[alsa-devel] [PATCH] ASoC: rt5677: use 'active low' logic for reset pin

[Anatol Pomozov]

According to the datasheet RESET is active low pin, i.e. system goes to
reset state when pin signal is low.

The previous implementeation was assuming the pin is configured as
'active high' in DTS. Changle the gpio handling code and DTS configuration
to 'active low'.

Signed-off-by: Anatol Pomozov <anatol.pomozov at gmail.com>
---
 Documentation/devicetree/bindings/sound/rt5677.txt | 2 +-
 sound/soc/codecs/rt5677.c                          | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/rt5677.txt b/Documentation/devicetree/bindings/sound/rt5677.txt
index f070789..1b3c13d 100644
--- a/Documentation/devicetree/bindings/sound/rt5677.txt
+++ b/Documentation/devicetree/bindings/sound/rt5677.txt
@@ -18,7 +18,7 @@ Required properties:
 Optional properties:
 
 - realtek,pow-ldo2-gpio : The GPIO that controls the CODEC's POW_LDO2 pin.
-- realtek,reset-gpio : The GPIO that controls the CODEC's RESET pin.
+- realtek,reset-gpio : The GPIO that controls the CODEC's RESET pin. Active low.
 
 - realtek,in1-differential
 - realtek,in2-differential
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index b4cd7e3..f73fd12 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -4766,7 +4766,7 @@ static int rt5677_remove(struct snd_soc_codec *codec)
 
 	regmap_write(rt5677->regmap, RT5677_RESET, 0x10ec);
 	gpiod_set_value_cansleep(rt5677->pow_ldo2, 0);
-	gpiod_set_value_cansleep(rt5677->reset_pin, 0);
+	gpiod_set_value_cansleep(rt5677->reset_pin, 1);
 
 	return 0;
 }
@@ -4781,7 +4781,7 @@ static int rt5677_suspend(struct snd_soc_codec *codec)
 		regcache_mark_dirty(rt5677->regmap);
 
 		gpiod_set_value_cansleep(rt5677->pow_ldo2, 0);
-		gpiod_set_value_cansleep(rt5677->reset_pin, 0);
+		gpiod_set_value_cansleep(rt5677->reset_pin, 1);
 	}
 
 	return 0;
@@ -4793,7 +4793,7 @@ static int rt5677_resume(struct snd_soc_codec *codec)
 
 	if (!rt5677->dsp_vad_en) {
 		gpiod_set_value_cansleep(rt5677->pow_ldo2, 1);
-		gpiod_set_value_cansleep(rt5677->reset_pin, 1);
+		gpiod_set_value_cansleep(rt5677->reset_pin, 0);
 		if (rt5677->pow_ldo2 || rt5677->reset_pin)
 			msleep(10);
 
@@ -5138,7 +5138,7 @@ static int rt5677_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 	rt5677->reset_pin = devm_gpiod_get_optional(&i2c->dev,
-			"realtek,reset", GPIOD_OUT_HIGH);
+			"realtek,reset", GPIOD_OUT_LOW);
 	if (IS_ERR(rt5677->reset_pin)) {
 		ret = PTR_ERR(rt5677->reset_pin);
 		dev_err(&i2c->dev, "Failed to request RESET: %d\n", ret);
-- 
2.6.0.rc2.230.g3dd15c0