linux-kernel - [PATCH v3 3/3] ASoC: tlv320adcx140: Configure PDM sampling edge

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Date:   Thu, 14 May 2020 07:33:38 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Dan Murphy <dmurphy@...com>
Subject: [PATCH v3 3/3] ASoC: tlv320adcx140: Configure PDM sampling edge

Configure the PDM sampling edges based on the values from the firmware.

Signed-off-by: Dan Murphy <dmurphy@...com>
---
 sound/soc/codecs/tlv320adcx140.c | 22 ++++++++++++++++++++++
 sound/soc/codecs/tlv320adcx140.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index 97634e0ca0ba..140a5802a9a9 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -760,6 +760,10 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 	int sleep_cfg_val = ADCX140_WAKE_DEV;
 	u8 bias_source;
 	u8 vref_source;
+	int pdm_count;
+	u32 pdm_edges[ADCX140_NUM_PDM_EDGES];
+	u32 pdm_edge_val = 0;
+	int i;
 	int ret;
 
 	ret = device_property_read_u8(adcx140->dev, "ti,mic-bias-source",
@@ -786,6 +790,24 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 
 	bias_source |= vref_source;
 
+	pdm_count = device_property_count_u32(adcx140->dev,
+					      "ti,pdm-edge-select");
+	if (pdm_count <= ADCX140_NUM_PDM_EDGES && pdm_count > 0) {
+		ret = device_property_read_u32_array(adcx140->dev,
+						     "ti,pdm-edge-select",
+						     pdm_edges, pdm_count);
+		if (ret)
+			return ret;
+
+		for (i = 0; i < pdm_count; i++)
+			pdm_edge_val |= pdm_edges[i] << (ADCX140_PDM_EDGE_SHIFT - i);
+
+		ret = regmap_write(adcx140->regmap, ADCX140_PDM_CFG,
+				   pdm_edge_val);
+		if (ret)
+			return ret;
+	}
+
 	ret = adcx140_reset(adcx140);
 	if (ret)
 		goto out;
diff --git a/sound/soc/codecs/tlv320adcx140.h b/sound/soc/codecs/tlv320adcx140.h
index 6d055e55909e..432eaf25d1a7 100644
--- a/sound/soc/codecs/tlv320adcx140.h
+++ b/sound/soc/codecs/tlv320adcx140.h
@@ -128,4 +128,7 @@
 
 #define ADCX140_TX_OFFSET_MASK		GENMASK(4, 0)
 
+#define ADCX140_NUM_PDM_EDGES		4
+#define ADCX140_PDM_EDGE_SHIFT		7
+
 #endif /* _TLV320ADCX140_ */
-- 
2.26.2