iio: imu: inv_icm45600: add SPI driver for inv_icm45600 driver

Add SPI driver for InvenSense ICM-456000 devices.

Signed-off-by: Remi Buisson <remi.buisson@tdk.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/inv_icm45600/Kconfig

@@ -26,3 +26,24 @@ config INV_ICM45600_I2C
 
 	  This driver can be built as a module. The module will be called
 	  inv-icm45600-i2c.
+
+config INV_ICM45600_SPI
+	tristate "InvenSense ICM-456xx SPI driver"
+	depends on SPI_MASTER
+	select INV_ICM45600
+	select REGMAP_SPI
+	help
+	  This driver supports the InvenSense ICM-456xx motion tracking
+	  devices over SPI.
+	  Supported devices:
+	  - ICM-45605
+	  - ICM-45606
+	  - ICM-45608
+	  - ICM-45634
+	  - ICM-45686
+	  - ICM-45687
+	  - ICM-45688-P
+	  - ICM-45689
+
+	  This driver can be built as a module. The module will be called
+	  inv-icm45600-spi.

drivers/iio/imu/inv_icm45600/Makefile

@@ -8,3 +8,6 @@ inv-icm45600-y += inv_icm45600_accel.o
 
 obj-$(CONFIG_INV_ICM45600_I2C) += inv-icm45600-i2c.o
 inv-icm45600-i2c-y += inv_icm45600_i2c.o
+
+obj-$(CONFIG_INV_ICM45600_SPI) += inv-icm45600-spi.o
+inv-icm45600-spi-y += inv_icm45600_spi.o

drivers/iio/imu/inv_icm45600/inv_icm45600_spi.c

@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (C) 2025 InvenSense, Inc. */
+
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+
+#include <linux/spi/spi.h>
+
+#include "inv_icm45600.h"
+
+static const struct regmap_config inv_icm45600_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int inv_icm45600_spi_bus_setup(struct inv_icm45600_state *st)
+{
+	/* Set slew rates for SPI. */
+	return regmap_update_bits(st->map, INV_ICM45600_REG_DRIVE_CONFIG0,
+				INV_ICM45600_DRIVE_CONFIG0_SPI_MASK,
+				FIELD_PREP(INV_ICM45600_DRIVE_CONFIG0_SPI_MASK,
+					INV_ICM45600_SPI_SLEW_RATE_5NS));
+}
+
+static int inv_icm45600_probe(struct spi_device *spi)
+{
+	const struct inv_icm45600_chip_info *chip_info;
+	struct regmap *regmap;
+
+	chip_info = spi_get_device_match_data(spi);
+	if (!chip_info)
+		return -ENODEV;
+
+	/* Use SPI specific regmap. */
+	regmap = devm_regmap_init_spi(spi, &inv_icm45600_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	return inv_icm45600_core_probe(regmap, chip_info, true,
+				       inv_icm45600_spi_bus_setup);
+}
+
+/*
+ * The device id table is used to identify which device is
+ * supported by this driver.
+ */
+static const struct spi_device_id inv_icm45600_id[] = {
+	{ "icm45605", (kernel_ulong_t)&inv_icm45605_chip_info },
+	{ "icm45606", (kernel_ulong_t)&inv_icm45606_chip_info },
+	{ "icm45608", (kernel_ulong_t)&inv_icm45608_chip_info },
+	{ "icm45634", (kernel_ulong_t)&inv_icm45634_chip_info },
+	{ "icm45686", (kernel_ulong_t)&inv_icm45686_chip_info },
+	{ "icm45687", (kernel_ulong_t)&inv_icm45687_chip_info },
+	{ "icm45688p", (kernel_ulong_t)&inv_icm45688p_chip_info },
+	{ "icm45689", (kernel_ulong_t)&inv_icm45689_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, inv_icm45600_id);
+
+static const struct of_device_id inv_icm45600_of_matches[] = {
+	{
+		.compatible = "invensense,icm45605",
+		.data = &inv_icm45605_chip_info,
+	}, {
+		.compatible = "invensense,icm45606",
+		.data = &inv_icm45606_chip_info,
+	}, {
+		.compatible = "invensense,icm45608",
+		.data = &inv_icm45608_chip_info,
+	}, {
+		.compatible = "invensense,icm45634",
+		.data = &inv_icm45634_chip_info,
+	}, {
+		.compatible = "invensense,icm45686",
+		.data = &inv_icm45686_chip_info,
+	}, {
+		.compatible = "invensense,icm45687",
+		.data = &inv_icm45687_chip_info,
+	}, {
+		.compatible = "invensense,icm45688p",
+		.data = &inv_icm45688p_chip_info,
+	}, {
+		.compatible = "invensense,icm45689",
+		.data = &inv_icm45689_chip_info,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, inv_icm45600_of_matches);
+
+static struct spi_driver inv_icm45600_driver = {
+	.driver = {
+		.name = "inv-icm45600-spi",
+		.of_match_table = inv_icm45600_of_matches,
+		.pm = pm_ptr(&inv_icm45600_pm_ops),
+	},
+	.id_table = inv_icm45600_id,
+	.probe = inv_icm45600_probe,
+};
+module_spi_driver(inv_icm45600_driver);
+
+MODULE_AUTHOR("InvenSense, Inc.");
+MODULE_DESCRIPTION("InvenSense ICM-456xx SPI driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_ICM45600");