linux-kernel - Re: [PATCH v2 1/5] iio: adc: ad7780: define/use own IIO channel macros

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Date:   Sat, 21 Mar 2020 16:50:53 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lars@...afoo.de>
Subject: Re: [PATCH v2 1/5] iio: adc: ad7780: define/use own IIO channel
 macros

On Sat, 21 Mar 2020 11:07:58 +0200
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> This change gets rid of the AD_SD_*_CHANNEL macros in favor of defining
> it's own. The ad7780 is quite simpler than it's other Sigma-Delta brothers.
> 
> It turned out that centralizing the AD_SD_*_CHANNEL macros doesn't scale
> too well, especially with some more complicated drivers. Some of the
> variations in the more complicated drivers require new macros, and that way
> things can become harder to maintain.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>

Applied to the togreg branch of iio.git and pushed out as testing.

Thanks,

Jonathan

> ---
> 
> Changelog v1 -> v2:
> * re-send + change author @analog.com; GMail messed it up
> 
>  drivers/iio/adc/ad7780.c | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
> index 291c1a898129..f47606ebbbbe 100644
> --- a/drivers/iio/adc/ad7780.c
> +++ b/drivers/iio/adc/ad7780.c
> @@ -206,10 +206,29 @@ static const struct ad_sigma_delta_info ad7780_sigma_delta_info = {
>  	.irq_flags = IRQF_TRIGGER_LOW,
>  };
>  
> -#define AD7780_CHANNEL(bits, wordsize) \
> -	AD_SD_CHANNEL(1, 0, 0, bits, 32, (wordsize) - (bits))
> -#define AD7170_CHANNEL(bits, wordsize) \
> -	AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, (wordsize) - (bits))
> +#define _AD7780_CHANNEL(_bits, _wordsize, _mask_all)		\
> +{								\
> +	.type = IIO_VOLTAGE,					\
> +	.indexed = 1,						\
> +	.channel = 0,						\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |		\
> +		BIT(IIO_CHAN_INFO_OFFSET),			\
> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
> +	.info_mask_shared_by_all = _mask_all,			\
> +	.scan_index = 1,					\
> +	.scan_type = {						\
> +		.sign = 'u',					\
> +		.realbits = (_bits),				\
> +		.storagebits = 32,				\
> +		.shift = (_wordsize) - (_bits),			\
> +		.endianness = IIO_BE,				\
> +	},							\
> +}
> +
> +#define AD7780_CHANNEL(_bits, _wordsize)	\
> +	_AD7780_CHANNEL(_bits, _wordsize, BIT(IIO_CHAN_INFO_SAMP_FREQ))
> +#define AD7170_CHANNEL(_bits, _wordsize)	\
> +	_AD7780_CHANNEL(_bits, _wordsize, 0)
>  
>  static const struct ad7780_chip_info ad7780_chip_info_tbl[] = {
>  	[ID_AD7170] = {