linux-kernel - Re: [PATCH 2/2] staging: iio: adc: ad7192: Convert platform data to DT properties

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Date:   Sat, 16 Mar 2019 16:56:58 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mircea Caprioru <mircea.caprioru@...log.com>
Cc:     <Michael.Hennerich@...log.com>, <stefan.popa@...log.com>,
        <lars@...afoo.de>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
Subject: Re: [PATCH 2/2] staging: iio: adc: ad7192: Convert platform data to
 DT properties

On Fri, 15 Mar 2019 13:29:03 +0200
Mircea Caprioru <mircea.caprioru@...log.com> wrote:

> This patch will remove platform data members and replace them with device
> tree properties. These properties will be subject to further modifications
> and probably replaced with other functionalities at some point in time.

From the description I was initially thinking this would be a crazy
temporary binding but as they all seem to be reasonably sensible
(even if we haven't formally reviewed the binding yet so they may change)
I'm happy to take this as a step in the right direction.

> 
> Signed-off-by: Mircea Caprioru <mircea.caprioru@...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/staging/iio/adc/ad7192.c | 33 ++++++++++++++++++++------------
>  drivers/staging/iio/adc/ad7192.h |  7 -------
>  2 files changed, 21 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
> index 5c54ce380fa5..c56eaefbbe41 100644
> --- a/drivers/staging/iio/adc/ad7192.c
> +++ b/drivers/staging/iio/adc/ad7192.c
> @@ -250,10 +250,11 @@ static int ad7192_of_clock_select(struct ad7192_state *st)
>  	return clock_sel;
>  }
>  
> -static int ad7192_setup(struct ad7192_state *st,
> -			const struct ad7192_platform_data *pdata)
> +static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
>  {
>  	struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
> +	bool rej60_en, sinc3_en, refin2_en, chop_en;
> +	bool buf_en, bipolar, burnout_curr_en;
>  	unsigned long long scale_uv;
>  	int i, ret, id;
>  
> @@ -280,18 +281,22 @@ static int ad7192_setup(struct ad7192_state *st,
>  
>  	st->conf = AD7192_CONF_GAIN(0);
>  
> -	if (pdata->rej60_en)
> +	rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable");
> +	if (rej60_en)
>  		st->mode |= AD7192_MODE_REJ60;
>  
> -	if (pdata->sinc3_en)
> +	sinc3_en = of_property_read_bool(np, "adi,sinc3-filter-enable");
> +	if (sinc3_en)
>  		st->mode |= AD7192_MODE_SINC3;
>  
> -	if (pdata->refin2_en && st->devid != ID_AD7195)
> +	refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable");
> +	if (refin2_en && st->devid != ID_AD7195)
>  		st->conf |= AD7192_CONF_REFSEL;
>  
> -	if (pdata->chop_en) {
> +	chop_en = of_property_read_bool(np, "adi,chop-enable");
> +	if (chop_en) {
>  		st->conf |= AD7192_CONF_CHOP;
> -		if (pdata->sinc3_en)
> +		if (sinc3_en)
>  			st->f_order = 3; /* SINC 3rd order */
>  		else
>  			st->f_order = 4; /* SINC 4th order */
> @@ -299,15 +304,19 @@ static int ad7192_setup(struct ad7192_state *st,
>  		st->f_order = 1;
>  	}
>  
> -	if (pdata->buf_en)
> +	buf_en = of_property_read_bool(np, "adi,buffer-enable");
> +	if (buf_en)
>  		st->conf |= AD7192_CONF_BUF;
>  
> -	if (pdata->unipolar_en)
> +	bipolar = of_property_read_bool(np, "bipolar");
> +	if (!bipolar)
>  		st->conf |= AD7192_CONF_UNIPOLAR;
>  
> -	if (pdata->burnout_curr_en && pdata->buf_en && !pdata->chop_en) {
> +	burnout_curr_en = of_property_read_bool(np,
> +						"adi,burnout-currents-enable");
> +	if (burnout_curr_en && buf_en && !chop_en) {
>  		st->conf |= AD7192_CONF_BURN;
> -	} else if (pdata->burnout_curr_en) {
> +	} else if (burnout_curr_en) {
>  		dev_warn(&st->sd.spi->dev,
>  			 "Can't enable burnout currents: see CHOP or buffer\n");
>  	}
> @@ -735,7 +744,7 @@ static int ad7192_probe(struct spi_device *spi)
>  		}
>  	}
>  
> -	ret = ad7192_setup(st, pdata);
> +	ret = ad7192_setup(st, spi->dev.of_node);
>  	if (ret)
>  		goto error_disable_clk;
>  
> diff --git a/drivers/staging/iio/adc/ad7192.h b/drivers/staging/iio/adc/ad7192.h
> index 3be3ee269ed5..aa3322c14e38 100644
> --- a/drivers/staging/iio/adc/ad7192.h
> +++ b/drivers/staging/iio/adc/ad7192.h
> @@ -33,13 +33,6 @@
>  
>  struct ad7192_platform_data {
>  	u16		vref_mv;
> -	bool		refin2_en;
> -	bool		rej60_en;
> -	bool		sinc3_en;
> -	bool		chop_en;
> -	bool		buf_en;
> -	bool		unipolar_en;
> -	bool		burnout_curr_en;
>  };
>  
>  #endif /* IIO_ADC_AD7192_H_ */