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iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver

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Add SPI driver for InvenSense ICM-426xxx devices.

Configure bus signal slew rates as indicated in the datasheet.

Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jean-Baptiste Maneyrol 2020-06-22 17:37:19 +02:00 committed by Jonathan Cameron
parent 7297ef1e26
commit 9f9ff91b77
1 changed files with 99 additions and 0 deletions
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99
drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020 InvenSense, Inc.
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/property.h>
#include "inv_icm42600.h"
static int inv_icm42600_spi_bus_setup(struct inv_icm42600_state *st)
{
unsigned int mask, val;
int ret;
/* setup interface registers */
val = INV_ICM42600_INTF_CONFIG6_I3C_EN |
INV_ICM42600_INTF_CONFIG6_I3C_SDR_EN |
INV_ICM42600_INTF_CONFIG6_I3C_DDR_EN;
ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6,
INV_ICM42600_INTF_CONFIG6_MASK, val);
if (ret)
return ret;
ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0);
if (ret)
return ret;
/* set slew rates for I2C and SPI */
mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK |
INV_ICM42600_DRIVE_CONFIG_SPI_MASK;
val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_20_60NS) |
INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_INF_2NS);
ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG,
mask, val);
if (ret)
return ret;
/* disable i2c bus */
return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK,
INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS);
}
static int inv_icm42600_probe(struct spi_device *spi)
{
const void *match;
enum inv_icm42600_chip chip;
struct regmap *regmap;
match = device_get_match_data(&spi->dev);
if (!match)
return -EINVAL;
chip = (enum inv_icm42600_chip)match;
regmap = devm_regmap_init_spi(spi, &inv_icm42600_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return inv_icm42600_core_probe(regmap, chip, inv_icm42600_spi_bus_setup);
}
static const struct of_device_id inv_icm42600_of_matches[] = {
{
.compatible = "invensense,icm42600",
.data = (void *)INV_CHIP_ICM42600,
}, {
.compatible = "invensense,icm42602",
.data = (void *)INV_CHIP_ICM42602,
}, {
.compatible = "invensense,icm42605",
.data = (void *)INV_CHIP_ICM42605,
}, {
.compatible = "invensense,icm42622",
.data = (void *)INV_CHIP_ICM42622,
},
{}
};
MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches);
static struct spi_driver inv_icm42600_driver = {
.driver = {
.name = "inv-icm42600-spi",
.of_match_table = inv_icm42600_of_matches,
.pm = &inv_icm42600_pm_ops,
},
.probe = inv_icm42600_probe,
};
module_spi_driver(inv_icm42600_driver);
MODULE_AUTHOR("InvenSense, Inc.");
MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
MODULE_LICENSE("GPL");