Re: [PATCH V5 2/2] iio: adc: spmi-vadc: Changes to support different scaling

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On 30/11/16 09:07, Phani A, Rama Krishna wrote:
> Hi Jonathan,
> 
> On 27-Nov-16 9:18 PM, Jonathan Cameron wrote:
>> On 24/11/16 05:31, Rama Krishna Phani A wrote:
>>> Several ADC channels are supported in PMIC which can be used to
>>> measure voltage, temperature, current etc. Different scaling can be
>>> applied on the obtained voltage to report in physical units. Scaling
>>> functionality can be different per channel. Add scaling support per
>>> channel. Every channel present in adc has an unique conversion formula
>>> for obtained voltage. Add support to report in Raw as well as in
>>> processed format. Scaling is applied when processed read is requested
>>> and is not applied when a Raw read is requested.
>>>
>>> Signed-off-by: Rama Krishna Phani A <rphani@xxxxxxxxxxxxxx>
>> I obviously didn't make it clear enough in last review.
>>
>> If you can't return a value in response to reading a sysfs attribute, the
>> attribute should not exist.  See below for a suggestion on this.
> Agree., Even here we never expose a channel in sysfs if we dont know the response. Channels in sysfs are populated based on list available from DT. Provided more explanation below.
>>
>> Jonathan
>>> ---
>>>  drivers/iio/adc/qcom-spmi-vadc.c | 435 +++++++++++++++++++++++++++++----------
>>>  1 file changed, 326 insertions(+), 109 deletions(-)
>>>
>>> diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
>>> index 93c0639..a4e5405 100644
>>> --- a/drivers/iio/adc/qcom-spmi-vadc.c
>>> +++ b/drivers/iio/adc/qcom-spmi-vadc.c
>>> @@ -84,7 +84,7 @@
>>>  #define VADC_MAX_ADC_CODE            0xa800
>>>
>>>  #define VADC_ABSOLUTE_RANGE_UV            625000
>>> -#define VADC_RATIOMETRIC_RANGE_UV        1800000
>>> +#define VADC_RATIOMETRIC_RANGE            1800
>>>
>>>  #define VADC_DEF_PRESCALING            0 /* 1:1 */
>>>  #define VADC_DEF_DECIMATION            0 /* 512 */
>>> @@ -100,9 +100,23 @@
>>>
>>>  #define KELVINMIL_CELSIUSMIL            273150
>>>
>>> +#define PMI_CHG_SCALE_1                -138890
>>> +#define PMI_CHG_SCALE_2                391750000000
>>> +
>>>  #define VADC_CHAN_MIN            VADC_USBIN
>>>  #define VADC_CHAN_MAX            VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM
>>>
>>> +/**
>>> + * struct vadc_map_pt - Map the graph representation for ADC channel
>>> + * @x: Represent the ADC digitized code.
>>> + * @y: Represent the physical data which can be temperature, voltage,
>>> + *     resistance.
>>> + */
>>> +struct vadc_map_pt {
>>> +    s32 x;
>>> +    s32 y;
>>> +};
>>> +
>>>  /*
>>>   * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.
>>>   * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for
>>> @@ -148,6 +162,9 @@ struct vadc_prescale_ratio {
>>>   *    start of conversion.
>>>   * @avg_samples: ability to provide single result from the ADC
>>>   *    that is an average of multiple measurements.
>>> + * @scale_fn: Represents the scaling function to convert voltage
>>> + *    physical units desired by the client for the channel.
>>> + *    Referenced from enum vadc_scale_fn_type.
>>>   */
>>>  struct vadc_channel_prop {
>>>      unsigned int channel;
>>> @@ -156,6 +173,7 @@ struct vadc_channel_prop {
>>>      unsigned int prescale;
>>>      unsigned int hw_settle_time;
>>>      unsigned int avg_samples;
>>> +    unsigned int scale_fn;
>>>  };
>>>
>>>  /**
>>> @@ -186,6 +204,37 @@ struct vadc_priv {
>>>      struct mutex         lock;
>>>  };
>>>
>>> +/**
>>> + * struct vadc_scale_fn - Scaling function prototype
>>> + * @scale: Function pointer to one of the scaling functions
>>> + *    which takes the adc properties, channel properties,
>>> + *    and returns the physical result.
