From c5842b47b2945d6db24b4db6b2c7364e94cbc78b Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 30 Jun 2016 03:48:47 +0200 Subject: iio: pressure: bmp280: add reset GPIO line handling On the APQ8060 Dragonboard the reset line to the BMP085 pressure sensor is not deasserted on boot, so the driver needs to handle this. For a simple GPIO line supplied as a descriptor (from a board file, device tree or ACPI) this does the trick. Signed-off-by: Linus Walleij Signed-off-by: Jonathan Cameron --- drivers/iio/pressure/bmp280.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/iio/pressure') diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c index a147ce2de0e1..77172f047f61 100644 --- a/drivers/iio/pressure/bmp280.c +++ b/drivers/iio/pressure/bmp280.c @@ -23,6 +23,7 @@ #include #include #include +#include /* BMP280 specific registers */ #define BMP280_REG_HUMIDITY_LSB 0xFE @@ -1024,6 +1025,7 @@ static int bmp280_probe(struct i2c_client *client, struct iio_dev *indio_dev; struct bmp280_data *data; unsigned int chip_id; + struct gpio_desc *gpiod; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) @@ -1063,6 +1065,14 @@ static int bmp280_probe(struct i2c_client *client, return -EINVAL; } + /* Bring chip out of reset if there is an assigned GPIO line */ + gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH); + /* Deassert the signal */ + if (!IS_ERR(gpiod)) { + dev_info(&client->dev, "release reset\n"); + gpiod_set_value(gpiod, 0); + } + data->regmap = devm_regmap_init_i2c(client, data->chip_info->regmap_config); if (IS_ERR(data->regmap)) { -- cgit v1.2.3