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+Coding Style & Guidelines
+=========================
+
+The following sections contain |TS| coding guidelines. They are continually evolving and should not be considered "set
+in stone". Feel free to question them and provide feedback.
+
+The |TS| project uses multiple "domains" (textual content types, like programming languages) and each defines its own
+rules.
+
+To help configuring text editors the project comes with "`EditorConfig`_" file(s). (:download:`../../.editorconfig`).
+
+Shared rules
+------------
+
+The following rules are common for all domains, except where noted otherwise:
+
+#. Files shall be **UTF-8** encoded.
+#. Use **Unix** style line endings (``LF`` character)
+#. The primary language of the project is English. All comments and documentation must be in this language.
+#. Trailing whitespace is not welcome, please trim these.
+
+C Domain
+--------
+
+C source code rules are base on the *Linux Coding Style* (See: |LCS|). The following deviations apply:
+
+5. |TS| follows *ISO/IEC 9899:1999* standard with |ACLE| version *Q3 2020* extensions.
+#. Line length shall not exceed 100 characters.
+#. Use `snake_case`_ for function, variable and file names.
+#. Each file shall be "self contained" and include header files with external dependencies. No file shall depend on
+   headers included by other files.
+#. Include ordering: please include project specific headers first and then system includes. Please order the files
+   alphabetically in the above two groups.
+#. All variables must be initialized.
+
+Boring stuff is not for smart people and the project uses the `Uncrustify`_ code beautifier to easy formatting the
+source. (See :download:`../../.uncrustify.cfg`)
+
+CMake domain
+------------
+
+11. CMake file names use `CamelCase`_ style.
+#. Indent with tabs and otherwise use spaces. Use 4 spaces for tab size.
+#. Use LF as line end in CMake files.
+#. Remove trailing whitespace.
+#. Maximum line length is 128 characters.
+#. When complicated functionality is needed prefer CMake scripting over other languages.
+#. Prefix local variables with `_`.
+#. Use functions to prevent global name-space pollution.
+#. Use `snake_case`_ for function and variable names.
+#. Use the ``include_guard()`` CMake function when creating new modules, to prevent multiple inclusion.
+#. Use self contained modules, i.e. include direct dependencies of the module.
+#. Use the Sphinx CMake domain for in-line documentation of CMake scripts. For details please refer to the
+   `CMake Documentation`_.
+
+.. todo:: Explain CMake return values and parent scope concept in more detail.
+
+Restructured Text Domain
+------------------------
+
+Please refer to :doc:`/developer/writing-documentation`.
+
+--------------
+
+.. _`CamelCase`: https://hu.wikipedia.org/wiki/CamelCase
+.. _`snake_case`: https://en.wikipedia.org/wiki/Snake_case
+.. _`CMake Documentation`: https://github.com/Kitware/CMake/blob/master/Help/dev/documentation.rst
+.. _`EditorConfig`: https://editorconfig.org/
+.. _`Uncrustify`: https://github.com/uncrustify/uncrustify
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause