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Date:   Wed, 20 Feb 2019 17:24:39 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Song Qiang <songqiang1304521@...il.com>,
        letux-kernel@...nphoenux.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] iio: magnetometer: hmc5843: add mount matrix support


> Am 20.02.2019 um 17:19 schrieb Jonathan Cameron <jic23@...nel.org>:
> 
> On Wed, 20 Feb 2019 15:00:56 +0100
> "H. Nikolaus Schaller" <hns@...delico.com> wrote:
> 
>> This patch allows to read a mount-matrix device tree
>> property and report to user-space or in-kernel iio
>> clients.
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> The rest of these are all fine, though I suggest considering
> a local variable rather than the fiddly bit of casting.

Ok, fine.

I will wait some days for further comments than then
submit a v2 with all known improvements.

BR and thanks,
Nikolaus

> 
> Jonathan
>> ---
>> drivers/iio/magnetometer/hmc5843.h      |  1 +
>> drivers/iio/magnetometer/hmc5843_core.c | 14 ++++++++++++++
>> 2 files changed, 15 insertions(+)
>> 
>> diff --git a/drivers/iio/magnetometer/hmc5843.h b/drivers/iio/magnetometer/hmc5843.h
>> index a75224cf99df..e3e22d2508d3 100644
>> --- a/drivers/iio/magnetometer/hmc5843.h
>> +++ b/drivers/iio/magnetometer/hmc5843.h
>> @@ -43,6 +43,7 @@ struct hmc5843_data {
>> 	struct mutex lock;
>> 	struct regmap *regmap;
>> 	const struct hmc5843_chip_info *variant;
>> +	struct iio_mount_matrix orientation;
>> 	__be16 buffer[8];
>> };
>> 
>> diff --git a/drivers/iio/magnetometer/hmc5843_core.c b/drivers/iio/magnetometer/hmc5843_core.c
>> index ada142fb7aa3..e6b6da70c152 100644
>> --- a/drivers/iio/magnetometer/hmc5843_core.c
>> +++ b/drivers/iio/magnetometer/hmc5843_core.c
>> @@ -237,6 +237,13 @@ int hmc5843_set_measurement_configuration(struct iio_dev *indio_dev,
>> 	return hmc5843_set_meas_conf(data, meas_conf);
>> }
>> 
>> +static const struct iio_mount_matrix *
>> +hmc5843_get_mount_matrix(const struct iio_dev *indio_dev,
>> +			  const struct iio_chan_spec *chan)
>> +{
>> +	return &((struct hmc5843_data *)iio_priv(indio_dev))->orientation;
>> +}
>> +
>> static const struct iio_enum hmc5843_meas_conf_enum = {
>> 	.items = hmc5843_meas_conf_modes,
>> 	.num_items = ARRAY_SIZE(hmc5843_meas_conf_modes),
>> @@ -247,6 +254,7 @@ static const struct iio_enum hmc5843_meas_conf_enum = {
>> static const struct iio_chan_spec_ext_info hmc5843_ext_info[] = {
>> 	IIO_ENUM("meas_conf", true, &hmc5843_meas_conf_enum),
>> 	IIO_ENUM_AVAILABLE("meas_conf", &hmc5843_meas_conf_enum),
>> +	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
>> 	{ },
>> };
>> 
>> @@ -260,6 +268,7 @@ static const struct iio_enum hmc5983_meas_conf_enum = {
>> static const struct iio_chan_spec_ext_info hmc5983_ext_info[] = {
>> 	IIO_ENUM("meas_conf", true, &hmc5983_meas_conf_enum),
>> 	IIO_ENUM_AVAILABLE("meas_conf", &hmc5983_meas_conf_enum),
>> +	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, hmc5843_get_mount_matrix),
>> 	{ },
>> };
>> 
>> @@ -635,6 +644,11 @@ int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
>> 	data->variant = &hmc5843_chip_info_tbl[id];
>> 	mutex_init(&data->lock);
>> 
>> +	ret = of_iio_read_mount_matrix(dev, "mount-matrix",
>> +				&data->orientation);
>> +	if (ret)
>> +		return ret;
>> +
>> 	indio_dev->dev.parent = dev;
>> 	indio_dev->name = name;
>> 	indio_dev->info = &hmc5843_info;
> 

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