[PATCH] Add 'serial-number' as a root node property

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'serial-number' is a root node property originating from OpenFirmware and
has been documented for a long time in Linux kernel's boot-without-of.txt.

Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
 source/devicenodes.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/devicenodes.rst b/source/devicenodes.rst
index 8825ad9add2d..519aa3776884 100644
--- a/source/devicenodes.rst
+++ b/source/devicenodes.rst
@@ -48,6 +48,8 @@ are descendants. The full path to the root node is ``/``.
                                                For example:
 
                                                ``compatible = "fsl,mpc8572ds"``
+   ``serial-number``   O     ``<string>``      Specifies a string representing the device's
+                                               serial number.
    Usage legend: R=Required, O=Optional, OR=Optional but Recommended, SD=See Definition
    ===========================================================================================
 
-- 
2.20.1




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