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

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Message-ID: <20200519185711.00003308@Huawei.com>
Date:   Tue, 19 May 2020 18:57:11 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Jonathan Albrieux <jonathan.albrieux@...il.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, 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



> ---
>  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;