linux-kernel - Re: [PATCH v2] iio: proximity: as3935 change of_property_read to device_property

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Date:   Sun, 18 Oct 2020 12:17:12 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Vaishnav M A <vaishnav@...gleboard.org>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        alexandru.ardelean@...log.com, linus.walleij@...aro.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        jkridner@...gleboard.org, drew@...gleboard.org,
        robertcnelson@...gleboard.org, rajkovic@...roe.com
Subject: Re: [PATCH v2] iio: proximity: as3935 change of_property_read to
 device_property_read

On Sun, 18 Oct 2020 08:47:32 +0530
Vaishnav M A <vaishnav@...gleboard.org> wrote:

A very similar change was made recently in
00fa493b9989 ("iio:proximity:as3935: Drop of_match_ptr and use generic fw accessors")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=00fa493b99894b930e431c05a9dba294c5189120

Review follows for reference as I wrote it before remembering the above!

> replace the of_property_read_u32 for reading
> the ams,tuning-capacitor-pf, ams,nflwdth properties with
> device_property_read_u32, allows the driver to get the properties
> information using the more generic device_property_* helpers and opens
> the possibility of passing the properties during platform instantiation
> of the device by a suitably populated struct property_entry

Please format this to aid readability.

Replace of_property_read_u32() with device_property_read_u32,
when reading the ams,tuning-capacitor-pf and ams,nflwdth properties.
This opens up the possibility of passing the properties during platform
instantiation of the device by a suitable populated struct property_entry.


As in your other patch, please add the header property.h.

> 
> Signed-off-by: Vaishnav M A <vaishnav@...gleboard.org>
> ---
>  v2:
> 	- fix commit message
>  drivers/iio/proximity/as3935.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c
> index c339e7339ec8..7e47ddf89a56 100644
> --- a/drivers/iio/proximity/as3935.c
> +++ b/drivers/iio/proximity/as3935.c
> @@ -355,7 +355,6 @@ static int as3935_probe(struct spi_device *spi)
>  	struct iio_dev *indio_dev;
>  	struct iio_trigger *trig;
>  	struct as3935_state *st;
> -	struct device_node *np = spi->dev.of_node;
>  	int ret;
>  
>  	/* Be sure lightning event interrupt is specified */
> @@ -374,7 +373,7 @@ static int as3935_probe(struct spi_device *spi)
>  	spi_set_drvdata(spi, indio_dev);
>  	mutex_init(&st->lock);
>  
> -	ret = of_property_read_u32(np,
> +	ret = device_property_read_u32(&spi->dev,
>  			"ams,tuning-capacitor-pf", &st->tune_cap);
>  	if (ret) {
>  		st->tune_cap = 0;
> @@ -390,7 +389,7 @@ static int as3935_probe(struct spi_device *spi)
>  		return -EINVAL;
>  	}
>  
> -	ret = of_property_read_u32(np,
> +	ret = device_property_read_u32(&spi->dev,
>  			"ams,nflwdth", &st->nflwdth_reg);
>  	if (!ret && st->nflwdth_reg > AS3935_NFLWDTH_MASK) {
>  		dev_err(&spi->dev,