[v3,4/6] iio: mlx90614: Drop MLX90614_CONST_EMISSIVITY_RESOLUTION

The MLX90614_CONST_EMISSIVITY_RESOLUTION can be calculated from
MLX90614_CONST_RAW_EMISSIVITY_MAX, perform the calculation inline
and drio the MLX90614_CONST_EMISSIVITY_RESOLUTION.

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Crt Mori <cmo@melexis.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-iio@vger.kernel.org
---
V3: New patch
---
 drivers/iio/temperature/mlx90614.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Acked-by: Crt Mori <cmo@melexis.com>

On Wed, 10 May 2023 at 12:23, Marek Vasut <marex@denx.de> wrote:
>
> The MLX90614_CONST_EMISSIVITY_RESOLUTION can be calculated from
> MLX90614_CONST_RAW_EMISSIVITY_MAX, perform the calculation inline
> and drio the MLX90614_CONST_EMISSIVITY_RESOLUTION.
>
> Signed-off-by: Marek Vasut <marex@denx.de>
> ---
> Cc: Crt Mori <cmo@melexis.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Peter Meerwald <pmeerw@pmeerw.net>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-iio@vger.kernel.org
> ---
> V3: New patch
> ---
>  drivers/iio/temperature/mlx90614.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
> index b0f69a7b05abc..ecd27fe0c8666 100644
> --- a/drivers/iio/temperature/mlx90614.c
> +++ b/drivers/iio/temperature/mlx90614.c
> @@ -63,7 +63,6 @@
>  #define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
>  #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
>  #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */
> -#define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */
>  #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
>
>  struct mlx90614_data {
> @@ -283,7 +282,8 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev,
>                         *val2 = 0;
>                 } else {
>                         *val = 0;
> -                       *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION;
> +                       *val2 = ret * NSEC_PER_SEC /
> +                               MLX90614_CONST_RAW_EMISSIVITY_MAX;
>                 }
>                 return IIO_VAL_INT_PLUS_NANO;
>         case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
> @@ -321,7 +321,7 @@ static int mlx90614_write_raw(struct iio_dev *indio_dev,
>                 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
>                         return -EINVAL;
>                 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX +
> -                       val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION;
> +                     val2 * MLX90614_CONST_RAW_EMISSIVITY_MAX / NSEC_PER_SEC;
>
>                 ret = mlx90614_power_get(data, false);
>                 if (ret < 0)
> --
> 2.39.2
>