>>> + */
>>> +struct vadc_scale_fn {
>>> +    int (*scale)(struct vadc_priv *, const struct vadc_channel_prop *,
>>> +             u16, int *);
>>> +};
>>> +
>>> +/**
>>> + * enum vadc_scale_fn_type - Scaling function to convert ADC code to
>>> + *                physical scaled units for the channel.
>>> + * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV).
>>> + * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC.
>>> + *                 Uses a mapping table with 100K pullup.
>>> + * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade.
>>> + * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC.
>>> + * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp
>>> + * SCALE_NONE: Do not use this scaling type.
>>> + */
>>> +enum vadc_scale_fn_type {
>>> +    SCALE_DEFAULT = 0,
>>> +    SCALE_THERM_100K_PULLUP,
>>> +    SCALE_PMIC_THERM,
>>> +    SCALE_XOTHERM,
>>> +    SCALE_PMI_CHG_TEMP,
>>> +    SCALE_NONE,
>>> +};
>>> +
>>>  static const struct vadc_prescale_ratio vadc_prescale_ratios[] = {
>>>      {.num =  1, .den =  1},
>>>      {.num =  1, .den =  3},
>>> @@ -197,6 +246,44 @@ struct vadc_priv {
>>>      {.num =  1, .den = 10}
>>>  };
>>>
>>> +/* Voltage to temperature */
>>> +static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
>>> +    {1758,    -40},
>>> +    {1742,    -35},
>>> +    {1719,    -30},
>>> +    {1691,    -25},
>>> +    {1654,    -20},
>>> +    {1608,    -15},
>>> +    {1551,    -10},
>>> +    {1483,    -5},
>>> +    {1404,    0},
>>> +    {1315,    5},
>>> +    {1218,    10},
>>> +    {1114,    15},
>>> +    {1007,    20},
>>> +    {900,    25},
>>> +    {795,    30},
>>> +    {696,    35},
>>> +    {605,    40},
>>> +    {522,    45},
>>> +    {448,    50},
>>> +    {383,    55},
>>> +    {327,    60},
>>> +    {278,    65},
>>> +    {237,    70},
>>> +    {202,    75},
>>> +    {172,    80},
>>> +    {146,    85},
>>> +    {125,    90},
>>> +    {107,    95},
>>> +    {92,    100},
>>> +    {79,    105},
>>> +    {68,    110},
>>> +    {59,    115},
>>> +    {51,    120},
>>> +    {44,    125}
>>> +};
>>> +
>>>  static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data)
>>>  {
>>>      return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1);
>>> @@ -418,7 +505,7 @@ static int vadc_measure_ref_points(struct vadc_priv *vadc)
>>>      u16 read_1, read_2;
>>>      int ret;
>>>
>>> -    vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE_UV;
>>> +    vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE;
>>>      vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV;
>>>
>>>      prop = vadc_get_channel(vadc, VADC_REF_1250MV);
>>> @@ -468,6 +555,51 @@ static int vadc_measure_ref_points(struct vadc_priv *vadc)
>>>      return ret;
>>>  }
>>>
>>> +static int vadc_map_voltage_temp(const struct vadc_map_pt *pts,
>>> +                 u32 tablesize, s32 input, s64 *output)
>>> +{
>>> +    bool descending = 1;
>>> +    u32 i = 0;
>>> +
>>> +    if (!pts)
>>> +        return -EINVAL;
>>> +
>>> +    /* Check if table is descending or ascending */
>>> +    if (tablesize > 1) {
>>> +        if (pts[0].x < pts[1].x)
>>> +            descending = 0;
>>> +    }
>>> +
>>> +    while (i < tablesize) {
>>> +        if ((descending) && (pts[i].x < input)) {
>>> +            /* table entry is less than measured*/
>>> +             /* value and table is descending, stop */
