ASoC: nau8822: add speaker Bridge Tied Output configuration

Allow configuring the two loudspeaker outputs as a
single Bridge Tied Load output getting higher output power.
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20230104140412.35575-4-francesco@dolcini.itSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/nau8822.c

@@ -1056,6 +1056,7 @@ static const int update_reg[] = {
 static int nau8822_probe(struct snd_soc_component *component)
 {
 	int i;
+	struct device_node *of_node = component->dev->of_node;
 
 	/*
 	 * Set the update bit in all registers, that have one. This way all
@@ -1066,6 +1067,14 @@ static int nau8822_probe(struct snd_soc_component *component)
 		snd_soc_component_update_bits(component,
 			update_reg[i], 0x100, 0x100);
 
+	/* Check property to configure the two loudspeaker outputs as
+	 * a single Bridge Tied Load output
+	 */
+	if (of_property_read_bool(of_node, "nuvoton,spk-btl"))
+		snd_soc_component_update_bits(component,
+					      NAU8822_REG_RIGHT_SPEAKER_CONTROL,
+					      NAU8822_RSUBBYP, NAU8822_RSUBBYP);
+
 	return 0;
 }
 

sound/soc/codecs/nau8822.h

@@ -187,6 +187,15 @@
 /* NAU8822_REG_PLL_K3 (0x27) */
 #define NAU8822_PLLK3_MASK			0x1FF
 
+/* NAU8822_REG_RIGHT_SPEAKER_CONTROL (0x2B) */
+#define NAU8822_RMIXMUT				0x20
+#define NAU8822_RSUBBYP				0x10
+
+#define NAU8822_RAUXRSUBG_SFT			1
+#define NAU8822_RAUXRSUBG_MASK			0x0E
+
+#define NAU8822_RAUXSMUT			0x01
+
 /* System Clock Source */
 enum {
 	NAU8822_CLK_MCLK,