[PATCH 03/12] iio: imu: inv_icm42600: add SPI driver for inv_icm42600 driver

[Jean-Baptiste Maneyrol]

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@xxxxxxxxxxxxxx>
---
 .../iio/imu/inv_icm42600/inv_icm42600_spi.c   | 117 ++++++++++++++++++
 1 file changed, 117 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..835ced68a3a3
--- /dev/null
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_spi.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 InvenSense, Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+#include <linux/of_device.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 */
+	mask = INV_ICM42600_INTF_CONFIG6_MASK;
+	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,
+				 mask, val);
+	if (ret)
+		return ret;
+
+	mask = INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY;
+	val = 0;
+	ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4,
+				 mask, val);
+	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 */
+	mask = INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK;
+	val = INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_I2C_DIS;
+	return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
+				  mask, val);
+}
+
+static int inv_icm42600_probe(struct spi_device *spi)
+{
+	const void *match;
+	const struct spi_device_id *spi_id;
+	enum inv_icm42600_chip chip;
+	struct regmap *regmap;
+
+	match = device_get_match_data(&spi->dev);
+	spi_id = spi_get_device_id(spi);
+	if (match)
+		chip = (enum inv_icm42600_chip)match;
+	else if (spi_id)
+		chip = (enum inv_icm42600_chip)spi_id->driver_data;
+	else
+		return -EINVAL;
+
+	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 const struct spi_device_id inv_icm42600_ids[] = {
+	{"icm42600", INV_CHIP_ICM42600},
+	{"icm42602", INV_CHIP_ICM42602},
+	{"icm42605", INV_CHIP_ICM42605},
+	{"icm42622", INV_CHIP_ICM42622},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, inv_icm42600_ids);
+
+static struct spi_driver inv_icm42600_driver = {
+	.probe = inv_icm42600_probe,
+	.id_table = inv_icm42600_ids,
+	.driver = {
+		.of_match_table = inv_icm42600_of_matches,
+		.name = "inv-icm42600-spi",
+		.pm = &inv_icm42600_pm_ops,
+	},
+};
+module_spi_driver(inv_icm42600_driver);
+
+MODULE_AUTHOR("InvenSense, Inc.");
+MODULE_DESCRIPTION("InvenSense ICM-426xx SPI driver");
+MODULE_LICENSE("GPL");
-- 
2.17.1