linux-kernel - Re: [PATCH v3 5/7] iio: imu: adis16480: Deal with filter freq in a generic way

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Date:   Sun, 3 Mar 2019 12:52:05 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Stefan Popa <stefan.popa@...log.com>
Cc:     <robh+dt@...nel.org>, <Michael.Hennerich@...log.com>,
        <knaack.h@....de>, <lars@...afoo.de>, <pmeerw@...erw.net>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] iio: imu: adis16480: Deal with filter freq in a
 generic way

On Wed, 27 Feb 2019 18:14:26 +0200
Stefan Popa <stefan.popa@...log.com> wrote:

> When setting the filter frequency, the driver looks into the
> adis16480_def_filter_freqs table for the best match. Pass this table to
> the chip_info struct since future devices will need to use a different
> table.
> 
> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/imu/adis16480.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
> index 92abc95..c90375d 100644
> --- a/drivers/iio/imu/adis16480.c
> +++ b/drivers/iio/imu/adis16480.c
> @@ -127,6 +127,7 @@ struct adis16480_chip_info {
>  	unsigned int temp_scale;
>  	unsigned int int_clk;
>  	unsigned int max_dec_rate;
> +	const unsigned int *filter_freqs;
>  };
>  
>  enum adis16480_int_pin {
> @@ -483,7 +484,7 @@ static int adis16480_get_filter_freq(struct iio_dev *indio_dev,
>  	if (!(val & enable_mask))
>  		*freq = 0;
>  	else
> -		*freq = adis16480_def_filter_freqs[(val >> offset) & 0x3];
> +		*freq = st->chip_info->filter_freqs[(val >> offset) & 0x3];
>  
>  	return IIO_VAL_INT;
>  }
> @@ -510,10 +511,10 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
>  		val &= ~enable_mask;
>  	} else {
>  		best_freq = 0;
> -		best_diff = 310;
> +		best_diff = st->chip_info->filter_freqs[0];
>  		for (i = 0; i < ARRAY_SIZE(adis16480_def_filter_freqs); i++) {
> -			if (adis16480_def_filter_freqs[i] >= freq) {
> -				diff = adis16480_def_filter_freqs[i] - freq;
> +			if (st->chip_info->filter_freqs[i] >= freq) {
> +				diff = st->chip_info->filter_freqs[i] - freq;
>  				if (diff < best_diff) {
>  					best_diff = diff;
>  					best_freq = i;
> @@ -730,6 +731,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
>  		.temp_scale = 5650, /* 5.65 milli degree Celsius */
>  		.int_clk = 2460000,
>  		.max_dec_rate = 2048,
> +		.filter_freqs = adis16480_def_filter_freqs,
>  	},
>  	[ADIS16480] = {
>  		.channels = adis16480_channels,
> @@ -741,6 +743,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
>  		.temp_scale = 5650, /* 5.65 milli degree Celsius */
>  		.int_clk = 2460000,
>  		.max_dec_rate = 2048,
> +		.filter_freqs = adis16480_def_filter_freqs,
>  	},
>  	[ADIS16485] = {
>  		.channels = adis16485_channels,
> @@ -752,6 +755,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
>  		.temp_scale = 5650, /* 5.65 milli degree Celsius */
>  		.int_clk = 2460000,
>  		.max_dec_rate = 2048,
> +		.filter_freqs = adis16480_def_filter_freqs,
>  	},
>  	[ADIS16488] = {
>  		.channels = adis16480_channels,
> @@ -763,6 +767,7 @@ static const struct adis16480_chip_info adis16480_chip_info[] = {
>  		.temp_scale = 5650, /* 5.65 milli degree Celsius */
>  		.int_clk = 2460000,
>  		.max_dec_rate = 2048,
> +		.filter_freqs = adis16480_def_filter_freqs,
>  	},
>  };
>