>>> +            break;
>>> +        } else if ((!descending) &&
>>> +                (pts[i].x > input)) {
>>> +            /* table entry is greater than measured*/
>>> +            /*value and table is ascending, stop */
>>> +            break;
>>> +        }
>>> +        i++;
>>> +    }
>>> +
>>> +    if (i == 0) {
>>> +        *output = pts[0].y;
>>> +    } else if (i == tablesize) {
>>> +        *output = pts[tablesize - 1].y;
>>> +    } else {
>>> +        /* result is between search_index and search_index-1 */
>>> +        /* interpolate linearly */
>>> +        *output = (((s32)((pts[i].y - pts[i - 1].y) *
>>> +            (input - pts[i - 1].x)) /
>>> +            (pts[i].x - pts[i - 1].x)) +
>>> +            pts[i - 1].y);
>>> +    }
>>> +
>>> +    return 0;
>>> +}
>>> +
>>>  static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code,
>>>                   const struct vadc_channel_prop *prop,
>>>                   s64 *scale_voltage)
>>> @@ -502,6 +634,77 @@ static int vadc_scale_volt(struct vadc_priv *vadc,
>>>      return 0;
>>>  }
>>>
>>> +static int vadc_scale_therm(struct vadc_priv *vadc,
>>> +                const struct vadc_channel_prop *prop, u16 adc_code,
>>> +                int *result_mdec)
>>> +{
>>> +    s64 voltage = 0, result = 0;
>>> +
>>> +    vadc_scale_calib(vadc, adc_code, prop, &voltage);
>>> +
>>> +    if (prop->calibration == VADC_CALIB_ABSOLUTE)
>>> +        voltage /= 1000;
>>> +
>>> +    vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
>>> +                  ARRAY_SIZE(adcmap_100k_104ef_104fb),
>>> +                  voltage, &result);
>>> +    result *= 1000;
>>> +    *result_mdec = result;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int vadc_scale_die_temp(struct vadc_priv *vadc,
>>> +                   const struct vadc_channel_prop *prop,
>>> +                   u16 adc_code, int *result_mdec)
>>> +{
>>> +    const struct vadc_prescale_ratio *prescale;
>>> +    s64 voltage = 0;
>>> +
>>> +    vadc_scale_calib(vadc, adc_code, prop, &voltage);
>>> +
>>> +    if (voltage > 0) {
>>> +        prescale = &vadc_prescale_ratios[prop->prescale];
>>> +        voltage = voltage * prescale->den;
>>> +        voltage /= (prescale->num * 2);
>>> +    } else {
>>> +        voltage = 0;
>>> +    }
>>> +
>>> +    voltage -= KELVINMIL_CELSIUSMIL;
>>> +    *result_mdec = voltage;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int vadc_scale_chg_temp(struct vadc_priv *vadc,
>>> +                   const struct vadc_channel_prop *prop,
>>> +                   u16 adc_code, int *result_mdec)
>>> +{
>>> +    const struct vadc_prescale_ratio *prescale;
>>> +    s64 voltage = 0, result = 0;
>>> +
>>> +    vadc_scale_calib(vadc, adc_code, prop, &voltage);
>>> +
>>> +    prescale = &vadc_prescale_ratios[prop->prescale];
>>> +    voltage = voltage * prescale->den;
>>> +    voltage = div64_s64(voltage, prescale->num);
>>> +    voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
>>> +    voltage = (voltage + PMI_CHG_SCALE_2);
>>> +    result =  div64_s64(voltage, 1000000);
>>> +    *result_mdec = result;
>>> +
>>> +    return 0;
>>> +}
>>> +
>>> +static int vadc_scale(struct vadc_priv *vadc,
>>> +              const struct vadc_channel_prop *prop, u16 adc_code,
>>> +              int *scale)
>>> +{
>>> +    dev_err(vadc->dev, "Need a scale function\n");
>>> +    return 0;
