[PATCH v3 0/2] serial: lantiq: Make driver modular & console configurable

[PATCH v3 0/2] serial: lantiq: Make driver modular & console configurable

[Rahul Tanwar]

Patch 1 is to make lantiq UART driver's use as console selectable/configurable.
Patch 2 adds changes so the driver can be compiled as module.

v3:
- Fix a section mismatch warning. Reported-by: kbuild test robot <lkp@intel.com>.

v2:
- Split into two patches. One for console configuration and two for
  modular driver. (Greg KH) 

v1:
- Initial version.


Rahul Tanwar (2):
  serial: lantiq: Make UART's use as console selectable
  serial: lantiq: Make driver modular

 drivers/tty/serial/Kconfig  | 13 +++++++++++--
 drivers/tty/serial/lantiq.c | 40 +++++++++++++++++++++++++++++++++++-----
 2 files changed, 46 insertions(+), 7 deletions(-)

-- 
2.11.0

[PATCH v3 1/2] serial: lantiq: Make UART's use as console selectable

[Rahul Tanwar]

Lantiq UART driver can be used for system console. Add changes to
make this driver's use as console selectable/configurable.

Signed-off-by: Rahul Tanwar <rahul.tanwar@linux.intel.com>
---
 drivers/tty/serial/Kconfig  |  9 ++++++++-
 drivers/tty/serial/lantiq.c | 11 ++++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 4b0a7b98f8c7..bb4009a1135f 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1037,10 +1037,17 @@ config SERIAL_LANTIQ
 	bool "Lantiq serial driver"
 	depends on (LANTIQ || X86) || COMPILE_TEST
 	select SERIAL_CORE
+	help
+	  Support for UART on Lantiq and Intel SoCs.
+
+config SERIAL_LANTIQ_CONSOLE
+	bool "Console on Lantiq UART"
+	depends on SERIAL_LANTIQ=y
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help
-	  Support for console and UART on Lantiq SoCs.
+	  Select this option if you would like to use a Lantiq UART as the
+	  system console.
 
 config SERIAL_QE
 	tristate "Freescale QUICC Engine serial port support"
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index c5e46ff972e4..d3b62a1be6ad 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -597,6 +597,7 @@ static const struct uart_ops lqasc_pops = {
 	.verify_port =	lqasc_verify_port,
 };
 
+#ifdef CONFIG_SERIAL_LANTIQ_CONSOLE
 static void
 lqasc_console_putchar(struct uart_port *port, int ch)
 {
@@ -705,6 +706,14 @@ lqasc_serial_early_console_setup(struct earlycon_device *device,
 OF_EARLYCON_DECLARE(lantiq, "lantiq,asc", lqasc_serial_early_console_setup);
 OF_EARLYCON_DECLARE(lantiq, "intel,lgm-asc", lqasc_serial_early_console_setup);
 
+#define LANTIQ_SERIAL_CONSOLE	(&lqasc_console)
+
+#else
+
+#define LANTIQ_SERIAL_CONSOLE	NULL
+
+#endif /* CONFIG_SERIAL_LANTIQ_CONSOLE */
+
 static struct uart_driver lqasc_reg = {
 	.owner =	THIS_MODULE,
 	.driver_name =	DRVNAME,
@@ -712,7 +721,7 @@ static struct uart_driver lqasc_reg = {
 	.major =	0,
 	.minor =	0,
 	.nr =		MAXPORTS,
-	.cons =		&lqasc_console,
+	.cons =		LANTIQ_SERIAL_CONSOLE,
 };
 
 static int fetch_irq_lantiq(struct device *dev, struct ltq_uart_port *ltq_port)
-- 
2.11.0

[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.tanwar@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