From 42e03b0d371a61478ac6fd992bb4183bdccb3028 Mon Sep 17 00:00:00 2001
From: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Date: Mon, 19 Feb 2024 14:11:14 +0100
Subject: [PATCH] iio: temperature: tmp117: add support for vcc-supply

Add support to specify the VCC supply which is required to power the
device. According the datasheet 7.3.1 Power Up, the device needs 1.5ms
after the supply voltage reaches the operating range before the
communcation can begin.

Signed-off-by: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20240219131114.134607-2-m.felsch@pengutronix.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/iio/temperature/tmp117.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/temperature/tmp117.c b/drivers/iio/temperature/tmp117.c
index 059953015ae72..8972083d903a2 100644
--- a/drivers/iio/temperature/tmp117.c
+++ b/drivers/iio/temperature/tmp117.c
@@ -9,6 +9,7 @@
  * Note: This driver assumes that the sensor has been calibrated beforehand.
  */
 
+#include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
@@ -17,6 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/limits.h>
 #include <linux/property.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/iio.h>
 
@@ -148,10 +150,17 @@ static int tmp117_probe(struct i2c_client *client)
 	struct tmp117_data *data;
 	struct iio_dev *indio_dev;
 	int dev_id;
+	int ret;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 		return -EOPNOTSUPP;
 
+	ret = devm_regulator_get_enable(&client->dev, "vcc");
+	if (ret)
+		return ret;
+
+	fsleep(1500);
+
 	dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
 	if (dev_id < 0)
 		return dev_id;
-- 
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