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@mediatek.com>
Link: https://lore.kernel.org/r/1591353222-18576-2-git-send-email-jiaxin.yu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

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,
@@ -1831,6 +1833,9 @@ static int mt6358_dmic_enable(struct mt6358_priv *priv)
 	mt6358_mtkaif_tx_enable(priv);
 
 	/* UL dmic setting */
+	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 */
@@ -2426,6 +2431,20 @@ static const struct snd_soc_component_driver mt6358_soc_component_driver = {
 	.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));