Re: [PATCH v4 06/14] iio: adc: ad7768: Add configurable sampling modes

[Jonathan Cameron]

On Fri, 21 Aug 2026 16:06:59 +0200
Janani Sunil <janani.sunil@xxxxxxxxxx> wrote:

> Derive the available output data rates from MCLK and expose per-channel
> sampling frequency and filter controls.
> 
> Select the fastest compatible power mode for the enabled channels and
> map matching sampling frequency and filter combinations onto the two
> hardware channel profiles. Configure the data clock divider and wait for
> the selected filters to settle before capture.
> 
> Signed-off-by: Janani Sunil <janani.sunil@xxxxxxxxxx>
More minor stuff.

J
> ---
>  drivers/iio/adc/ad7768.c | 580 ++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 543 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7768.c b/drivers/iio/adc/ad7768.c
> index 34233ad6cfca..08d8e97d58fc 100644
> --- a/drivers/iio/adc/ad7768.c
> +++ b/drivers/iio/adc/ad7768.c

> +static int ad7768_apply_channel_modes(struct iio_dev *indio_dev,
> +				      const unsigned long *scan_mask)
> +{
> +	enum ad7768_filter_type mode_filter[AD7768_NUM_CHANNEL_MODES];
> +	unsigned int mode_freq[AD7768_NUM_CHANNEL_MODES];
> +	bool mode_used[AD7768_NUM_CHANNEL_MODES] = { };
>  	struct ad7768_state *st = iio_priv(indio_dev);
>  	unsigned int channel_mask;
>  	unsigned int standby_mask;
> +	unsigned int max_freq = 0;
> +	struct device *dev;
> +	unsigned int c;
>  	int ret;
>  
> +	guard(mutex)(&st->lock);
> +	dev = regmap_get_device(st->regmap);

I can't see why this needs to be under the lock.  I'd just do
it at declaration above.

> +


> +
> +static struct iio_chan_spec_ext_info ad7768_ext_info[] = {
> +	IIO_ENUM("filter_type", IIO_SEPARATE,
> +		 &ad7768_filter_types_enum),

	IIO_ENUM("filter_type", IIO_SEPARATE, &ad7768_filter_types_enum),
	IIO_ENUM_AVAILABLE("filter_type", IIO_SEPARATE, &ad7768_filter_types_enum),

First line easily fits and second is only just over 80 chars. So i'd
do one line for each.


> +	IIO_ENUM_AVAILABLE("filter_type", IIO_SEPARATE,
> +			   &ad7768_filter_types_enum),
> +	{ }
> +};