of/fdt: add FDT serial scanning for earlycon
authorRob Herring <robh@kernel.org>
Thu, 27 Mar 2014 13:07:01 +0000 (08:07 -0500)
committerRob Herring <robh@kernel.org>
Tue, 20 May 2014 20:19:26 +0000 (15:19 -0500)
commitfb11ffe74c794a510a29ad8cd81d4e9e3b1c9158
tree67a58a06a67ea7e0ac7374d604312d2207457498
parente06e8b27082852bdab417af884241a4ed2037c73
of/fdt: add FDT serial scanning for earlycon

This adds FDT parsing of {linux,}stdout-path to setup an early serial
console. Enabling of the early console is triggered with "earlycon"
(with no options) on the kernel command line.

Platforms must either have fixmap permanent mapping support,
have a functioning ioremap when early params are parsed, or explicitly
call early_init_dt_scan_chosen_serial from architecture code.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
drivers/of/fdt.c