric_rate = 1,
 		.ops = &cs35l56_sdw_dai_ops,
 	},
+	{
+		.name = "cs35l56-ot25",
+		.id = 3,
+		.capture = {
+			.stream_name = "OT25",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = CS35L56_RATES,
+			.formats = CS35L56_TX_FORMATS,
+		},
+		.ops = &cs35l56_ot25_dai_ops,
+	},
 };
 
 static int cs35l56_write_cal(struct cs35l56_private *cs35l56)