>>> +}
>>> +
>>>  static int vadc_decimation_from_dt(u32 value)
>>>  {
>>>      if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
>>> @@ -547,6 +750,15 @@ static int vadc_avg_samples_from_dt(u32 value)
>>>      return __ffs64(value);
>>>  }
>>>
>>> +static struct vadc_scale_fn scale_fn[] = {
>>> +    [SCALE_DEFAULT] = {vadc_scale_volt},
>>> +    [SCALE_THERM_100K_PULLUP] = {vadc_scale_therm},
>>> +    [SCALE_PMIC_THERM] = {vadc_scale_die_temp},
>>> +    [SCALE_XOTHERM] = {vadc_scale_therm},
>>> +    [SCALE_PMI_CHG_TEMP] = {vadc_scale_chg_temp},
>>> +    [SCALE_NONE] = {vadc_scale},
>>> +};
>>> +
>>>  static int vadc_read_raw(struct iio_dev *indio_dev,
>>>               struct iio_chan_spec const *chan, int *val, int *val2,
>>>               long mask)
>>> @@ -563,7 +775,7 @@ static int vadc_read_raw(struct iio_dev *indio_dev,
>>>          if (ret)
>>>              break;
>>>
>>> -        vadc_scale_volt(vadc, prop, adc_code, val);
>>> +        scale_fn[prop->scale_fn].scale(vadc, prop, adc_code, val);
>>>
>>>          return IIO_VAL_INT;
>>>      case IIO_CHAN_INFO_RAW:
>>> @@ -606,23 +818,27 @@ struct vadc_channels {
>>>      unsigned int prescale_index;
>>>      enum iio_chan_type type;
>>>      long info_mask;
>>> +    unsigned int scale_fn;
>>>  };
>>>
>>> -#define VADC_CHAN(_dname, _type, _mask, _pre)                \
>>> +#define VADC_CHAN(_dname, _type, _mask, _pre, _scale)            \
>>>      [VADC_##_dname] = {                        \
>>>          .datasheet_name = __stringify(_dname),            \
>>>          .prescale_index = _pre,                    \
>>>          .type = _type,                        \
>>> -        .info_mask = _mask                    \
>>> +        .info_mask = _mask,                    \
>>> +        .scale_fn = _scale                    \
>>>      },                                \
>>>
>>> -#define VADC_CHAN_TEMP(_dname, _pre)                    \
>>> -    VADC_CHAN(_dname, IIO_TEMP, BIT(IIO_CHAN_INFO_PROCESSED), _pre)    \
>>> +#define VADC_CHAN_TEMP(_dname, _pre, _scale)                \
>>> +    VADC_CHAN(_dname, IIO_TEMP,                    \
>>> +        BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),    \
>>> +        _pre, _scale)                        \
>>>
>>> -#define VADC_CHAN_VOLT(_dname, _pre)                    \
>>> +#define VADC_CHAN_VOLT(_dname, _pre, _scale)                \
>>>      VADC_CHAN(_dname, IIO_VOLTAGE,                    \
>>>            BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\
>>> -          _pre)                            \
>>> +          _pre, _scale)                        \
>> In the SCALE_NONE case you are still creating the sysfs attributes to provide
>> processed.  Just have a variant of this macro that doesn't do this.
>>
>> That way we don't end up with a sysfs attribute that always results in
>> an error!
>>
>> #define VADC_CHAN_VOLT_NO_KNOWN_SCALEE(_dname, _pre) \
>>     VADC_CHAN(_dname, IIO_VOLTAGE, BIT(IIO_CHAN_INFO_RAW), _pre);
>>
> sysfs attributes will be created only for the channels that are populated from DT. Here we are just mapping a function that needs to be invoked in case the channel is available.
> 
> None of the channels are exposed in sysfs unconditionally. Channels with DT entry only will get exposed in sysfs.
> 
> For SCALE_NONE .., none of these channels will get exposed in sysfs.
