On Mon, 27 Jun 2016, Linus Walleij wrote:
> On the APQ8060 Dragonboard the reset line to the BMP058 pressure
BMP085
> 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 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)) {
>
--
Peter Meerwald-Stadler
+43-664-2444418 (mobile)
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