Add version to specification text

Currently the HTML version of the specification doesn't have any
indication of the version. Add the version to the title in the doc.

Signed-off-by: Rob Herring <robh@kernel.org>

Author: robherring

source/conf.py

@@ -90,6 +90,12 @@ def setup(app):
 with open('rst_prolog', 'rb') as pr:
     rst_prolog = pr.read().decode('utf-8')
 
+rst_epilog = """
+.. |SpecVersion| replace:: {versionnum}
+""".format(
+versionnum = version,
+)
+
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 

source/index.rst

@@ -5,8 +5,8 @@
 
    SPDX-License-Identifier: Apache-2.0
 
-Welcome to Devicetree Specification's documentation!
-====================================================
+|spec-fullname| |SpecVersion|
+======================================
 
 .. toctree::
    :numbered:
@@ -30,4 +30,3 @@ Welcome to Devicetree Specification's documentation!
    * :ref:`genindex`
    * :ref:`modindex`
    * :ref:`search`
-