> Even for other SCALE_* ., the channels will be shown in sysfs only if there is any corresponding DT entry for that channel.
But if someone does write a DT that specifies those channels then it'll be wrong.
The fix is easy. Fix it in here.
> 
> If an entry is created for channels with SCALE_NONE in DT ., then the corresponding SCALE_* function needs to be implemented by removing SCALE_NONE.
>>>
>>>  /*
>>>   * The array represents all possible ADC channels found in the supported PMICs.
>>> @@ -630,106 +846,106 @@ struct vadc_channels {
>>>   * gaps in the array should be treated as reserved channels.
>>>   */
>>>  static const struct vadc_channels vadc_chans[] = {
>>> -    VADC_CHAN_VOLT(USBIN, 4)
>>> -    VADC_CHAN_VOLT(DCIN, 4)
>>> -    VADC_CHAN_VOLT(VCHG_SNS, 3)
>>> -    VADC_CHAN_VOLT(SPARE1_03, 1)
>>> -    VADC_CHAN_VOLT(USB_ID_MV, 1)
>>> -    VADC_CHAN_VOLT(VCOIN, 1)
>>> -    VADC_CHAN_VOLT(VBAT_SNS, 1)
>>> -    VADC_CHAN_VOLT(VSYS, 1)
>>> -    VADC_CHAN_TEMP(DIE_TEMP, 0)
>>> -    VADC_CHAN_VOLT(REF_625MV, 0)
>>> -    VADC_CHAN_VOLT(REF_1250MV, 0)
>>> -    VADC_CHAN_VOLT(CHG_TEMP, 0)
>>> -    VADC_CHAN_VOLT(SPARE1, 0)
>>> -    VADC_CHAN_VOLT(SPARE2, 0)
>>> -    VADC_CHAN_VOLT(GND_REF, 0)
>>> -    VADC_CHAN_VOLT(VDD_VADC, 0)
>>> -
>>> -    VADC_CHAN_VOLT(P_MUX1_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX2_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX3_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX4_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX5_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX6_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX7_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX8_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX9_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX10_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX11_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX12_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX13_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX14_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX15_1_1, 0)
>>> -    VADC_CHAN_VOLT(P_MUX16_1_1, 0)
>>> -
>>> -    VADC_CHAN_VOLT(P_MUX1_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX2_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX3_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX4_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX5_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX6_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX7_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX8_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX9_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX10_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX11_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX12_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX13_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX14_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX15_1_3, 1)
>>> -    VADC_CHAN_VOLT(P_MUX16_1_3, 1)
>>> -
>>> -    VADC_CHAN_VOLT(LR_MUX1_BAT_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_XO_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX4_AMUX_THM1, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX5_AMUX_THM2, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX6_AMUX_THM3, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX7_HW_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX8_AMUX_THM4, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX9_AMUX_THM5, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX10_USB_ID, 0)
>>> -    VADC_CHAN_VOLT(AMUX_PU1, 0)
>>> -    VADC_CHAN_VOLT(AMUX_PU2, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_BUF_XO_THERM, 0)
>>> -
>>> -    VADC_CHAN_VOLT(LR_MUX1_PU1_BAT_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX2_PU1_BAT_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_PU1_XO_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX4_PU1_AMUX_THM1, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX5_PU1_AMUX_THM2, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX6_PU1_AMUX_THM3, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX7_PU1_AMUX_HW_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX8_PU1_AMUX_THM4, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX9_PU1_AMUX_THM5, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX10_PU1_AMUX_USB_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_XO_THERM, 0)
>>> -
>>> -    VADC_CHAN_VOLT(LR_MUX1_PU2_BAT_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX2_PU2_BAT_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_PU2_XO_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX4_PU2_AMUX_THM1, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX5_PU2_AMUX_THM2, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX6_PU2_AMUX_THM3, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX7_PU2_AMUX_HW_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX8_PU2_AMUX_THM4, 0)
>>  -    VADC_CHAN_VOLT(LR_MUX9_PU2_AMUX_THM5, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX10_PU2_AMUX_USB_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_BUF_PU2_XO_THERM, 0)
>>> -
>>> -    VADC_CHAN_VOLT(LR_MUX1_PU1_PU2_BAT_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX2_PU1_PU2_BAT_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_PU1_PU2_XO_THERM, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX4_PU1_PU2_AMUX_THM1, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX5_PU1_PU2_AMUX_THM2, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX6_PU1_PU2_AMUX_THM3, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX8_PU1_PU2_AMUX_THM4, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX9_PU1_PU2_AMUX_THM5, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0)
>>> -    VADC_CHAN_VOLT(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0)
