linux-kernel - [PATCH 1/2] ASoC: rt5640: Allow configuration of LOUT to mono differential mode

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Date:   Fri,  9 Dec 2022 10:56:20 +0000
From:   Jarrah Gosbell <kernel@...ef.tools>
To:     Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     phone-devel@...r.kernel.org, Ondrej Jirman <megi@....cz>,
        Jarrah Gosbell <kernel@...ef.tools>
Subject: [PATCH 1/2] ASoC: rt5640: Allow configuration of LOUT to mono differential mode

From: Ondrej Jirman <megi@....cz>

LOUT output can produce either single-ended stereo signals, or mono
differential signal. Some applications are wired to use LOUT in mono
differential mode. Allow to configure it via device property.

Signed-off-by: Ondrej Jirman <megi@....cz>
Signed-off-by: Jarrah Gosbell <kernel@...ef.tools>
---
 sound/soc/codecs/rt5640.c | 4 ++++
 sound/soc/codecs/rt5640.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index 0f8e6dd214b0..18e01949f20e 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -2717,6 +2717,10 @@ static int rt5640_probe(struct snd_soc_component *component)
 		snd_soc_component_update_bits(component, RT5640_IN1_IN2,
 					      RT5640_IN_DF2, RT5640_IN_DF2);
 
+	if (device_property_read_bool(component->dev, "realtek,lout-differential"))
+		snd_soc_component_update_bits(component, RT5640_DUMMY1,
+					      RT5640_EN_LOUT_DF, RT5640_EN_LOUT_DF);
+
 	if (device_property_read_u32(component->dev, "realtek,dmic1-data-pin",
 				     &val) == 0 && val) {
 		dmic1_data_pin = val - 1;
diff --git a/sound/soc/codecs/rt5640.h b/sound/soc/codecs/rt5640.h
index f58b88e3325b..9847a1ae01f4 100644
--- a/sound/soc/codecs/rt5640.h
+++ b/sound/soc/codecs/rt5640.h
@@ -1978,6 +1978,8 @@
 #define RT5640_ZCD_HP_EN			(0x1 << 15)
 
 /* General Control 1 (0xfa) */
+#define RT5640_EN_LOUT_DF			(0x1 << 14)
+#define RT5640_EN_LOUT_DF_SFT			14
 #define RT5640_M_MONO_ADC_L			(0x1 << 13)
 #define RT5640_M_MONO_ADC_L_SFT			13
 #define RT5640_M_MONO_ADC_R			(0x1 << 12)
-- 
2.35.1