tty/serial: add generic serial earlycon

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This introduces generic earlycon infrastructure for serial devices
based on the 8250 earlycon. This allows for supporting earlycon option
with other serial devices. The earlycon output is enabled at the time
early_params are processed.

Only architectures that have fixmap support or have functional ioremap
when early_params are processed are supported. This is the same
restriction that the 8250 driver had.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Rob Herring 2014-04-18 17:19:55 -05:00 • committed by Greg Kroah-Hartman

parent d20642f0a3

commit 9aac588759

4 changed files with 177 additions and 0 deletions

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7

drivers/tty/serial/Kconfig

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2

drivers/tty/serial/Makefile

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152

drivers/tty/serial/earlycon.c

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16

include/linux/serial_core.h

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