linux-kernel - [PATCH 3/4] iio: proximity: vl53l0x-i2c: Fix reset sequence

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Message-Id: <20260119-vl53l0x-v1-3-cf71715a1353@protonmail.com>
Date: Mon, 19 Jan 2026 18:19:57 +0100
From: Petr Hodina via B4 Relay <devnull+petr.hodina.protonmail.com@...nel.org>
To: Song Qiang <songqiang1304521@...il.com>, 
 Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>, David Heidelberg <david@...t.cz>
Cc: linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Petr Hodina <petr.hodina@...tonmail.com>
Subject: [PATCH 3/4] iio: proximity: vl53l0x-i2c: Fix reset sequence

From: Petr Hodina <petr.hodina@...tonmail.com>

Fix the reset GPIO handling and power-up timing to better match the
VL53L0X reset requirements.

Signed-off-by: Petr Hodina <petr.hodina@...tonmail.com>
---
 drivers/iio/proximity/vl53l0x-i2c.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index 7bfab396377a..6901ce7dd835 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -275,9 +275,13 @@ static int vl53l0x_power_on(struct vl53l0x_data *data)
 			return ret;
 	}
 
-	gpiod_set_value_cansleep(data->reset_gpio, 0);
-
-	usleep_range(3200, 5000);
+	usleep_range(5000, 6000);
+	if (data->reset_gpio) {
+		gpiod_set_value_cansleep(data->reset_gpio, 1);
+		usleep_range(5000, 6000);
+		gpiod_set_value_cansleep(data->reset_gpio, 0);
+		usleep_range(5000, 6000);
+	}
 
 	return 0;
 }
@@ -354,7 +358,7 @@ static int vl53l0x_probe(struct i2c_client *client)
 		return dev_err_probe(&client->dev, PTR_ERR(data->vio_supply),
 				     "Unable to get VDDIO regulator\n");
 
-	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(data->reset_gpio))
 		return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio),
 				     "Cannot get reset GPIO\n");

-- 
2.52.0