linux-kernel - RE: [PATCH v3 3/3] iio: imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR

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Date:   Thu, 11 Jul 2019 11:00:27 +0000
From:   Vitor Soares <Vitor.Soares@...opsys.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Vitor Soares <Vitor.Soares@...opsys.com>
CC:     "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "bbrezillon@...rnel.org" <bbrezillon@...rnel.org>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>
Subject: RE: [PATCH v3 3/3] iio: imu: st_lsm6dsx: add i3c basic support for
 LSM6DSO and LSM6DSR

From: Vitor Soares <soares@...opsys.com>
Date: Thu, Jul 11, 2019 at 11:12:34

> Hi Lorenzo,
> 
> From: Lorenzo Bianconi <lorenzo@...nel.org>
> Date: Wed, Jul 10, 2019 at 20:44:05
> 
> > > For today the st_lsm6dsx driver support LSM6DSO and LSM6DSR sensor only in
> > > spi and i2c mode.
> > > 
> > > The LSM6DSO and LSM6DSR are also i3c capable so lets give i3c support to
> > > them.
> > 
> > Hi Vitor,
> > 
> > just few comments inline.
> > 
> > Regards,
> > Lorenzo
> > 
> > > 
> > > Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
> > > Acked-by: Lorenzo Bianconi <lorenzo@...nel.org>
> > > ---
> > > Changes in v3:
> > >   Remove unnecessary st_lsm6dsx_i3c_data table used to hold device name
> > >   Use st_lsm6dsx_probe new form
> > > 
> > > Changes in v2:
> > >   Add support for LSM6DSR
> > >   Set pm_ops to st_lsm6dsx_pm_ops
> > > 
> > >  drivers/iio/imu/st_lsm6dsx/Kconfig          |  8 +++-
> > >  drivers/iio/imu/st_lsm6dsx/Makefile         |  1 +
> > >  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c | 61 +++++++++++++++++++++++++++++
> > >  3 files changed, 69 insertions(+), 1 deletion(-)
> > >  create mode 100644 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c
> > > 
> > 
> > [...]
> > > +static int st_lsm6dsx_i3c_probe(struct i3c_device *i3cdev)
> > > +{
> > > +	const struct i3c_device_id *id = i3c_device_match_id(i3cdev,
> > > +							    st_lsm6dsx_i3c_ids);
> > 
> > i3c_device_match_id can theoretically fail so is it better to check
> > return value here? (maybe I am too paranoid :))

I was preparing the patch and if the i3c_device_match_id() fail it return 
NULL so the st_lsm6dsx_probe() will fail automatically.
Checking the spi_get_device_id(), the drivers don't test the return value 
too.

Do you think it is really necessary to test it before the 
st_lsm6dsx_probe() function?

Best regards,
Vitor Soares