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    Subject[PATCH v2 03/12] iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver
    Date
    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>
    ---
    .../iio/imu/inv_icm42600/inv_icm42600_spi.c | 99 +++++++++++++++++++
    1 file changed, 99 insertions(+)
    create mode 100644 drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c

    diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
    new file mode 100644
    index 000000000000..a9c5e2fdbe2a
    --- /dev/null
    +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
    @@ -0,0 +1,99 @@
    +// 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");
    --
    2.17.1
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