linux-kernel - Re: [PATCH v4 4/8] iio: adc: max1027: Prepare the introduction of different resolutions

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Message-ID: <20191012122912.5882d2e7@archlinux>
Date:   Sat, 12 Oct 2019 12:29:12 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v4 4/8] iio: adc: max1027: Prepare the introduction of
 different resolutions

On Fri, 11 Oct 2019 16:43:43 +0200
Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> Maxim's max1027/29/31 series returns the measured voltages with a
> resolution of 10 bits. There is a very similar series, max1227/29/31
> which works identically but uses a resolution of 12 bits. Prepare the
> support for these chips by turning the 'depth' into a macro parameter
> instead of hardcoding it everywhere. Also reorganize just a bit the
> macros at the top to avoid repeating tens of lines when adding support
> for a new chip.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Applied.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/max1027.c | 74 +++++++++++++++++----------------------
>  1 file changed, 32 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> index f9b473ee6711..8b449044bef5 100644
> --- a/drivers/iio/adc/max1027.c
> +++ b/drivers/iio/adc/max1027.c
> @@ -83,7 +83,7 @@ static const struct of_device_id max1027_adc_dt_ids[] = {
>  MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
>  #endif
>  
> -#define MAX1027_V_CHAN(index)						\
> +#define MAX1027_V_CHAN(index, depth)					\
>  	{								\
>  		.type = IIO_VOLTAGE,					\
>  		.indexed = 1,						\
> @@ -93,7 +93,7 @@ MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
>  		.scan_index = index + 1,				\
>  		.scan_type = {						\
>  			.sign = 'u',					\
> -			.realbits = 10,					\
> +			.realbits = depth,				\
>  			.storagebits = 16,				\
>  			.shift = 2,					\
>  			.endianness = IIO_BE,				\
> @@ -115,52 +115,42 @@ MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
>  		},							\
>  	}
>  
> +#define MAX1X27_CHANNELS(depth)			\
> +	MAX1027_T_CHAN,				\
> +	MAX1027_V_CHAN(0, depth),		\
> +	MAX1027_V_CHAN(1, depth),		\
> +	MAX1027_V_CHAN(2, depth),		\
> +	MAX1027_V_CHAN(3, depth),		\
> +	MAX1027_V_CHAN(4, depth),		\
> +	MAX1027_V_CHAN(5, depth),		\
> +	MAX1027_V_CHAN(6, depth),		\
> +	MAX1027_V_CHAN(7, depth)
> +
> +#define MAX1X29_CHANNELS(depth)			\
> +	MAX1X27_CHANNELS(depth),		\
> +	MAX1027_V_CHAN(8, depth),		\
> +	MAX1027_V_CHAN(9, depth),		\
> +	MAX1027_V_CHAN(10, depth),		\
> +	MAX1027_V_CHAN(11, depth)
> +
> +#define MAX1X31_CHANNELS(depth)			\
> +	MAX1X27_CHANNELS(depth),		\
> +	MAX1X29_CHANNELS(depth),		\
> +	MAX1027_V_CHAN(12, depth),		\
> +	MAX1027_V_CHAN(13, depth),		\
> +	MAX1027_V_CHAN(14, depth),		\
> +	MAX1027_V_CHAN(15, depth)
> +
>  static const struct iio_chan_spec max1027_channels[] = {
> -	MAX1027_T_CHAN,
> -	MAX1027_V_CHAN(0),
> -	MAX1027_V_CHAN(1),
> -	MAX1027_V_CHAN(2),
> -	MAX1027_V_CHAN(3),
> -	MAX1027_V_CHAN(4),
> -	MAX1027_V_CHAN(5),
> -	MAX1027_V_CHAN(6),
> -	MAX1027_V_CHAN(7)
> +	MAX1X27_CHANNELS(10),
>  };
>  
>  static const struct iio_chan_spec max1029_channels[] = {
> -	MAX1027_T_CHAN,
> -	MAX1027_V_CHAN(0),
> -	MAX1027_V_CHAN(1),
> -	MAX1027_V_CHAN(2),
> -	MAX1027_V_CHAN(3),
> -	MAX1027_V_CHAN(4),
> -	MAX1027_V_CHAN(5),
> -	MAX1027_V_CHAN(6),
> -	MAX1027_V_CHAN(7),
> -	MAX1027_V_CHAN(8),
> -	MAX1027_V_CHAN(9),
> -	MAX1027_V_CHAN(10),
> -	MAX1027_V_CHAN(11)
> +	MAX1X29_CHANNELS(10),
>  };
>  
>  static const struct iio_chan_spec max1031_channels[] = {
> -	MAX1027_T_CHAN,
> -	MAX1027_V_CHAN(0),
> -	MAX1027_V_CHAN(1),
> -	MAX1027_V_CHAN(2),
> -	MAX1027_V_CHAN(3),
> -	MAX1027_V_CHAN(4),
> -	MAX1027_V_CHAN(5),
> -	MAX1027_V_CHAN(6),
> -	MAX1027_V_CHAN(7),
> -	MAX1027_V_CHAN(8),
> -	MAX1027_V_CHAN(9),
> -	MAX1027_V_CHAN(10),
> -	MAX1027_V_CHAN(11),
> -	MAX1027_V_CHAN(12),
> -	MAX1027_V_CHAN(13),
> -	MAX1027_V_CHAN(14),
> -	MAX1027_V_CHAN(15)
> +	MAX1X31_CHANNELS(10),
>  };
>  
>  static const unsigned long max1027_available_scan_masks[] = {
> @@ -284,7 +274,7 @@ static int max1027_read_raw(struct iio_dev *indio_dev,
>  			break;
>  		case IIO_VOLTAGE:
>  			*val = 2500;
> -			*val2 = 10;
> +			*val2 = chan->scan_type.realbits;
>  			ret = IIO_VAL_FRACTIONAL_LOG2;
>  			break;
>  		default: