Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19;
From:   Steve Lee <steve.lee.analog@gmail.com>
To:     lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz,
        tiwai@suse.com, ryans.lee@maximintegrated.com,
        linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org
Cc:     krzk@kernel.org, nuno.sa@analog.com,
        Steve Lee <steve.lee.analog@gmail.com>
Subject: [V3 1/2] ASoC: max98390: Add reset gpio control
Date:   Mon, 28 Mar 2022 11:11:38 +0900
Message-Id: <20220328021139.8700-1-steve.lee.analog@gmail.com>
Precedence: bulk

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

Signed-off-by: Steve Lee <steve.lee.analog@gmail.com>
---
 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..05df9b85d9b0 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_LOW);
+
+	/* Power on device */
+	if (reset_gpio) {
+		usleep_range(1000, 2000);
+		/* bring out of reset */
+		gpiod_set_value_cansleep(reset_gpio, 1);
+		usleep_range(1000, 2000);
+	}
+
 	/* Check Revision ID */
 	ret = regmap_read(max98390->regmap,
 		MAX98390_R24FF_REV_ID, &reg);
-- 
2.17.1