[PATCH V11 4/9] iio: imu: inv_icm42607: Add I2C and SPI For icm42607

[Jonathan Cameron]

On Wed, 10 Jun 2026 12:54:48 -0500
Chris Morgan <macroalpha82 at gmail.com> wrote:

> From: Chris Morgan <macromorgan at hotmail.com>
> 
> Add I2C and SPI driver support for InvenSense ICM-42607 devices.
> Add necessary Kconfig and Makefile to allow building of (incomplete)
> driver.
> 
> Signed-off-by: Chris Morgan <macromorgan at hotmail.com>

Some similar missing FIELD_PREP() comments. Not a bug, but
a readability issue that is easy to resolve.

> diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
> index 334264120b42..26dc09bbeaed 100644
> --- a/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
> +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_core.c
>
> diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_i2c.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_i2c.c
> new file mode 100644
> index 000000000000..2946d5465853
> --- /dev/null
> +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_i2c.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2026 InvenSense, Inc.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "inv_icm42607.h"
> +
> +static int inv_icm42607_i2c_bus_setup(struct inv_icm42607_state *st)
> +{
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_clear_bits(st->map, INV_ICM42607_REG_INTF_CONFIG1,
> +				INV_ICM42607_INTF_CONFIG1_I3C_DDR_EN |
> +				INV_ICM42607_INTF_CONFIG1_I3C_SDR_EN);
> +	if (ret)
> +		return ret;
> +
> +	val = FIELD_PREP(INV_ICM42607_DRIVE_CONFIG2_I2C_MASK,
> +			 INV_ICM42607_SLEW_RATE_12_36NS);
> +	ret = regmap_update_bits(st->map, INV_ICM42607_REG_DRIVE_CONFIG2,
> +				 INV_ICM42607_DRIVE_CONFIG2_I2C_MASK, val);
> +	if (ret)
> +		return ret;
> +
> +	return regmap_update_bits(st->map, INV_ICM42607_REG_INTF_CONFIG0,
> +				  INV_ICM42607_INTF_CONFIG0_UI_SIFS_CFG_MASK,
> +				  INV_ICM42607_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS);
FIELD_PREP() (see below)
> +}

> diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_spi.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_spi.c
> new file mode 100644
> index 000000000000..3485777ac5b6
> --- /dev/null
> +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_spi.c
> @@ -0,0 +1,104 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2026 InvenSense, Inc.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +
> +#include "inv_icm42607.h"
> +
> +static int inv_icm42607_spi_bus_setup(struct inv_icm42607_state *st)
> +{
> +	unsigned int val;
> +	int ret;
> +
> +	/* Only support 4-wire mode for now. */
> +	ret = regmap_set_bits(st->map, INV_ICM42607_REG_DEVICE_CONFIG,
> +				      INV_ICM42607_DEVICE_CONFIG_SPI_AP_4WIRE);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_clear_bits(st->map, INV_ICM42607_REG_INTF_CONFIG1,
> +				INV_ICM42607_INTF_CONFIG1_I3C_DDR_EN |
> +				INV_ICM42607_INTF_CONFIG1_I3C_SDR_EN);
> +	if (ret)
> +		return ret;
> +
> +	val = FIELD_PREP(INV_ICM42607_DRIVE_CONFIG3_SPI_MASK,
> +			 INV_ICM42607_SLEW_RATE_2NS);
> +	ret = regmap_update_bits(st->map, INV_ICM42607_REG_DRIVE_CONFIG3,
> +				 INV_ICM42607_DRIVE_CONFIG3_SPI_MASK, val);
> +	if (ret)
> +		return ret;
> +
> +	return regmap_update_bits(st->map, INV_ICM42607_REG_INTF_CONFIG0,
> +				  INV_ICM42607_INTF_CONFIG0_UI_SIFS_CFG_MASK,
> +				  INV_ICM42607_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS);
Should be a FIELD_PREP() for readability (so reviewer doesn't need to check
this field includes bit 0)

> +}
>