linux-kernel - Re: [PATCH v2 4/4] iio: imu: bmi160: added mount-matrix support

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Date:   Wed, 20 May 2020 09:20:16 +0200
From:   Jonathan Albrieux <jonathan.albrieux@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v2 4/4] iio: imu: bmi160: added mount-matrix support

On Tue, May 19, 2020 at 06:57:11PM +0100, Jonathan Cameron wrote:
> On Tue, 19 May 2020 09:51:00 +0200
> Jonathan Albrieux <jonathan.albrieux@...il.com> wrote:
> 
> > Add mount-matrix binding support. As chip could have different orientations
> > a mount matrix support is needed to correctly translate these differences
> > 
> > Signed-off-by: Jonathan Albrieux <jonathan.albrieux@...il.com>
> Hi Jonathan,
> 
> Looks good to me. I'll pick this up once 1-3 are tidied up and
> we have a device tree review in for the binding doc.  I'm rubbish
> at reviewing those as Rob will certify so may well have missed something!
> 
> Jonathan
> 
>

Thank you! I'm going to work on suggestions now,

Best regards,
Jonathan Albrieux
 
> 
> > ---
> >  drivers/iio/imu/bmi160/bmi160.h      |  1 +
> >  drivers/iio/imu/bmi160/bmi160_core.c | 20 ++++++++++++++++++++
> >  2 files changed, 21 insertions(+)
> > 
> > diff --git a/drivers/iio/imu/bmi160/bmi160.h b/drivers/iio/imu/bmi160/bmi160.h
> > index 923c3b274fde..a82e040bd109 100644
> > --- a/drivers/iio/imu/bmi160/bmi160.h
> > +++ b/drivers/iio/imu/bmi160/bmi160.h
> > @@ -9,6 +9,7 @@ struct bmi160_data {
> >  	struct regmap *regmap;
> >  	struct iio_trigger *trig;
> >  	struct regulator_bulk_data supplies[2];
> > +	struct iio_mount_matrix orientation;
> >  };
> >  
> >  extern const struct regmap_config bmi160_regmap_config;
> > diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> > index 9bbe0d8e6720..78c8ca962359 100644
> > --- a/drivers/iio/imu/bmi160/bmi160_core.c
> > +++ b/drivers/iio/imu/bmi160/bmi160_core.c
> > @@ -110,6 +110,7 @@
> >  		.storagebits = 16,				\
> >  		.endianness = IIO_LE,				\
> >  	},							\
> > +	.ext_info = bmi160_ext_info,				\
> >  }
> >  
> >  /* scan indexes follow DATA register order */
> > @@ -265,6 +266,20 @@ static const struct  bmi160_odr_item bmi160_odr_table[] = {
> >  	},
> >  };
> >  
> > +static const struct iio_mount_matrix *
> > +bmi160_get_mount_matrix(const struct iio_dev *indio_dev,
> > +			const struct iio_chan_spec *chan)
> > +{
> > +	struct bmi160_data *data = iio_priv(indio_dev);
> > +
> > +	return &data->orientation;
> > +}
> > +
> > +static const struct iio_chan_spec_ext_info bmi160_ext_info[] = {
> > +	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmi160_get_mount_matrix),
> > +	{ }
> > +};
> > +
> >  static const struct iio_chan_spec bmi160_channels[] = {
> >  	BMI160_CHANNEL(IIO_ACCEL, X, BMI160_SCAN_ACCEL_X),
> >  	BMI160_CHANNEL(IIO_ACCEL, Y, BMI160_SCAN_ACCEL_Y),
> > @@ -840,6 +855,11 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
> >  		return ret;
> >  	}
> >  
> > +	ret = iio_read_mount_matrix(dev, "mount-matrix",
> > +				    &data->orientation);
> > +	if (ret)
> > +		return ret;
> > +
> >  	ret = bmi160_chip_init(data, use_spi);
> >  	if (ret)
> >  		return ret;
> 
>