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>

diff --git a/drivers/iio/temperature/tmp117.c b/drivers/iio/temperature/tmp117.c
index 059953015ae7241f7debdc1f13170eb522836384..8972083d903a2597b8ba2539d3f5d233c5b0371e 100644 (file)
--- 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;