>>> +    VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(VCHG_SNS, 3, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(SPARE1_03, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(USB_ID_MV, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(VBAT_SNS, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT)
>>> +    VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM)
>>> +    VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(CHG_TEMP, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(SPARE1, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP)
>>> +    VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT)
>>> +    VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT)
>>> +
>>> +    VADC_CHAN_VOLT(P_MUX1_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX2_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX3_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX4_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX5_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX6_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX7_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX8_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX9_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX10_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX11_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX12_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX13_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX14_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX15_1_1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX16_1_1, 0, SCALE_NONE)
>>> +
>>> +    VADC_CHAN_VOLT(P_MUX1_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX2_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX3_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX4_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX5_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX6_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX7_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX8_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX9_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX10_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX11_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX12_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX13_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX14_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX15_1_3, 1, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(P_MUX16_1_3, 1, SCALE_NONE)
>>> +
>>> +    VADC_CHAN_VOLT(LR_MUX1_BAT_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX2_BAT_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX3_XO_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX4_AMUX_THM1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX5_AMUX_THM2, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX6_AMUX_THM3, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX7_HW_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX8_AMUX_THM4, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX9_AMUX_THM5, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX10_USB_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(AMUX_PU1, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(AMUX_PU2, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX3_BUF_XO_THERM, 0, SCALE_NONE)
>>> +
>>> +    VADC_CHAN_TEMP(LR_MUX1_PU1_BAT_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX2_PU1_BAT_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_PU1_XO_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP)
>>> +    VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP)
>>> +    VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP)
>>> +    VADC_CHAN_VOLT(LR_MUX7_PU1_AMUX_HW_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP)
>>> +    VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP)
>>> +    VADC_CHAN_VOLT(LR_MUX10_PU1_AMUX_USB_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM)
>>> +
>>> +    VADC_CHAN_TEMP(LR_MUX1_PU2_BAT_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX2_PU2_BAT_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_PU2_XO_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX4_PU2_AMUX_THM1, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX5_PU2_AMUX_THM2, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX6_PU2_AMUX_THM3, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX7_PU2_AMUX_HW_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX8_PU2_AMUX_THM4, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX9_PU2_AMUX_THM5, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX10_PU2_AMUX_USB_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_BUF_PU2_XO_THERM, 0, SCALE_NONE)
>>> +
>>> +    VADC_CHAN_TEMP(LR_MUX1_PU1_PU2_BAT_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX2_PU1_PU2_BAT_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_PU1_PU2_XO_THERM, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX4_PU1_PU2_AMUX_THM1, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX5_PU1_PU2_AMUX_THM2, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX6_PU1_PU2_AMUX_THM3, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX8_PU1_PU2_AMUX_THM4, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX9_PU1_PU2_AMUX_THM5, 0, SCALE_NONE)
>>> +    VADC_CHAN_VOLT(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0, SCALE_NONE)
>>> +    VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0, SCALE_NONE)
>>>  };
>>>
>>>  static int vadc_get_dt_channel_data(struct device *dev,
>>> @@ -848,6 +1064,7 @@ static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
>>>              return ret;
>>>          }
>>>
>>> +        prop.scale_fn = vadc_chans[prop.channel].scale_fn;
>>>          vadc->chan_props[index] = prop;
>>>
>>>          vadc_chan = &vadc_chans[prop.channel];
>>>
>>
> Thanks,
> Ramakrishna
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