From: Timur Tabi <timur@freescale.com>
Date: Sat, 9 Jul 2011 00:06:12 +0000 (-0500)
Subject: tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver
X-Git-Tag: v3.2-rc1~170^2~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dcd83aaff1c8cbd5b48c152b559e0af3ea1a7b65;p=pandora-kernel.git

tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver

The ePAPR embedded hypervisor specification provides an API for "byte
channels", which are serial-like virtual devices for sending and receiving
streams of bytes.  This driver provides Linux kernel support for byte
channels via three distinct interfaces:

1) An early-console (udbg) driver.  This provides early console output
through a byte channel.  The byte channel handle must be specified in a
Kconfig option.

2) A normal console driver.  Output is sent to the byte channel designated
for stdout in the device tree.  The console driver is for handling kernel
printk calls.

3) A tty driver, which is used to handle user-space input and output.  The
byte channel used for the console is designated as the default tty.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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