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serial: 8250/mediatek: fix building with SERIAL_8250=m 

The Mediatek 8250 driver has a 'bool' Kconfig symbol, but that
breaks when SERIAL_8250 is a loadable module:

drivers/tty/built-in.o: In function `mtk8250_set_termios':
:(.text+0x1bee8): undefined reference to `serial8250_do_set_termios'
:(.text+0x1bf10): undefined reference to `uart_get_baud_rate'
:(.text+0x1c09c): undefined reference to `uart_get_divisor'
drivers/tty/built-in.o: In function `mtk8250_do_pm':
:(.text+0x1c0d0): undefined reference to `serial8250_do_pm'
drivers/tty/built-in.o: In function `mtk8250_probe':
:(.text+0x1c2e4): undefined reference to `serial8250_register_8250_port'
serial/8250/8250_mtk.c:287:242: error: data definition has no type or storage class [-Werror]
serial/8250/8250_mtk.c:287:122: error: 'mtk8250_platform_driver_init' defined but not used [-Werror=unused-function]

This changes the symbol to a 'tristate', so the dependency on
SERIAL_8250 also works when that is set to 'm'.
To actually build the driver, we also need to include <linux/module.h>.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2016-02-17 16:02:35 +01:00 committed by Greg Kroah-Hartman
parent 7d774fb8ca
commit 3f5921a60f
2 changed files with 2 additions and 2 deletions
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2
drivers/tty/serial/8250/8250_mtk.c
View File

@ -303,7 +303,7 @@ static struct platform_driver mtk8250_platform_driver = {
}; };
module_platform_driver(mtk8250_platform_driver); module_platform_driver(mtk8250_platform_driver);
#ifdef CONFIG_SERIAL_8250_CONSOLE #if defined(CONFIG_SERIAL_8250_CONSOLE) && !defined(MODULE)
static int __init early_mtk8250_setup(struct earlycon_device *device, static int __init early_mtk8250_setup(struct earlycon_device *device,
const char *options) const char *options)
{ {

2
drivers/tty/serial/8250/Kconfig
View File

@ -371,7 +371,7 @@ config SERIAL_8250_LPC18XX
serial port, say Y to this option. If unsure, say Y. serial port, say Y to this option. If unsure, say Y.
config SERIAL_8250_MT6577 config SERIAL_8250_MT6577
bool "Mediatek serial port support" tristate "Mediatek serial port support"
depends on SERIAL_8250 && ARCH_MEDIATEK depends on SERIAL_8250 && ARCH_MEDIATEK
help help
If you have a Mediatek based board and want to use the If you have a Mediatek based board and want to use the