linux-kernel - [PATCH 3/8] iio: imu: inv_icm45600: add SPI driver for inv

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Message-Id: <20250411-add_newport_driver-v1-3-15082160b019@tdk.com>
Date: Fri, 11 Apr 2025 13:28:35 +0000
From: Remi Buisson via B4 Relay <devnull+remi.buisson.tdk.com@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>, 
 David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 devicetree@...r.kernel.org, Remi Buisson <remi.buisson@....com>
Subject: [PATCH 3/8] iio: imu: inv_icm45600: add SPI driver for
 inv_icm45600 driver

From: Remi Buisson <remi.buisson@....com>

Add SPI driver for InvenSense ICM-456xxx devices.

Signed-off-by: Remi Buisson <remi.buisson@....com>
---
 drivers/iio/imu/inv_icm45600/inv_icm45600_spi.c | 110 ++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/drivers/iio/imu/inv_icm45600/inv_icm45600_spi.c b/drivers/iio/imu/inv_icm45600/inv_icm45600_spi.c
new file mode 100644
index 0000000000000000000000000000000000000000..fba0953343aaf9a6009a740d3a6e6446b5bea53f
--- /dev/null
+++ b/drivers/iio/imu/inv_icm45600/inv_icm45600_spi.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2025 InvenSense, Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.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,
+				INV_ICM45600_SPI_SLEW_RATE_5NS);
+}
+
+static int inv_icm45600_probe(struct spi_device *spi)
+{
+	const void *match;
+	enum inv_icm45600_chip chip;
+	struct regmap *regmap;
+
+	match = device_get_match_data(&spi->dev);
+	if (!match)
+		return -EINVAL;
+	chip = (uintptr_t)match;
+
+	/* 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, true,
+				       inv_icm45600_spi_bus_setup);
+}
+
+/*
+ * device id table is used to identify what device can be
+ * supported by this driver
+ */
+static const struct spi_device_id inv_icm45600_id[] = {
+	{ "icm45605", INV_CHIP_ICM45605 },
+	{ "icm45686", INV_CHIP_ICM45686 },
+	{ "icm45688p", INV_CHIP_ICM45688P },
+	{ "icm45608", INV_CHIP_ICM45608 },
+	{ "icm45634", INV_CHIP_ICM45634 },
+	{ "icm45689", INV_CHIP_ICM45689 },
+	{ "icm45606", INV_CHIP_ICM45606 },
+	{ "icm45687", INV_CHIP_ICM45687 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, inv_icm45600_id);
+
+static const struct of_device_id inv_icm45600_of_matches[] = {
+	{
+		.compatible = "invensense,icm45605",
+		.data = (void *)INV_CHIP_ICM45605,
+	}, {
+		.compatible = "invensense,icm45686",
+		.data = (void *)INV_CHIP_ICM45686,
+	}, {
+		.compatible = "invensense,icm45688p",
+		.data = (void *)INV_CHIP_ICM45688P,
+	}, {
+		.compatible = "invensense,icm45608",
+		.data = (void *)INV_CHIP_ICM45608,
+	}, {
+		.compatible = "invensense,icm45634",
+		.data = (void *)INV_CHIP_ICM45634,
+	}, {
+		.compatible = "invensense,icm45689",
+		.data = (void *)INV_CHIP_ICM45689,
+	}, {
+		.compatible = "invensense,icm45606",
+		.data = (void *)INV_CHIP_ICM45606,
+	}, {
+		.compatible = "invensense,icm45687",
+		.data = (void *)INV_CHIP_ICM45687,
+	},
+	{}
+};
+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");

-- 
2.34.1