That is a good point. That register should be set in case chip get confused if the spi signal mimic a I2C signal
Ge
> On Feb 2, 2016, at 10:31 PM, Lucas De Marchi <lucas.de.marchi@xxxxxxxxx> wrote:
>
> Hi Adriana,
>
>> On Tue, Feb 2, 2016 at 1:02 PM, Adriana Reus <adriana.reus@xxxxxxxxx> wrote:
>> The only difference between the MPU6000 and the
>> MPU6050 is that the first also supports SPI.
>> Add SPI driver for this chip.
>>
>> Signed-off-by: Adriana Reus <adriana.reus@xxxxxxxxx>
>> ---
>> Changes since initial version:
>> * Modified Kconfig so that the SPI component selects the core component
>> instead of the other way around.
>>
>> drivers/iio/imu/inv_mpu6050/Kconfig | 7 +++
>> drivers/iio/imu/inv_mpu6050/Makefile | 3 ++
>> drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 1 +
>> drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c | 80 +++++++++++++++++++++++++++++++
>> 4 files changed, 91 insertions(+)
>> create mode 100644 drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
>>
>> diff --git a/drivers/iio/imu/inv_mpu6050/Kconfig b/drivers/iio/imu/inv_mpu6050/Kconfig
>> index 483f52d..6f6a419 100644
>> --- a/drivers/iio/imu/inv_mpu6050/Kconfig
>> +++ b/drivers/iio/imu/inv_mpu6050/Kconfig
>> @@ -25,3 +25,10 @@ config INV_MPU6050_I2C
>> This driver can be built as a module. The module will be called
>> inv-mpu6050-i2c.
>>
>> +config INV_MPU6050_SPI
>> + tristate "Invensense MPU6050 devices"
>> + select INV_MPU6050_IIO
>> + select REGMAP_SPI
>> + help
>> + This driver can be built as a module. The module will be called
>> + inv-mpu6050-spi.
>> diff --git a/drivers/iio/imu/inv_mpu6050/Makefile b/drivers/iio/imu/inv_mpu6050/Makefile
>> index ca4941d..734af5e 100644
>> --- a/drivers/iio/imu/inv_mpu6050/Makefile
>> +++ b/drivers/iio/imu/inv_mpu6050/Makefile
>> @@ -7,3 +7,6 @@ inv-mpu6050-objs := inv_mpu_core.o inv_mpu_ring.o inv_mpu_trigger.o
>>
>> obj-$(CONFIG_INV_MPU6050_I2C) += inv-mpu6050-i2c.o
>> inv-mpu6050-i2c-objs := inv_mpu_i2c.o inv_mpu_acpi.o
>> +
>> +obj-$(CONFIG_INV_MPU6050_SPI) += inv-mpu6050-spi.o
>> +inv-mpu6050-spi-objs := inv_mpu_spi.o
>> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
>> index af406a3..758fe2b 100644
>> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
>> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
>> @@ -62,6 +62,7 @@ struct inv_mpu6050_reg_map {
>> enum inv_devices {
>> INV_MPU6050,
>> INV_MPU6500,
>> + INV_MPU6000,
>> INV_NUM_PARTS
>> };
>>
>> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
>> new file mode 100644
>> index 0000000..484171e
>> --- /dev/null
>> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
>> @@ -0,0 +1,80 @@
>> +/*
>> +* Copyright (C) 2015 Intel Corporation Inc.
>> +*
>> +* This software is licensed under the terms of the GNU General Public
>> +* License version 2, as published by the Free Software Foundation, and
>> +* may be copied, distributed, and modified under those terms.
>> +*
>> +* This program is distributed in the hope that it will be useful,
>> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
>> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> +* GNU General Public License for more details.
>> +*/
>> +#include <linux/module.h>
>> +#include <linux/acpi.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/regmap.h>
>> +#include <linux/iio/iio.h>
>> +#include "inv_mpu_iio.h"
>> +
>> +static const struct regmap_config inv_mpu_regmap_config = {
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> +};
>> +
>> +static int inv_mpu_probe(struct spi_device *spi)
>> +{
>> + struct regmap *regmap;
>> + const struct spi_device_id *id = spi_get_device_id(spi);
>> + const char *name = id ? id->name : NULL;
>> +
>> + regmap = devm_regmap_init_spi(spi, &inv_mpu_regmap_config);
>> + if (IS_ERR(regmap)) {
>> + dev_err(&spi->dev, "Failed to register spi regmap %d\n",
>> + (int)PTR_ERR(regmap));
>> + return PTR_ERR(regmap);
>> + }
>> +
>> + return inv_mpu_core_probe(regmap, spi->irq, name);
>
> I think there's still some spi-only initialization missing. As per
> datasheet we should disable the I2C interface when using the SPI
> interface.
>
> Lucas De Marchi
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