linux-kernel - Re: [RFC PATCH 2/2] iio: pressure: bmp280: convert to i2c's .probe

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Date:   Sat, 5 Nov 2022 14:54:31 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Angel Iglesias <ang.iglesiasg@...il.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-iio@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Nuno Sá <noname.nuno@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Paul Cercueil <paul@...pouillou.net>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] iio: pressure: bmp280: convert to i2c's
 .probe_new()

On Wed, 02 Nov 2022 01:16:44 +0100
Angel Iglesias <ang.iglesiasg@...il.com> wrote:

> On Tue, 2022-11-01 at 22:52 +0100, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Sun, Oct 30, 2022 at 06:53:11PM +0100, Angel Iglesias wrote:  
> > > Use i2c_client_get_device_id() to get the i2c_device_id* parameter in the
> > > .new_probe() callback.
> > > 
> > > Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>
> > > ---
> > >  drivers/iio/pressure/bmp280-i2c.c | 8 ++++----
> > >  1 file changed, 4 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/drivers/iio/pressure/bmp280-i2c.c
> > > b/drivers/iio/pressure/bmp280-i2c.c
> > > index 0c27211f3ea0..20073b09b3e3 100644
> > > --- a/drivers/iio/pressure/bmp280-i2c.c
> > > +++ b/drivers/iio/pressure/bmp280-i2c.c
> > > @@ -5,11 +5,11 @@
> > >  
> > >  #include "bmp280.h"
> > >  
> > > -static int bmp280_i2c_probe(struct i2c_client *client,
> > > -                           const struct i2c_device_id *id)
> > > +static int bmp280_i2c_probe(struct i2c_client *client)
> > >  {
> > > -       struct regmap *regmap;
> > > +       const struct i2c_device_id *id = i2c_client_get_device_id(client);
> > >         const struct regmap_config *regmap_config;
> > > +       struct regmap *regmap;
> > >  
> > >         switch (id->driver_data) {
> > >         case BMP180_CHIP_ID:  
> > 
> > What is the motivation for moving regmap? I thought reverse christmas
> > tree is only a thing in network code? I would have left the regmap
> > declaration where it is.  
> 
> Long story short, I worked previously on a small refactor of this driver to add
> support for a new family of sensors. During the different iterations of the
> patchset, one thing that was agreed was unifying the driver coding style to
> reverse xmas tree. For some extra context, here's the thread:
> https://lore.kernel.org/all/20220814145249.701f1261@jic23-huawei/

Not something I feel strongly enough about either way, but has benefit of
consistency. However, it's an unrelated change in this patch, so drop it
to avoid the noise in a patch where you have more significant changes.

Jonathan

> 
> > > @@ -65,7 +65,7 @@ static struct i2c_driver bmp280_i2c_driver = {
> > >                 .of_match_table = bmp280_of_i2c_match,
> > >                 .pm = pm_ptr(&bmp280_dev_pm_ops),
> > >         },
> > > -       .probe          = bmp280_i2c_probe,
> > > +       .probe_new      = bmp280_i2c_probe,
> > >         .id_table       = bmp280_i2c_id,
> > >  };
> > >  module_i2c_driver(bmp280_i2c_driver);  
> > 
> > Best regards
> > Uwe
> >   
> Kind regards
> Angel