ASoC: rt5682s: Add LDO output selection for dacref

Add LDO output selection for dacref.
Signed-off-by: Jack Yu <jack.yu@realtek.com>
Link: https://lore.kernel.org/r/62cad4e51c044108bad872ab349e36f8@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/rt5682s.h

@@ -31,6 +31,13 @@ enum rt5682s_dai_clks {
 	RT5682S_DAI_NUM_CLKS,
 };
 
+enum {
+	RT5682S_LDO_1_607V,
+	RT5682S_LDO_1_5V,
+	RT5682S_LDO_1_406V,
+	RT5682S_LDO_1_731V,
+};
+
 struct rt5682s_platform_data {
 	enum rt5682s_dmic1_data_pin dmic1_data_pin;
 	enum rt5682s_dmic1_clk_pin dmic1_clk_pin;
@@ -38,6 +45,7 @@ struct rt5682s_platform_data {
 	unsigned int dmic_clk_rate;
 	unsigned int dmic_delay;
 	unsigned int amic_delay;
+	unsigned int ldo_dacref;
 	bool dmic_clk_driving_high;
 
 	const char *dai_clk_names[RT5682S_DAI_NUM_CLKS];

sound/soc/codecs/rt5682s.c

@@ -2971,6 +2971,8 @@ static int rt5682s_parse_dt(struct rt5682s_priv *rt5682s, struct device *dev)
 		&rt5682s->pdata.dmic_delay);
 	device_property_read_u32(dev, "realtek,amic-delay-ms",
 		&rt5682s->pdata.amic_delay);
+	device_property_read_u32(dev, "realtek,ldo-sel",
+		&rt5682s->pdata.ldo_dacref);
 
 	if (device_property_read_string_array(dev, "clock-output-names",
 					      rt5682s->pdata.dai_clk_names,
@@ -3250,6 +3252,27 @@ static int rt5682s_i2c_probe(struct i2c_client *i2c)
 		break;
 	}
 
+	/* LDO output voltage control */
+	switch (rt5682s->pdata.ldo_dacref) {
+	case RT5682S_LDO_1_607V:
+		break;
+	case RT5682S_LDO_1_5V:
+		regmap_update_bits(rt5682s->regmap, RT5682S_BIAS_CUR_CTRL_7,
+			RT5682S_LDO_DACREF_MASK, RT5682S_LDO_DACREF_1_5V);
+		break;
+	case RT5682S_LDO_1_406V:
+		regmap_update_bits(rt5682s->regmap, RT5682S_BIAS_CUR_CTRL_7,
+			RT5682S_LDO_DACREF_MASK, RT5682S_LDO_DACREF_1_406V);
+		break;
+	case RT5682S_LDO_1_731V:
+		regmap_update_bits(rt5682s->regmap, RT5682S_BIAS_CUR_CTRL_7,
+			RT5682S_LDO_DACREF_MASK, RT5682S_LDO_DACREF_1_731V);
+		break;
+	default:
+		dev_warn(&i2c->dev, "invalid LDO output setting.\n");
+		break;
+	}
+
 	INIT_DELAYED_WORK(&rt5682s->jack_detect_work, rt5682s_jack_detect_handler);
 	INIT_DELAYED_WORK(&rt5682s->jd_check_work, rt5682s_jd_check_handler);
 

sound/soc/codecs/rt5682s.h

@@ -1263,6 +1263,13 @@
 #define RT5682S_JDH_NO_PLUG			(0x1 << 4)
 #define RT5682S_JDH_PLUG			(0x0 << 4)
 
+/* Bias current control 7  (0x0110) */
+#define RT5682S_LDO_DACREF_MASK			(0x3 << 4)
+#define RT5682S_LDO_DACREF_1_607V		(0x0 << 4)
+#define RT5682S_LDO_DACREF_1_5V			(0x1 << 4)
+#define RT5682S_LDO_DACREF_1_406V		(0x2 << 4)
+#define RT5682S_LDO_DACREF_1_731V		(0x3 << 4)
+
 /* Charge Pump Internal Register1 (0x0125) */
 #define RT5682S_CP_CLK_HP_MASK			(0x3 << 4)
 #define RT5682S_CP_CLK_HP_100KHZ		(0x0 << 4)