[PATCH v2 2/4] serial: sc16is7xx: split into core and I2C/SPI parts (core)
From: Hugo Villeneuve
Date: Thu Mar 07 2024 - 11:52:25 EST
From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
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 change intended.
Suggested-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
---
drivers/tty/serial/Kconfig | 19 +--
drivers/tty/serial/Makefile | 4 +-
drivers/tty/serial/sc16is7xx.c | 223 +++++------------------------
drivers/tty/serial/sc16is7xx.h | 41 ++++++
drivers/tty/serial/sc16is7xx_i2c.c | 71 +++++++++
drivers/tty/serial/sc16is7xx_spi.c | 94 ++++++++++++
6 files changed, 248 insertions(+), 204 deletions(-)
create mode 100644 drivers/tty/serial/sc16is7xx.h
create mode 100644 drivers/tty/serial/sc16is7xx_i2c.c
create mode 100644 drivers/tty/serial/sc16is7xx_spi.c
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 48087e34ff52..40343fdf7896 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1020,13 +1020,10 @@ config SERIAL_SCCNXP_CONSOLE
help
Support for console on SCCNXP serial ports.
-config SERIAL_SC16IS7XX_CORE
- tristate
-
config SERIAL_SC16IS7XX
tristate "SC16IS7xx serial support"
select SERIAL_CORE
- depends on (SPI_MASTER && !I2C) || I2C
+ depends on SPI_MASTER || I2C
help
Core driver for NXP SC16IS7xx serial ports.
Supported ICs are:
@@ -1042,22 +1039,18 @@ config SERIAL_SC16IS7XX
drivers below.
config SERIAL_SC16IS7XX_I2C
- bool "SC16IS7xx for I2C interface"
+ tristate "SC16IS7xx for I2C interface"
depends on SERIAL_SC16IS7XX
depends on I2C
- select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
- select REGMAP_I2C if I2C
- default y
+ select REGMAP_I2C
help
- Enable SC16IS7xx driver on I2C bus,
- enabled by default to support oldconfig.
+ Enable SC16IS7xx driver on I2C bus.
config SERIAL_SC16IS7XX_SPI
- bool "SC16IS7xx for spi interface"
+ tristate "SC16IS7xx for SPI interface"
depends on SERIAL_SC16IS7XX
depends on SPI_MASTER
- select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
- select REGMAP_SPI if SPI_MASTER
+ select REGMAP_SPI
help
Enable SC16IS7xx driver on SPI bus.
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index b25e9b54a660..9f51b933915a 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -75,7 +75,9 @@ obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o
obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
-obj-$(CONFIG_SERIAL_SC16IS7XX_CORE) += sc16is7xx.o
+obj-$(CONFIG_SERIAL_SC16IS7XX_SPI) += sc16is7xx_spi.o
+obj-$(CONFIG_SERIAL_SC16IS7XX_I2C) += sc16is7xx_i2c.o
+obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o
obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
obj-$(CONFIG_SERIAL_SIFIVE) += sifive.o
obj-$(CONFIG_SERIAL_SPRD) += sprd_serial.o
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 929206a9a6e1..5b53c88b7133 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1,19 +1,19 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
- * Author: Jon Ringle <jringle@xxxxxxxxxxxxx>
+ * SC16IS7xx tty serial driver - common code
*
- * Based on max310x.c, by Alexander Shiyan <shc_work@xxxxxxx>
+ * Copyright (C) 2014 GridPoint
+ * Author: Jon Ringle <jringle@xxxxxxxxxxxxx>
+ * Based on max310x.c, by Alexander Shiyan <shc_work@xxxxxxx>
*/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/export.h>
#include <linux/gpio/driver.h>
-#include <linux/i2c.h>
+#include <linux/kthread.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
@@ -22,14 +22,13 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
-#include <linux/spi/spi.h>
#include <linux/uaccess.h>
#include <linux/units.h>
#include <uapi/linux/sched/types.h>
-#define SC16IS7XX_NAME "sc16is7xx"
+#include "sc16is7xx.h"
+
#define SC16IS7XX_MAX_DEVS 8
-#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */
/* SC16IS7XX register definitions */
#define SC16IS7XX_RHR_REG (0x00) /* RX FIFO */
@@ -302,16 +301,9 @@
/* Misc definitions */
-#define SC16IS7XX_SPI_READ_BIT BIT(7)
#define SC16IS7XX_FIFO_SIZE (64)
