linux-kernel - [PATCH 4/6] ASoC: tlv320adcx140: Add the config to configure Tx ASI output

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Date:   Tue, 15 Sep 2020 14:06:04 -0500
From:   Dan Murphy <dmurphy@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <tiwai@...e.com>,
        <robh+dt@...nel.org>
CC:     <devicetree@...r.kernel.org>, <camel.guo@...s.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Dan Murphy <dmurphy@...com>
Subject: [PATCH 4/6] ASoC: tlv320adcx140: Add the config to configure Tx ASI output

Add code to allow the ASI Tx output to be placed into High-z mode
during unused ASI cycles.  This allows for other devices that may be on
the bus to drive the ASI out. By default the 320adcx140 sends 0's for
unused cycles.

Signed-off-by: Dan Murphy <dmurphy@...com>
---
 sound/soc/codecs/tlv320adcx140.c | 11 +++++++++++
 sound/soc/codecs/tlv320adcx140.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index 73d18e8002e4..7fa5c8682c51 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -839,6 +839,7 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 	u32 gpi_input_val = 0;
 	int i;
 	int ret;
+	bool tx_high_z;
 
 	ret = device_property_read_u32(adcx140->dev, "ti,mic-bias-source",
 				      &bias_source);
@@ -930,6 +931,16 @@ static int adcx140_codec_probe(struct snd_soc_component *component)
 	if (ret)
 		dev_err(adcx140->dev, "setting MIC bias failed %d\n", ret);
 
+	tx_high_z = device_property_read_bool(adcx140->dev, "ti,asi-tx-drive");
+	if (tx_high_z) {
+		ret = regmap_update_bits(adcx140->regmap, ADCX140_ASI_CFG0,
+				 ADCX140_TX_FILL, ADCX140_TX_FILL);
+		if (ret) {
+			dev_err(adcx140->dev, "Setting Tx drive failed %d\n", ret);
+			goto out;
+		}
+	}
+
 	adcx140_pwr_ctrl(adcx140, true);
 out:
 	return ret;
diff --git a/sound/soc/codecs/tlv320adcx140.h b/sound/soc/codecs/tlv320adcx140.h
index 94c6d1fd2977..107bd7927d9c 100644
--- a/sound/soc/codecs/tlv320adcx140.h
+++ b/sound/soc/codecs/tlv320adcx140.h
@@ -146,5 +146,6 @@
 #define ADCX140_GPO_CFG_MAX		4
 #define ADCX140_GPO_DRV_MAX		5
 
+#define ADCX140_TX_FILL    BIT(0)
 
 #endif /* _TLV320ADCX140_ */
-- 
2.28.0