Re: [PATCH v3 9/9] iio: adc: ti-ads1262: support common mode supplies

On 8/7/26 10:58 PM, Kurt Borja wrote:
> Enable common mode regulators. The usual configuration is to have our
> own 'vbias' regulator connected internally as common mode voltage on the
> AINCOM pin.
> 
> Signed-off-by: Kurt Borja <[email protected]>
> ---
>  drivers/iio/adc/ti-ads1262.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/iio/adc/ti-ads1262.c b/drivers/iio/adc/ti-ads1262.c
> index 533574169b04..238d803abc50 100644
> --- a/drivers/iio/adc/ti-ads1262.c
> +++ b/drivers/iio/adc/ti-ads1262.c
> @@ -962,6 +962,27 @@ static irqreturn_t ads1262_irq_handler(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> +static int ads1262_common_mode_setup(struct ads1262 *st)
> +{
> +	struct device *dev = &st->spi->dev;
> +	char name[sizeof("aincom")];
> +	int ret;
> +
> +	for (unsigned int i = 0; i <= ADS1262_INPMUX_AINCOM; i++) {
> +		if (i < ADS1262_INPMUX_AINCOM)
> +			scnprintf(name, sizeof(name), "ain%u", i);
> +		else
> +			scnprintf(name, sizeof(name), "aincom");
> +
> +		ret = devm_regulator_get_enable_optional(dev, name);

We need to get the voltage which is then used to provide an offset
(IIO_CHAN_INFO_OFFSET) for the channel.

> +		if (ret < 0 && ret != -ENODEV)
> +			return dev_err_probe(dev, ret,
> +					     "failed to get common mode supply: %s\n", name);
> +	}
> +
> +	return 0;
> +}
> +
>  static int ads1262_regulator_enable(struct regulator_dev *rdev)
>  {
>  	struct ads1262 *st = rdev_get_drvdata(rdev);
> @@ -1797,6 +1818,10 @@ static int ads1262_spi_probe(struct spi_device *spi)
>  	if (ret)
>  		return ret;
>  
> +	ret = ads1262_common_mode_setup(st);
> +	if (ret)
> +		return ret;
> +
>  	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
>  					      iio_pollfunc_store_time,
>  					      ads1262_trigger_handler,
>