ASoC: rt5677: Add dts properties for input/output differential configuration

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rt5677.txt

@@ -19,6 +19,14 @@ Optional properties:
 
 - realtek,pow-ldo2-gpio : The GPIO that controls the CODEC's POW_LDO2 pin.
 
+- realtek,in1-differential
+- realtek,in2-differential
+- realtek,lout1-differential
+- realtek,lout2-differential
+- realtek,lout3-differential
+  Boolean. Indicate MIC1/2 input and LOUT1/2/3 outputs are differential,
+  rather than single-ended.
+
 Pins on the device (for linking into audio routes):
 
   * IN1P
@@ -47,4 +55,5 @@ rt5677 {
 
 	realtek,pow-ldo2-gpio =
 		<&gpio TEGRA_GPIO(V, 3) GPIO_ACTIVE_HIGH>;
+	realtek,in1-differential = "true";
 };

include/sound/rt5677.h

@@ -19,9 +19,12 @@ enum rt5677_dmic2_clk {
 
 
 struct rt5677_platform_data {
-	/* IN1 IN2 can optionally be differential */
+	/* IN1/IN2/LOUT1/LOUT2/LOUT3 can optionally be differential */
 	bool in1_diff;
 	bool in2_diff;
+	bool lout1_diff;
+	bool lout2_diff;
+	bool lout3_diff;
 	/* DMIC2 clock source selection */
 	enum rt5677_dmic2_clk dmic2_clk_pin;
 };

sound/soc/codecs/rt5677.c

@@ -3569,6 +3569,17 @@ MODULE_DEVICE_TABLE(i2c, rt5677_i2c_id);
 
 static int rt5677_parse_dt(struct rt5677_priv *rt5677, struct device_node *np)
 {
+	rt5677->pdata.in1_diff = of_property_read_bool(np,
+					"realtek,in1-differential");
+	rt5677->pdata.in2_diff = of_property_read_bool(np,
+					"realtek,in2-differential");
+	rt5677->pdata.lout1_diff = of_property_read_bool(np,
+					"realtek,lout1-differential");
+	rt5677->pdata.lout2_diff = of_property_read_bool(np,
+					"realtek,lout2-differential");
+	rt5677->pdata.lout3_diff = of_property_read_bool(np,
+					"realtek,lout3-differential");
+
 	rt5677->pow_ldo2 = of_get_named_gpio(np,
 					"realtek,pow-ldo2-gpio", 0);
 
@@ -3660,6 +3671,18 @@ static int rt5677_i2c_probe(struct i2c_client *i2c,
 		regmap_update_bits(rt5677->regmap, RT5677_IN1,
 					RT5677_IN_DF2, RT5677_IN_DF2);
 
+	if (rt5677->pdata.lout1_diff)
+		regmap_update_bits(rt5677->regmap, RT5677_LOUT1,
+					RT5677_LOUT1_L_DF, RT5677_LOUT1_L_DF);
+
+	if (rt5677->pdata.lout2_diff)
+		regmap_update_bits(rt5677->regmap, RT5677_LOUT1,
+					RT5677_LOUT2_L_DF, RT5677_LOUT2_L_DF);
+
+	if (rt5677->pdata.lout3_diff)
+		regmap_update_bits(rt5677->regmap, RT5677_LOUT1,
+					RT5677_LOUT3_L_DF, RT5677_LOUT3_L_DF);
+
 	if (rt5677->pdata.dmic2_clk_pin == RT5677_DMIC_CLK2) {
 		regmap_update_bits(rt5677->regmap, RT5677_GEN_CTRL2,
 					RT5677_GPIO5_FUNC_MASK,