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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Mon, 25 Jul 2022 23:15:59 +0200
Message-ID: <CAHp75VdQ_oCjyXsXxTEWfKJK=T+OOP=AEXz8KQq5b2Hu8VHy9w@mail.gmail.com>
Subject: Re: [PATCH v4 4/5] iio: pressure: bmp280: Add support for BMP380
 sensor family
To:     Angel Iglesias <ang.iglesiasg@gmail.com>
Cc:     linux-iio <linux-iio@vger.kernel.org>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Paul Cercueil <paul@crapouillou.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Sat, Jul 23, 2022 at 7:40 PM Angel Iglesias <ang.iglesiasg@gmail.com> wrote:
>
> Adds compatibility with the new generation of this sensor, the BMP380
>
> Includes basic sensor initialization to do pressure and temp
> measurements and allows tuning oversampling settings for each channel.
>
> The compensation algorithms are adapted from the device datasheet and
> the repository https://github.com/BoschSensortec/BMP3-Sensor-API

...

> +       /* wait for 2ms for command to be proccessed */

processed

> +       dev_dbg(data->dev, "Command 0x%X proccessed successfully\n", cmd);

Ditto. Can you run a spell checker? Kernel has a little one called codespell.

> +
> +       return 0;
> +}

...

> +static s32 bmp380_compensate_temp(struct bmp280_data *data, u32 adc_temp)
> +{
> +       s64 var1, var2, var3, var4, var5, var6, comp_temp;
> +       struct bmp380_calib *calib = &data->calib.bmp380;
> +
> +       var1 = ((s64) adc_temp) - (((s64) calib->T1) << 8);
> +       var2 = var1 * ((s64) calib->T2);
> +       var3 = var1 * var1;
> +       var4 = var3 * ((s64) calib->T3);
> +       var5 = (var2 << 18) + var4;
> +       var6 = var5 >> 32;
> +       data->t_fine = (s32) var6;
> +       comp_temp = (var6 * 25) >> 14;
> +
> +       comp_temp = clamp_val(comp_temp, BMP380_MIN_TEMP, BMP380_MAX_TEMP);
> +       return (s32) comp_temp;
> +}

...

> +       s64 var1, var2, var3, var4, var5, var6, offset, sensitivity;
> +       u64 comp_press;
> +       struct bmp380_calib *calib = &data->calib.bmp380;
> +
> +       var1 = ((s64)data->t_fine) * ((s64)data->t_fine);
> +       var2 = var1 >> 6;
> +       var3 = (var2 * ((s64) data->t_fine)) >> 8;
> +       var4 = (((s64)calib->P8) * var3) >> 5;
> +       var5 = (((s64) calib->P7) * var1) << 4;
> +       var6 = (((s64) calib->P6) * ((s64)data->t_fine)) << 22;
> +       offset = (((s64)calib->P5) << 47) + var4 + var5 + var6;
> +       var2 = (((s64)calib->P4) * var3) >> 5;
> +       var4 = (((s64) calib->P3) * var1) << 2;
> +       var5 = (((s64) calib->P2) - ((s64) 1<<14)) *
> +               (((s64)data->t_fine) << 21);
> +       sensitivity = ((((s64) calib->P1) - ((s64) 1 << 14)) << 46) +
> +                       var2 + var4 + var5;
> +       var1 = (sensitivity >> 24) * ((s64)adc_press);
> +       var2 = ((s64)calib->P10) * ((s64) data->t_fine);
> +       var3 = var2 + (((s64) calib->P9) << 16);
> +       var4 = (var3 * ((s64)adc_press)) >> 13;
> +
> +       /*
> +        * Dividing by 10 followed by multiplying by 10 to avoid
> +        * possible overflow caused by (uncomp_data->pressure * partial_data4)
> +        */
> +       var5 = (((s64)adc_press) * (var4 / 10)) >> 9;
> +       var5 *= 10;
> +       var6 = ((s64)adc_press) * ((s64)adc_press);
> +       var2 = (((s64)calib->P11) * var6) >> 16;
> +       var3 = (var2 * ((s64)adc_press)) >> 7;
> +       var4 = (offset >> 2) + var1 + var5 + var3;
> +       comp_press = ((u64)var4 * 25) >> 40;


Kbuild bot is right, you forgot to (compile-)test for a 32-bit machine.

...

> +       ret = regmap_bulk_read(data->regmap, BMP380_REG_TEMP_XLSB, data->buf, 3);

sizeof() ?

...

> +       /* Read and compensate temperature so we get a reading of t_fine. */

for temperature

...

> +       ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB, data->buf, 3);

sizeof() ?

...

> +       .oversampling_temp_default = ilog2(1),

> +       .oversampling_press_default = ilog2(4),

BIT()

...

> +#define BMP380_REG_CMD                 0x7E
> +#define BMP380_REG_CONFIG              0x1F
> +#define BMP380_REG_ODR                 0X1D
> +#define BMP380_REG_OSR                 0X1C
> +#define BMP380_REG_POWER_CONTROL       0X1B
> +#define BMP380_REG_IF_CONFIG           0X1A
> +#define BMP380_REG_INT_CONTROL         0X19
> +#define BMP380_REG_INT_STATUS          0X11
> +#define BMP380_REG_EVENT               0X10
> +#define BMP380_REG_STATUS              0X03
> +#define BMP380_REG_ERROR               0X02
> +#define BMP380_REG_ID                  0X00
> +
> +#define BMP380_REG_FIFO_CONFIG_1       0X18
> +#define BMP380_REG_FIFO_CONFIG_2       0X17
> +#define BMP380_REG_FIFO_WATERMARK_MSB  0X16
> +#define BMP380_REG_FIFO_WATERMARK_LSB  0X15
> +#define BMP380_REG_FIFO_DATA           0X14
> +#define BMP380_REG_FIFO_LENGTH_MSB     0X13
> +#define BMP380_REG_FIFO_LENGTH_LSB     0X12
> +
> +#define BMP380_REG_SENSOR_TIME_MSB     0X0E
> +#define BMP380_REG_SENSOR_TIME_LSB     0X0D
> +#define BMP380_REG_SENSOR_TIME_XLSB    0X0C
> +
> +#define BMP380_REG_TEMP_MSB            0X09
> +#define BMP380_REG_TEMP_LSB            0X08
> +#define BMP380_REG_TEMP_XLSB           0X07
> +
> +#define BMP380_REG_PRESS_MSB           0X06
> +#define BMP380_REG_PRESS_LSB           0X05
> +#define BMP380_REG_PRESS_XLSB          0X04
> +
> +#define BMP380_REG_CALIB_TEMP_START    0x31

Be consistent x vs X (we prefer x).

-- 
With Best Regards,
Andy Shevchenko