[PATCH v3 2/2] serial: lantiq: Make driver modular

[Rahul Tanwar]

Add changes so Lantiq serial driver can be compiled as a module.

Signed-off-by: Rahul Tanwar <rahul.tan...@linux.intel.com>
---
 drivers/tty/serial/Kconfig  |  4 +++-
 drivers/tty/serial/lantiq.c | 29 +++++++++++++++++++++++++----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index bb4009a1135f..c0681da66653 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1034,11 +1034,13 @@ config SERIAL_SIFIVE_CONSOLE
          boot time.)
 
 config SERIAL_LANTIQ
-       bool "Lantiq serial driver"
+       tristate "Lantiq serial driver"
        depends on (LANTIQ || X86) || COMPILE_TEST
        select SERIAL_CORE
        help
          Support for UART on Lantiq and Intel SoCs.
+         To compile this driver as a module, select M here. The
+         module will be called lantiq.
 
 config SERIAL_LANTIQ_CONSOLE
        bool "Console on Lantiq UART"
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index d3b62a1be6ad..62813e421f12 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/lantiq.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
@@ -823,8 +824,7 @@ static void free_irq_intel(struct uart_port *port)
        free_irq(ltq_port->common_irq, port);
 }
 
-static int __init
-lqasc_probe(struct platform_device *pdev)
+static int lqasc_probe(struct platform_device *pdev)
 {
        struct device_node *node = pdev->dev.of_node;
        struct ltq_uart_port *ltq_port;
@@ -908,6 +908,13 @@ lqasc_probe(struct platform_device *pdev)
        return ret;
 }
 
+static int lqasc_remove(struct platform_device *pdev)
+{
+       struct uart_port *port = platform_get_drvdata(pdev);
+
+       return uart_remove_one_port(&lqasc_reg, port);
+}
+
 static const struct ltq_soc_data soc_data_lantiq = {
        .fetch_irq = fetch_irq_lantiq,
        .request_irq = request_irq_lantiq,
@@ -925,8 +932,11 @@ static const struct of_device_id ltq_asc_match[] = {
        { .compatible = "intel,lgm-asc", .data = &soc_data_intel },
        {},
 };
+MODULE_DEVICE_TABLE(of, ltq_asc_match);
 
 static struct platform_driver lqasc_driver = {
+       .probe          = lqasc_probe,
+       .remove         = lqasc_remove,
        .driver         = {
                .name   = DRVNAME,
                .of_match_table = ltq_asc_match,
@@ -942,10 +952,21 @@ init_lqasc(void)
        if (ret != 0)
                return ret;
 
-       ret = platform_driver_probe(&lqasc_driver, lqasc_probe);
+       ret = platform_driver_register(&lqasc_driver);
        if (ret != 0)
                uart_unregister_driver(&lqasc_reg);
 
        return ret;
 }
-device_initcall(init_lqasc);
+
+static void __exit exit_lqasc(void)
+{
+       platform_driver_unregister(&lqasc_driver);
+       uart_unregister_driver(&lqasc_reg);
+}
+
+module_init(init_lqasc);
+module_exit(exit_lqasc);
+
+MODULE_DESCRIPTION("Serial driver for Lantiq & Intel gateway SoCs");
+MODULE_LICENSE("GPL v2");
-- 
2.11.0