On Mon, Sep 23, 2024 at 4:51 PM David Lechner <dlechner@xxxxxxxxxxxx> wrote:
>
> On Thu, Sep 19, 2024 at 3:04 PM Alexandru Ardelean
> <aardelean@xxxxxxxxxxxx> wrote:
> >
> > There are some newer additions to the AD7606 family, which support 18 bit
> > precision. Up until now, all chips were 16 bit.
> >
> > This change adds a 'bits' parameter to the AD760X_CHANNEL macro and renames
> > 'ad7606_channels' -> 'ad7606_channels_16bit' for the current devices.
> >
> > The AD7606_SW_CHANNEL() macro is also introduced, as a short-hand for IIO
> > channels in SW mode.
> >
> > Signed-off-by: Alexandru Ardelean <aardelean@xxxxxxxxxxxx>
> > ---
>
> ...
>
> > diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
> > index 6649e84d25de..204a343067e5 100644
> > --- a/drivers/iio/adc/ad7606.h
> > +++ b/drivers/iio/adc/ad7606.h
> > @@ -8,7 +8,7 @@
> > #ifndef IIO_ADC_AD7606_H_
> > #define IIO_ADC_AD7606_H_
> >
> > -#define AD760X_CHANNEL(num, mask_sep, mask_type, mask_all) { \
> > +#define AD760X_CHANNEL(num, mask_sep, mask_type, mask_all, bits) { \
> > .type = IIO_VOLTAGE, \
> > .indexed = 1, \
> > .channel = num, \
> > @@ -19,24 +19,26 @@
> > .scan_index = num, \
> > .scan_type = { \
> > .sign = 's', \
> > - .realbits = 16, \
> > - .storagebits = 16, \
> > + .realbits = (bits), \
> > + .storagebits = (bits) > 16 ? 32 : 16, \
> > .endianness = IIO_CPU, \
> > }, \
> > }
> >
> > #define AD7605_CHANNEL(num) \
> > AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW), \
> > - BIT(IIO_CHAN_INFO_SCALE), 0)
> > + BIT(IIO_CHAN_INFO_SCALE), 0, 16)
> >
> > -#define AD7606_CHANNEL(num) \
> > +#define AD7606_CHANNEL(num, bits) \
> > AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW), \
> > BIT(IIO_CHAN_INFO_SCALE), \
> > - BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
> > + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), bits)
> >
> > -#define AD7616_CHANNEL(num) \
> > +#define AD7606_SW_CHANNEL(num, bits) \
> > AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),\
> > - 0, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
> > + 0, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), bits)
> > +
> > +#define AD7616_CHANNEL(num) AD7606_SW_CHANNEL(num, 16)
>
> It looks like the AD7616_CHANNEL macro is no longer used, so can be
> dropped. Or alternately, don't change the lines below to use
> AD7606_SW_CHANNEL.
Well, the AD7616_CHANNEL() macro is still being used for the actual
AD7616 channels.
For the AD7606B software channels, the AD7616_CHANNEL() macro was
being re-used, which seemed like a bit of a lazy/convenient way to do
it.
The patch here, just cleans up that minor quirk, but just for AD7606B.
The AD7616 driver part, still uses the AD7616_CHANNEL() macro.
Though, interestingly, the AD7616_CHANNEL() macro is only used for SW channels.
Maybe in a subsequent patch, the AD7616_CHANNEL() macro can be removed
altogether.
I thought about doing it in this series, but decided against it, to
keep the series small.
>
> With either of those changes:
>
> Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>
>
> >
> > /**
> > * struct ad7606_chip_info - chip specific information
> > diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c
> > index 62ec12195307..e00f58a6a0e9 100644
> > --- a/drivers/iio/adc/ad7606_spi.c
> > +++ b/drivers/iio/adc/ad7606_spi.c
> > @@ -67,14 +67,14 @@ static const struct iio_chan_spec ad7616_sw_channels[] = {
> >
> > static const struct iio_chan_spec ad7606b_sw_channels[] = {
> > IIO_CHAN_SOFT_TIMESTAMP(8),
> > - AD7616_CHANNEL(0),
> > - AD7616_CHANNEL(1),
> > - AD7616_CHANNEL(2),
> > - AD7616_CHANNEL(3),
> > - AD7616_CHANNEL(4),
> > - AD7616_CHANNEL(5),
> > - AD7616_CHANNEL(6),
> > - AD7616_CHANNEL(7),
> > + AD7606_SW_CHANNEL(0, 16),
> > + AD7606_SW_CHANNEL(1, 16),
> > + AD7606_SW_CHANNEL(2, 16),
> > + AD7606_SW_CHANNEL(3, 16),
> > + AD7606_SW_CHANNEL(4, 16),
> > + AD7606_SW_CHANNEL(5, 16),
> > + AD7606_SW_CHANNEL(6, 16),
> > + AD7606_SW_CHANNEL(7, 16),
> > };
> >
> > static const unsigned int ad7606B_oversampling_avail[9] = {
> > --
> > 2.46.0
> >
