tty: serial: earlycon dependency

parse_options() in drivers/tty/serial/earlycon.c calls uart_parse_earlycon
in drivers/tty/serial/serial_core.c therefore selecting SERIAL_EARLYCON
should automatically select SERIAL_CORE, otherwise will result in symbol
not found error during linking if SERIAL_CORE is not configured as builtin

Fixes: 9aac5887595b ("tty/serial: add generic serial earlycon")
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Link: https://lore.kernel.org/r/20200828123949.2642-1-ztong0001@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 9409be982aa64c1adc1359ec87c31c09c42efe63..54586c1aba60b5a841818ad1a964864c5c9798c5 100644 (file)
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -8,6 +8,7 @@ menu "Serial drivers"
 
 config SERIAL_EARLYCON
        bool
+       depends on SERIAL_CORE
        help
          Support for early consoles with the earlycon parameter. This enables
          the console before standard serial driver is probed. The console is