#define SC16IS7XX_GPIOS_PER_BANK 4
-struct sc16is7xx_devtype {
- char name[10];
- int nr_gpio;
- int nr_uart;
-};
-
#define SC16IS7XX_RECONF_MD (1 << 0)
#define SC16IS7XX_RECONF_IER (1 << 1)
#define SC16IS7XX_RECONF_RS485 (1 << 2)
@@ -492,35 +484,40 @@ static void sc16is7xx_stop_rx(struct uart_port *port)
sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT);
}
-static const struct sc16is7xx_devtype sc16is74x_devtype = {
+const struct sc16is7xx_devtype sc16is74x_devtype = {
.name = "SC16IS74X",
.nr_gpio = 0,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is74x_devtype);
-static const struct sc16is7xx_devtype sc16is750_devtype = {
+const struct sc16is7xx_devtype sc16is750_devtype = {
.name = "SC16IS750",
.nr_gpio = 8,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is750_devtype);
-static const struct sc16is7xx_devtype sc16is752_devtype = {
+const struct sc16is7xx_devtype sc16is752_devtype = {
.name = "SC16IS752",
.nr_gpio = 8,
.nr_uart = 2,
};
+EXPORT_SYMBOL_GPL(sc16is752_devtype);
-static const struct sc16is7xx_devtype sc16is760_devtype = {
+const struct sc16is7xx_devtype sc16is760_devtype = {
.name = "SC16IS760",
.nr_gpio = 8,
.nr_uart = 1,
};
+EXPORT_SYMBOL_GPL(sc16is760_devtype);
-static const struct sc16is7xx_devtype sc16is762_devtype = {
+const struct sc16is7xx_devtype sc16is762_devtype = {
.name = "SC16IS762",
.nr_gpio = 8,
.nr_uart = 2,
};
+EXPORT_SYMBOL_GPL(sc16is762_devtype);
static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
{
@@ -1463,9 +1460,8 @@ static const struct serial_rs485 sc16is7xx_rs485_supported = {
.delay_rts_after_send = 1, /* Not supported but keep returning -EINVAL */
};
-static int sc16is7xx_probe(struct device *dev,
- const struct sc16is7xx_devtype *devtype,
- struct regmap *regmaps[], int irq)
+int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype,
+ struct regmap *regmaps[], int irq)
{
unsigned long freq = 0, *pfreq = dev_get_platdata(dev);
unsigned int val;
@@ -1657,8 +1653,9 @@ static int sc16is7xx_probe(struct device *dev,
return ret;
}
+EXPORT_SYMBOL_GPL(sc16is7xx_probe);
-static void sc16is7xx_remove(struct device *dev)
+void sc16is7xx_remove(struct device *dev)
{
struct sc16is7xx_port *s = dev_get_drvdata(dev);
int i;
@@ -1680,8 +1677,9 @@ static void sc16is7xx_remove(struct device *dev)
clk_disable_unprepare(s->clk);
}
+EXPORT_SYMBOL_GPL(sc16is7xx_remove);
-static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
+const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
{ .compatible = "nxp,sc16is740", .data = &sc16is74x_devtype, },
{ .compatible = "nxp,sc16is741", .data = &sc16is74x_devtype, },
{ .compatible = "nxp,sc16is750", .data = &sc16is750_devtype, },
@@ -1690,9 +1688,10 @@ static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
{ .compatible = "nxp,sc16is762", .data = &sc16is762_devtype, },
{ }
};
+EXPORT_SYMBOL_GPL(sc16is7xx_dt_ids);
MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids);
-static struct regmap_config regcfg = {
+struct regmap_config sc16is7xx_regcfg = {
.reg_bits = 5,
.pad_bits = 3,
.val_bits = 8,
@@ -1705,8 +1704,9 @@ static struct regmap_config regcfg = {
.max_raw_write = SC16IS7XX_FIFO_SIZE,
.max_register = SC16IS7XX_EFCR_REG,
};
+EXPORT_SYMBOL_GPL(sc16is7xx_regcfg);
-static const char *sc16is7xx_regmap_name(u8 port_id)
+const char *sc16is7xx_regmap_name(u8 port_id)
{
switch (port_id) {
case 0: return "port0";
@@ -1716,184 +1716,27 @@ static const char *sc16is7xx_regmap_name(u8 port_id)
return NULL;
}
}
+EXPORT_SYMBOL_GPL(sc16is7xx_regmap_name);
-static unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id)
+unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id)
{
/* CH1,CH0 are at bits 2:1. */
return port_id << 1;
}
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
-static int sc16is7xx_spi_probe(struct spi_device *spi)
-{
- const struct sc16is7xx_devtype *devtype;
- struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
- unsigned int i;
