[PATCH 5/8] tty: serial: samsung: Enable console as module

[Sam Protsenko <semen.protsenko@linaro.org>]

Enable serial driver to be built as a module. To do so, init the console
support on driver/module load instead of using console_initcall().

This is needed for proper support of USIv2 driver (which can be built as
a module, which in turn makes SERIAL_SAMSUNG be a module too). It also
might be useful for Android GKI modularization efforts.

Inspired by commit 87a0b9f98ac5 ("tty: serial: meson: enable console as
module").

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 drivers/tty/serial/Kconfig       |  2 +-
 drivers/tty/serial/samsung_tty.c | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index fc543ac97c13..0e5ccb25bdb1 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -263,7 +263,7 @@ config SERIAL_SAMSUNG_UARTS
 
 config SERIAL_SAMSUNG_CONSOLE
 	bool "Support for console on Samsung SoC serial port"
-	depends on SERIAL_SAMSUNG=y
+	depends on SERIAL_SAMSUNG
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index f986a9253dc8..92a63e9392ed 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -1720,10 +1720,10 @@ static int __init s3c24xx_serial_console_init(void)
 	register_console(&s3c24xx_serial_console);
 	return 0;
 }
-console_initcall(s3c24xx_serial_console_init);
 
 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
 #else
+static inline int s3c24xx_serial_console_init(void) { return 0; }
 #define S3C24XX_SERIAL_CONSOLE NULL
 #endif
 
@@ -2898,7 +2898,24 @@ static struct platform_driver samsung_serial_driver = {
 	},
 };
 
-module_platform_driver(samsung_serial_driver);
+static int __init samsung_serial_init(void)
+{
+	int ret;
+
+	ret = s3c24xx_serial_console_init();
+	if (ret)
+		return ret;
+
+	return platform_driver_register(&samsung_serial_driver);
+}
+
+static void __exit samsung_serial_exit(void)
+{
+	platform_driver_unregister(&samsung_serial_driver);
+}
+
+module_init(samsung_serial_init);
+module_exit(samsung_serial_exit);
 
 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
 /*
-- 
2.30.2