Commit 9f9ff91b authored by Jean-Baptiste Maneyrol's avatar Jean-Baptiste Maneyrol Committed by Jonathan Cameron
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iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver 



Add SPI driver for InvenSense ICM-426xxx devices.

Configure bus signal slew rates as indicated in the datasheet.

Signed-off-by: default avatarJean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 7297ef1e

drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c

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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");