linux-kernel - [V4 1/2] ASoC: max98390: Add reset gpio control

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Message-Id: <20220420044900.2989-1-steve.lee.analog@gmail.com>
Date:   Wed, 20 Apr 2022 13:48:59 +0900
From:   Steve Lee <steve.lee.analog@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Cc:     krzk@...nel.org, nuno.sa@...log.com, ryans.lee@...log.com,
        Steve Lee <steve.lee.analog@...il.com>
Subject: [V4 1/2] ASoC: max98390: Add reset gpio control

 Add reset gpio control to support RESET PIN connected to gpio.

Signed-off-by: Steve Lee <steve.lee.analog@...il.com>
---
V3 -> V4: change reset gpio control as GPIO_ACTIVE_LOW in DT

 sound/soc/codecs/max98390.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/soc/codecs/max98390.c b/sound/soc/codecs/max98390.c
index 40fd6f363f35..bdfd6cccc3d2 100644
--- a/sound/soc/codecs/max98390.c
+++ b/sound/soc/codecs/max98390.c
@@ -1022,6 +1022,7 @@ static int max98390_i2c_probe(struct i2c_client *i2c,
 
 	struct max98390_priv *max98390 = NULL;
 	struct i2c_adapter *adapter = i2c->adapter;
+	struct gpio_desc *reset_gpio;
 
 	ret = i2c_check_functionality(adapter,
 		I2C_FUNC_SMBUS_BYTE
@@ -1073,6 +1074,17 @@ static int max98390_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	reset_gpio = devm_gpiod_get_optional(&i2c->dev,
+					     "reset", GPIOD_OUT_HIGH);
+
+	/* Power on device */
+	if (reset_gpio) {
+		usleep_range(1000, 2000);
+		/* bring out of reset */
+		gpiod_set_value_cansleep(reset_gpio, 0);
+		usleep_range(1000, 2000);
+	}
+
 	/* Check Revision ID */
 	ret = regmap_read(max98390->regmap,
 		MAX98390_R24FF_REV_ID, &reg);
-- 
2.17.1