- int ret;
-
- /* Setup SPI bus */
- spi->bits_per_word = 8;
- /* For all variants, only mode 0 is supported */
- if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
- return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
-
- spi->mode = spi->mode ? : SPI_MODE_0;
- spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
- ret = spi_setup(spi);
- if (ret)
- return ret;
-
- devtype = spi_get_device_match_data(spi);
- if (!devtype)
- return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
-
- for (i = 0; i < devtype->nr_uart; i++) {
- regcfg.name = sc16is7xx_regmap_name(i);
- /*
- * If read_flag_mask is 0, the regmap code sets it to a default
- * of 0x80. Since we specify our own mask, we must add the READ
- * bit ourselves:
- */
- regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
- SC16IS7XX_SPI_READ_BIT;
- regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
- regmaps[i] = devm_regmap_init_spi(spi, ®cfg);
- }
-
- return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
-}
-
-static void sc16is7xx_spi_remove(struct spi_device *spi)
-{
- sc16is7xx_remove(&spi->dev);
-}
-
-static const struct spi_device_id sc16is7xx_spi_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(spi, sc16is7xx_spi_id_table);
-
-static struct spi_driver sc16is7xx_spi_uart_driver = {
- .driver = {
- .name = SC16IS7XX_NAME,
- .of_match_table = sc16is7xx_dt_ids,
- },
- .probe = sc16is7xx_spi_probe,
- .remove = sc16is7xx_spi_remove,
- .id_table = sc16is7xx_spi_id_table,
-};
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
-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++) {
- regcfg.name = sc16is7xx_regmap_name(i);
- regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i);
- regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
- regmaps[i] = devm_regmap_init_i2c(i2c, ®cfg);
- }
-
- 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_uart_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,
-};
-
-#endif
+EXPORT_SYMBOL_GPL(sc16is7xx_regmap_port_mask);
static int __init sc16is7xx_init(void)
{
- int ret;
-
- ret = uart_register_driver(&sc16is7xx_uart);
- if (ret) {
- pr_err("Registering UART driver failed\n");
- return ret;
- }
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver);
- if (ret < 0) {
- pr_err("failed to init sc16is7xx i2c --> %d\n", ret);
- goto err_i2c;
- }
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
- ret = spi_register_driver(&sc16is7xx_spi_uart_driver);
- if (ret < 0) {
- pr_err("failed to init sc16is7xx spi --> %d\n", ret);
- goto err_spi;
- }
-#endif
- return ret;
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
-err_spi:
-#endif
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- i2c_del_driver(&sc16is7xx_i2c_uart_driver);
-err_i2c:
-#endif
- uart_unregister_driver(&sc16is7xx_uart);
- return ret;
+ return uart_register_driver(&sc16is7xx_uart);
}
module_init(sc16is7xx_init);
static void __exit sc16is7xx_exit(void)
{
-#ifdef CONFIG_SERIAL_SC16IS7XX_I2C
- i2c_del_driver(&sc16is7xx_i2c_uart_driver);
-#endif
-
-#ifdef CONFIG_SERIAL_SC16IS7XX_SPI
- spi_unregister_driver(&sc16is7xx_spi_uart_driver);
-#endif
uart_unregister_driver(&sc16is7xx_uart);
}
module_exit(sc16is7xx_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jon Ringle <jringle@xxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("SC16IS7XX serial driver");
+MODULE_DESCRIPTION("SC16IS7xx tty serial core driver");
diff --git a/drivers/tty/serial/sc16is7xx.h b/drivers/tty/serial/sc16is7xx.h
new file mode 100644
index 000000000000..410f34b1005c
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/* SC16IS7xx SPI/I2C tty serial driver */
+
+#ifndef _SC16IS7XX_H_
+#define _SC16IS7XX_H_
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+#include <linux/serial_core.h>
+#include <linux/types.h>
+
+#define SC16IS7XX_NAME "sc16is7xx"
+#define SC16IS7XX_MAX_PORTS 2 /* Maximum number of UART ports per IC. */
+
+struct sc16is7xx_devtype {
+ char name[10];
