linux-kernel - [PATCH v2 1/2] ASoC: mediatek: mt6358: support DMIC one-wire mode

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Date:   Fri, 5 Jun 2020 18:33:41 +0800
From:   Jiaxin Yu <jiaxin.yu@...iatek.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <tiwai@...e.com>,
        <matthias.bgg@...il.com>, <hariprasad.kelam@...il.com>
CC:     <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <howie.huang@...iatek.com>,
        <tzungbi@...gle.com>, Jiaxin Yu <jiaxin.yu@...iatek.com>
Subject: [PATCH v2 1/2] ASoC: mediatek: mt6358: support DMIC one-wire mode

Supports DMIC one-wire mode. Uses a DT property "dmic-mode" to select.

Signed-off-by: Jiaxin Yu <jiaxin.yu@...iatek.com>
---
 sound/soc/codecs/mt6358.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/mt6358.c b/sound/soc/codecs/mt6358.c
index 1b830ea..1f39d59 100644
--- a/sound/soc/codecs/mt6358.c
+++ b/sound/soc/codecs/mt6358.c
@@ -95,6 +95,8 @@ struct mt6358_priv {
 	struct regulator *avdd_reg;
 
 	int wov_enabled;
+
+	unsigned int dmic_one_wire_mode;
 };
 
 int mt6358_set_mtkaif_protocol(struct snd_soc_component *cmpnt,
@@ -1831,7 +1833,10 @@ static int mt6358_dmic_enable(struct mt6358_priv *priv)
 	mt6358_mtkaif_tx_enable(priv);
 
 	/* UL dmic setting */
-	regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_H, 0x0080);
+	if (priv->dmic_one_wire_mode)
+		regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_H, 0x0400);
+	else
+		regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_H, 0x0080);
 
 	/* UL turn on */
 	regmap_write(priv->regmap, MT6358_AFE_UL_SRC_CON0_L, 0x0003);
@@ -2426,6 +2431,20 @@ static int mt6358_codec_probe(struct snd_soc_component *cmpnt)
 	.num_dapm_routes = ARRAY_SIZE(mt6358_dapm_routes),
 };
 
+static void mt6358_parse_dt(struct mt6358_priv *priv)
+{
+	int ret;
+	struct device *dev = priv->dev;
+
+	ret = of_property_read_u32(dev->of_node, "mediatek,dmic-mode",
+				   &priv->dmic_one_wire_mode);
+	if (ret) {
+		dev_warn(priv->dev, "%s() failed to read dmic-mode\n",
+			 __func__);
+		priv->dmic_one_wire_mode = 0;
+	}
+}
+
 static int mt6358_platform_driver_probe(struct platform_device *pdev)
 {
 	struct mt6358_priv *priv;
@@ -2445,6 +2464,8 @@ static int mt6358_platform_driver_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);
 
+	mt6358_parse_dt(priv);
+
 	dev_info(priv->dev, "%s(), dev name %s\n",
 		 __func__, dev_name(&pdev->dev));
 
-- 
1.8.1.1.dirty