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 <linus.walleij@xxxxxxxxxx>
---
ChangeLog v3->v4:
- Fix BMP058->BMP085 in commit message
ChangeLog v2->v3:
- None, just rebasing/resending
---
drivers/iio/pressure/bmp280.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c
index fa76f5851245..1618968f8889 100644
--- a/drivers/iio/pressure/bmp280.c
+++ b/drivers/iio/pressure/bmp280.c
@@ -23,6 +23,7 @@
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+#include <linux/gpio/consumer.h>
/* 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)) {
--
2.4.11
--
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