Docs/kernel-parameters: Add earlycon devicetree usage

This form of the earlycon parameter was added by commit fb11ffe74c794a5
("of/fdt: add FDT serial scanning for earlycon") without documentation.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 945bc0de7f0750acefae3f89695c9b1b510b18be..7a01cc0b0b312258ec8c826afbc3a5fcb1b4c3ce 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -973,6 +973,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        earlycon=       [KNL] Output early console device and options.
 
+                       When used with no options, the early console is
+                       determined by the stdout-path property in device
+                       tree's chosen node.
+
                cdns,<addr>
                        Start an early, polled-mode console on a cadence serial
                        port at the specified address. The cadence serial port