linux-kernel - Re: [PATCH v3 6/6] iio: bmg160: Add SPI driver

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Date:	Mon, 17 Aug 2015 08:41:36 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Peter Meerwald <pmeerw@...erw.net>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Vlad Dogaru <vlad.dogaru@...el.com>,
	Paul Bolle <pebolle@...cali.nl>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 6/6] iio: bmg160: Add SPI driver

Hi,

On Sat, Aug 15, 2015 at 04:03:24PM +0100, Jonathan Cameron wrote:
> On 12/08/15 16:19, Peter Meerwald wrote:
> > On Wed, 12 Aug 2015, Markus Pargmann wrote:
> > 
> >> Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
> > 
> > the spelling of Bosch is inconsistent, sometimes it is BOSCH, I'd prefer 
> > the former
> > 
> > please find a slightly more relevant comment below :)
> Another comment on the break up of modules you have here
> which is a bit odd and leads to two large modules instead
> of 1 large and 2 small (which I think would be preferable).

Thanks, I will fix that.

Best Regards,

Markus

> 
> Jonathan
> > 
> >> ---
> >>  drivers/iio/gyro/Kconfig      | 11 +++++++++
> >>  drivers/iio/gyro/Makefile     |  1 +
> >>  drivers/iio/gyro/bmg160_spi.c | 57 +++++++++++++++++++++++++++++++++++++++++++
> >>  3 files changed, 69 insertions(+)
> >>  create mode 100644 drivers/iio/gyro/bmg160_spi.c
> >>
> >> diff --git a/drivers/iio/gyro/Kconfig b/drivers/iio/gyro/Kconfig
> >> index 13f8e0051615..a77dbb0062fe 100644
> >> --- a/drivers/iio/gyro/Kconfig
> >> +++ b/drivers/iio/gyro/Kconfig
> >> @@ -71,6 +71,17 @@ config BMG160_I2C
> >>  	  This driver can also be built as a module.  If so, the module
> >>  	  will be called bmg160_i2c.
> >>  
> >> +config BMG160_SPI
> >> +	tristate "Driver for connection via SPI"
> >> +	depends on SPI
> >> +	select REGMAP_SPI
> >> +	help
> >> +	  Say yes here to build support for Bosch BMG160 Tri-axis Gyro Sensor
> >> +	  driver connected via SPI. This driver also supports BMI055 gyroscope.
> >> +
> >> +	  This driver can also be built as a module.  If so, the module
> >> +	  will be called bmg160_spi.
> >> +
> >>  endif
> >>  
> >>  config HID_SENSOR_GYRO_3D
> >> diff --git a/drivers/iio/gyro/Makefile b/drivers/iio/gyro/Makefile
> >> index 73b41e43a974..848e55c605c0 100644
> >> --- a/drivers/iio/gyro/Makefile
> >> +++ b/drivers/iio/gyro/Makefile
> >> @@ -9,6 +9,7 @@ obj-$(CONFIG_ADIS16136) += adis16136.o
> >>  obj-$(CONFIG_ADIS16260) += adis16260.o
> >>  obj-$(CONFIG_ADXRS450) += adxrs450.o
> >>  obj-$(CONFIG_BMG160_I2C) += bmg160_core.o bmg160_i2c.o
> >> +obj-$(CONFIG_BMG160_I2C) += bmg160_core.o bmg160_spi.o
> So if both are present (and most distros will build both) we will have
> the core stuff built twice?  I'd rather that was a separate module
> as is usually done for this sort of case.  See how the ST accelerometer
> driver does it (slightly more complex case)
> >>  
> >>  obj-$(CONFIG_HID_SENSOR_GYRO_3D) += hid-sensor-gyro-3d.o
> >>  
> >> diff --git a/drivers/iio/gyro/bmg160_spi.c b/drivers/iio/gyro/bmg160_spi.c
> >> new file mode 100644
> >> index 000000000000..8a358571b702
> >> --- /dev/null
> >> +++ b/drivers/iio/gyro/bmg160_spi.c
> >> @@ -0,0 +1,57 @@
> >> +#include <linux/spi/spi.h>
> >> +#include <linux/regmap.h>
> >> +#include <linux/iio/iio.h>
> >> +#include <linux/module.h>
> >> +
> >> +#include <bmg160.h>
> > 
> > I think this should be
> > #include "bmg160.h"
> > as in the _i2c part of the driver
> > 
> >> +
> >> +static const struct regmap_config bmg160_regmap_spi_conf = {
> >> +	.reg_bits = 8,
> >> +	.val_bits = 8,
> >> +	.max_register = 0x3f,
> >> +};
> >> +
> >> +static int bmg160_spi_probe(struct spi_device *spi)
> >> +{
> >> +	struct regmap *regmap;
> >> +	const struct spi_device_id *id = spi_get_device_id(spi);
> >> +
> >> +	regmap = devm_regmap_init_spi(spi, &bmg160_regmap_spi_conf);
> >> +	if (IS_ERR(regmap)) {
> >> +		dev_err(&spi->dev, "Failed to register spi regmap %d\n",
> >> +			(int)PTR_ERR(regmap));
> >> +		return PTR_ERR(regmap);
> >> +	}
> >> +
> >> +	return bmg160_core_probe(&spi->dev, regmap, spi->irq, id->name);
> >> +}
> >> +
> >> +static int bmg160_spi_remove(struct spi_device *spi)
> >> +{
> >> +	bmg160_core_remove(&spi->dev);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +static const struct spi_device_id bmg160_spi_id[] = {
> >> +	{"bmg160", 0},
> >> +	{"bmi055_gyro", 0},
> >> +	{}
> >> +};
> >> +
> >> +MODULE_DEVICE_TABLE(spi, bmg160_spi_id);
> >> +
> >> +static struct spi_driver bmg160_spi_driver = {
> >> +	.driver = {
> >> +		.name	= "bmg160_spi",
> >> +		.pm	= &bmg160_pm_ops,
> >> +	},
> >> +	.probe		= bmg160_spi_probe,
> >> +	.remove		= bmg160_spi_remove,
> >> +	.id_table	= bmg160_spi_id,
> >> +};
> >> +module_spi_driver(bmg160_spi_driver);
> >> +
> >> +MODULE_AUTHOR("Markus Pargmann <mpa@...gutronix.de>");
> >> +MODULE_LICENSE("GPL v2");
> >> +MODULE_DESCRIPTION("BMG160 SPI Gyro driver");
> >>
> > 
> 
> 

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