linux-kernel - [PATCH v3 1/2] ASoC: max98927: Handle reset gpio when probing i2c

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Date:   Fri,  3 Sep 2021 03:49:50 +0200
From:   Alejandro <atafalla@...on.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Alejandro Tafalla <atafalla@...on.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] ASoC: max98927: Handle reset gpio when probing i2c

From: Alejandro Tafalla <atafalla@...on.com>

Drive the reset gpio if defined in the DTS node.

Signed-off-by: Alejandro Tafalla <atafalla@...on.com>
---
 sound/soc/codecs/max98927.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/sound/soc/codecs/max98927.c b/sound/soc/codecs/max98927.c
index 8b206ee77709..daf06b503433 100644
--- a/sound/soc/codecs/max98927.c
+++ b/sound/soc/codecs/max98927.c
@@ -868,6 +868,7 @@ static int max98927_i2c_probe(struct i2c_client *i2c,
 	int ret = 0, value;
 	int reg = 0;
 	struct max98927_priv *max98927 = NULL;
+	struct gpio_desc *reset_gpio;
 
 	max98927 = devm_kzalloc(&i2c->dev,
 		sizeof(*max98927), GFP_KERNEL);
@@ -898,6 +899,19 @@ static int max98927_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
+	reset_gpio
+		= devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(reset_gpio)) {
+		ret = PTR_ERR(reset_gpio);
+		return dev_err_probe(&i2c->dev, ret, "failed to request GPIO reset pin");
+	}
+
+	if (reset_gpio) {
+		usleep_range(8000, 10000);
+		gpiod_set_value_cansleep(reset_gpio, 1);
+		usleep_range(1000, 5000);
+	}
+
 	/* Check Revision ID */
 	ret = regmap_read(max98927->regmap,
 		MAX98927_R01FF_REV_ID, &reg);
-- 
2.33.0