On Fri, 26 Jul 2024 01:10:34 +0200 Vasileios Amoiridis <vassilisamir@xxxxxxxxx> wrote: > The BM(P/E)28x devices have an option for soft reset which is also > recommended by the Bosch Sensortech BME2 Sensor API to be used before the > initial configuration of the device. > > Link: https://github.com/boschsensortec/BME280_SensorAPI/blob/bme280_v3.5.1/bme280.c#L429 > Signed-off-by: Vasileios Amoiridis <vassilisamir@xxxxxxxxx> Trivial passing comment seeing as you are going do be doing a v3 anyway. Jonathan > --- > drivers/iio/pressure/bmp280-core.c | 28 ++++++++++++++++++++++++++++ > drivers/iio/pressure/bmp280.h | 3 +++ > 2 files changed, 31 insertions(+) > > diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c > index d5e5eb22667a..acbc33aacc09 100644 > --- a/drivers/iio/pressure/bmp280-core.c > +++ b/drivers/iio/pressure/bmp280-core.c > @@ -963,6 +963,32 @@ static const unsigned long bme280_avail_scan_masks[] = { > 0 > }; > > +static int bmp280_preinit(struct bmp280_data *data) > +{ > + unsigned int reg; > + int ret; > + > + ret = regmap_write(data->regmap, BMP280_REG_RESET, BMP280_RST_SOFT_CMD); > + if (ret) { > + dev_err(data->dev, "Failed to reset device.\n"); > + return ret; Is this only ever called from probe? If so, return dev_err_probe() which will save a few lines of code. > + } > + > + usleep_range(data->start_up_time, data->start_up_time + 500); > + > + ret = regmap_read(data->regmap, BMP280_REG_STATUS, ®); > + if (ret) { > + dev_err(data->dev, "Failed to read status register.\n"); > + return ret; > + } > + if (reg & BMP280_REG_STATUS_IM_UPDATE) { > + dev_err(data->dev, "Failed to copy NVM contents.\n"); > + return ret; > + } > + > + return 0; > +} > + > static int bmp280_chip_config(struct bmp280_data *data) > { > u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) | > @@ -1079,6 +1105,7 @@ const struct bmp280_chip_info bmp280_chip_info = { > .read_temp = bmp280_read_temp, > .read_press = bmp280_read_press, > .read_calib = bmp280_read_calib, > + .preinit = bmp280_preinit, > > .trigger_handler = bmp280_trigger_handler, > }; > @@ -1196,6 +1223,7 @@ const struct bmp280_chip_info bme280_chip_info = { > .read_press = bmp280_read_press, > .read_humid = bme280_read_humid, > .read_calib = bme280_read_calib, > + .preinit = bmp280_preinit, > > .trigger_handler = bme280_trigger_handler, > }; > diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h > index 9bea0b84d2f4..a9f220c1f77a 100644 > --- a/drivers/iio/pressure/bmp280.h > +++ b/drivers/iio/pressure/bmp280.h > @@ -205,6 +205,9 @@ > #define BMP280_REG_CONFIG 0xF5 > #define BMP280_REG_CTRL_MEAS 0xF4 > #define BMP280_REG_STATUS 0xF3 > +#define BMP280_REG_STATUS_IM_UPDATE BIT(0) > +#define BMP280_REG_RESET 0xE0 > +#define BMP280_RST_SOFT_CMD 0xB6 > > #define BMP280_REG_COMP_TEMP_START 0x88 > #define BMP280_COMP_TEMP_REG_COUNT 6
