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

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Date:   Sun, 18 Oct 2020 21:05:49 +0530
From:   Vaishnav M A <vaishnav@...gleboard.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Drew Fustini <drew@...gleboard.org>,
        Robert Nelson <robertcnelson@...gleboard.org>,
        Ivan Rajković <rajkovic@...roe.com>
Subject: Re: [PATCH v2] iio: proximity: as3935 change of_property_read to device_property_read

On Sun, Oct 18, 2020 at 4:47 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> 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
>
Sorry for missing that, happy to see this change.

Thanks,
Vaishnav M A
> 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,
>