linux-kernel - [PATCH 1/1] tty/serial: to support 8250 earlycon can be enabled independently

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Date:	Mon, 16 May 2016 19:35:58 +0800
From:	Zhen Lei <thunder.leizhen@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	linux-serial <linux-serial@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Kefeng Wang" <wangkefeng.wang@...wei.com>,
	Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/1] tty/serial: to support 8250 earlycon can be enabled independently

Sometimes, we may only use SSH to login, and build 8250 uart driver as a
ko(insmod if needed). But the earlycon may still be necessary, because
the kernel boot process may take a long time. It's not good to display
nothing but ask people to wait patiently.

In addition, the 8250.ko can not be worked if we have not opened any
other serial drivers, because SERIAL_CORE would not be selected.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/tty/serial/8250/Kconfig  | 9 +++++++--
 drivers/tty/serial/8250/Makefile | 1 -
 drivers/tty/serial/Makefile      | 1 +
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 4d7cb9c..2992f0a 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -3,6 +3,12 @@
 # you somehow have an implicit or explicit dependency on SERIAL_8250.
 #

+config SERIAL_8250_EARLYCON
+	bool "Early console using 8250"
+	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
+
 config SERIAL_8250
 	tristate "8250/16550 and compatible serial support"
 	select SERIAL_CORE
@@ -60,8 +66,7 @@ config SERIAL_8250_PNP
 config SERIAL_8250_CONSOLE
 	bool "Console on 8250/16550 and compatible serial port"
 	depends on SERIAL_8250=y
-	select SERIAL_CORE_CONSOLE
-	select SERIAL_EARLYCON
+	select SERIAL_8250_EARLYCON
 	---help---
 	  If you say Y here, it will be possible to use a serial port as the
 	  system console (the system console is the device which receives all
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index c9a2d6e..1f24c74 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -13,7 +13,6 @@ obj-$(CONFIG_SERIAL_8250_HP300)		+= 8250_hp300.o
 obj-$(CONFIG_SERIAL_8250_CS)		+= serial_cs.o
 obj-$(CONFIG_SERIAL_8250_ACORN)		+= 8250_acorn.o
 obj-$(CONFIG_SERIAL_8250_BCM2835AUX)	+= 8250_bcm2835aux.o
-obj-$(CONFIG_SERIAL_8250_CONSOLE)	+= 8250_early.o
 obj-$(CONFIG_SERIAL_8250_FOURPORT)	+= 8250_fourport.o
 obj-$(CONFIG_SERIAL_8250_ACCENT)	+= 8250_accent.o
 obj-$(CONFIG_SERIAL_8250_BOCA)		+= 8250_boca.o
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 8c261ad..cd84181 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o

 # Now bring in any enabled 8250/16450/16550 type drivers.
 obj-$(CONFIG_SERIAL_8250) += 8250/
+obj-$(CONFIG_SERIAL_8250_EARLYCON) += 8250/8250_early.o

 obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
 obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
--
2.5.0