+ int nr_gpio;
+ int nr_uart;
+};
+
+extern struct regmap_config sc16is7xx_regcfg;
+
+extern const struct of_device_id __maybe_unused sc16is7xx_dt_ids[];
+
+extern const struct sc16is7xx_devtype sc16is74x_devtype;
+extern const struct sc16is7xx_devtype sc16is750_devtype;
+extern const struct sc16is7xx_devtype sc16is752_devtype;
+extern const struct sc16is7xx_devtype sc16is760_devtype;
+extern const struct sc16is7xx_devtype sc16is762_devtype;
+
+const char *sc16is7xx_regmap_name(u8 port_id);
+
+unsigned int sc16is7xx_regmap_port_mask(unsigned int port_id);
+
+int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype,
+ struct regmap *regmaps[], int irq);
+
+void sc16is7xx_remove(struct device *dev);
+
+#endif /* _SC16IS7XX_H_ */
diff --git a/drivers/tty/serial/sc16is7xx_i2c.c b/drivers/tty/serial/sc16is7xx_i2c.c
new file mode 100644
index 000000000000..70f0c329cc13
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_i2c.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx I2C interface driver */
+
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.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,
+};
+
+static int __init sc16is7xx_i2c_init(void)
+{
+ return i2c_add_driver(&sc16is7xx_i2c_driver);
+}
+module_init(sc16is7xx_i2c_init);
+
+static void __exit sc16is7xx_i2c_exit(void)
+{
+ i2c_del_driver(&sc16is7xx_i2c_driver);
+}
+module_exit(sc16is7xx_i2c_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx I2C interface driver");
diff --git a/drivers/tty/serial/sc16is7xx_spi.c b/drivers/tty/serial/sc16is7xx_spi.c
new file mode 100644
index 000000000000..3942fc1b7455
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx_spi.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* SC16IS7xx SPI interface driver */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/units.h>
+
+#include "sc16is7xx.h"
+
+/* SPI definitions */
+#define SC16IS7XX_SPI_READ_BIT BIT(7)
+
+static int sc16is7xx_spi_probe(struct spi_device *spi)
+{
+ const struct sc16is7xx_devtype *devtype;
+ struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
+ unsigned int i;
+ int ret;
+
+ /* Setup SPI bus */
+ spi->bits_per_word = 8;
+ /* For all variants, only mode 0 is supported */
+ if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
+ return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
+
+ spi->mode = spi->mode ? : SPI_MODE_0;
+ spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
+ ret = spi_setup(spi);
+ if (ret)
+ return ret;
+
+ devtype = spi_get_device_match_data(spi);
+ if (!devtype)
+ return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
+
+ for (i = 0; i < devtype->nr_uart; i++) {
+ sc16is7xx_regcfg.name = sc16is7xx_regmap_name(i);
+ /*
+ * If read_flag_mask is 0, the regmap code sets it to a default
+ * of 0x80. Since we specify our own mask, we must add the READ
+ * bit ourselves:
+ */
+ sc16is7xx_regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
+ SC16IS7XX_SPI_READ_BIT;
+ sc16is7xx_regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
+ regmaps[i] = devm_regmap_init_spi(spi, &sc16is7xx_regcfg);
+ }
+
+ return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
+}
+
+static void sc16is7xx_spi_remove(struct spi_device *spi)
+{
+ sc16is7xx_remove(&spi->dev);
+}
+
+static const struct spi_device_id sc16is7xx_spi_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(spi, sc16is7xx_spi_id_table);
+
+static struct spi_driver sc16is7xx_spi_driver = {
+ .driver = {
+ .name = SC16IS7XX_NAME,
+ .of_match_table = sc16is7xx_dt_ids,
+ },
+ .probe = sc16is7xx_spi_probe,
+ .remove = sc16is7xx_spi_remove,
+ .id_table = sc16is7xx_spi_id_table,
+};
+
+static int __init sc16is7xx_spi_init(void)
+{
+ return spi_register_driver(&sc16is7xx_spi_driver);
+}
+module_init(sc16is7xx_spi_init);
+
+static void __exit sc16is7xx_spi_exit(void)
+{
+ spi_unregister_driver(&sc16is7xx_spi_driver);
+}
+module_exit(sc16is7xx_spi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
--
2.39.2