Re: [PATCH v5 5/5] iio: adc: ad7192: Add AD7194 support

[Alisa-Dariana Roman]

On 13.04.2024 23:05, David Lechner wrote:
> On Sat, Apr 13, 2024 at 10:13 AM Alisa-Dariana Roman
> <alisadariana@xxxxxxxxx> wrote:
> > Unlike the other AD719Xs, AD7194 has configurable differential
> > channels. The user can dynamically configure them in the devicetree.
> >
> > Also modify config AD7192 description for better scaling.
> >
> > Moved ad7192_chip_info struct definition to allow use of callback
> > function parse_channels().
>
> It looks like this no longer needs to be moved in this revision.
>
> > Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
> > ---
> >   drivers/iio/adc/Kconfig  |  11 ++-
> >   drivers/iio/adc/ad7192.c | 140 ++++++++++++++++++++++++++++++++++++---
> >   2 files changed, 138 insertions(+), 13 deletions(-)

..

> > +       if (!ad7194_channels)
> > +               return -ENOMEM;
> > +
> > +       indio_dev->channels = ad7194_channels;
> > +       indio_dev->num_channels = num_channels;
> > +
> > +       device_for_each_child_node(dev, child) {
> > +               *ad7194_channels = ad7194_chan_diff;
> > +               ad7194_channels->scan_index = index++;
> > +               ret = ad7192_parse_channel(child, ad7194_channels);
> > +               if (ret) {
> > +                       fwnode_handle_put(child);
> > +                       return ret;
> > +               }
> > +               ad7194_channels++;
> > +       }
> > +
> > +       *ad7194_channels = ad7194_chan_temp;
> > +       ad7194_channels->scan_index = index++;
> > +       ad7194_channels->address = AD7194_CH_TEMP;
> > +       ad7194_channels++;
>
> nit: It would seem more natural to have all voltage channels
> altogether rather than having the temperature channel in between.

I wrote the channels like this to match the other chips:

static const struct iio_chan_spec ad7193_channels[] = {
	AD7193_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M),
	AD7193_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M),
	AD7193_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M),
	AD7193_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M),
	AD719x_TEMP_CHANNEL(4, AD7193_CH_TEMP),
	AD7193_DIFF_CHANNEL(5, 2, 2, AD7193_CH_AIN2P_AIN2M),
	AD7193_CHANNEL(6, 1, AD7193_CH_AIN1),
	AD7193_CHANNEL(7, 2, AD7193_CH_AIN2),
	AD7193_CHANNEL(8, 3, AD7193_CH_AIN3),
	AD7193_CHANNEL(9, 4, AD7193_CH_AIN4),
	AD7193_CHANNEL(10, 5, AD7193_CH_AIN5),
	AD7193_CHANNEL(11, 6, AD7193_CH_AIN6),
	AD7193_CHANNEL(12, 7, AD7193_CH_AIN7),
	AD7193_CHANNEL(13, 8, AD7193_CH_AIN8),
	IIO_CHAN_SOFT_TIMESTAMP(14),
};

Kind regards,
Alisa-Dariana Roman