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.
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
>
