serial: sc16is7xx: split into core and I2C/SPI parts (core)

Split the common code from sc16is7xx driver and move the I2C and SPI bus
parts into interface-specific source files.

sc16is7xx becomes the core functions which can support multiple bus
interfaces like I2C and SPI.

No functional changes intended.

Also simplify and improve Kconfig entries.
  - Capitalize SPI keyword for consistency
  - Display list of supported ICs each on a separate line (and aligned) to
    facilitate locating a specific IC model
  - Add Manufacturer name at start of description string
  - Add UART keyword to description string

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20240409154253.3043822-4-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/tty/serial/sc16is7xx_i2c.c b/drivers/tty/serial/sc16is7xx_i2c.c
new file mode 100644
index 000000000000..de51d1675abf
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_i2c.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx I2C interface driver */
+
+#include <linux/dev_printk.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/string.h>
+
+#include "sc16is7xx.h"
+
+static int sc16is7xx_i2c_probe(struct i2c_client *i2c)
+{
+	const struct sc16is7xx_devtype *devtype;
+	struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
+	unsigned int i;
+
+	devtype = i2c_get_match_data(i2c);
+	if (!devtype)
+		return dev_err_probe(&i2c->dev, -ENODEV, "Failed to match device\n");
+
+	for (i = 0; i < devtype->nr_uart; i++) {
+		sc16is7xx_regcfg.name = sc16is7xx_regmap_name(i);
+		sc16is7xx_regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i);
+		sc16is7xx_regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
+		regmaps[i] = devm_regmap_init_i2c(i2c, &sc16is7xx_regcfg);
+	}
+
+	return sc16is7xx_probe(&i2c->dev, devtype, regmaps, i2c->irq);
+}
+
+static void sc16is7xx_i2c_remove(struct i2c_client *client)
+{
+	sc16is7xx_remove(&client->dev);
+}
+
+static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
+	{ "sc16is74x",	(kernel_ulong_t)&sc16is74x_devtype, },
+	{ "sc16is740",	(kernel_ulong_t)&sc16is74x_devtype, },
+	{ "sc16is741",	(kernel_ulong_t)&sc16is74x_devtype, },
+	{ "sc16is750",	(kernel_ulong_t)&sc16is750_devtype, },
+	{ "sc16is752",	(kernel_ulong_t)&sc16is752_devtype, },
+	{ "sc16is760",	(kernel_ulong_t)&sc16is760_devtype, },
+	{ "sc16is762",	(kernel_ulong_t)&sc16is762_devtype, },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
+
+static struct i2c_driver sc16is7xx_i2c_driver = {
+	.driver = {
+		.name		= SC16IS7XX_NAME,
+		.of_match_table	= sc16is7xx_dt_ids,
+	},
+	.probe		= sc16is7xx_i2c_probe,
+	.remove		= sc16is7xx_i2c_remove,
+	.id_table	= sc16is7xx_i2c_id_table,
+};
+
+module_i2c_driver(sc16is7xx_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx I2C interface driver");
+MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);