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+##############################
+Yet another coding standard :)
+##############################
+
+.. Warning::
+
+    Every rule has an exception so if you disagree or dislike then reach out!
+
+The coding style of TF-M project is based on
+`Linux coding style <https://www.kernel.org/doc/html/v4.10/process/coding-style.html>`__
+but there are updates for domain specific conventions as listed below.
+
+TF-M also reuses code from other SW projects, e.g. ``CMSIS_5``, which
+means some areas of code may have different styles. We use common sense approach
+and new code may inherit coding style from external projects but it needs to
+remain within clear scope.
+
+The guidance below is provided as a help. It isn't meant to be a definitive
+list.
+
+As implied in the :doc:`contributing guide </contributing>` maintainers
+have the right to decide on what's acceptable in case of any divergence.
+
+.. Warning::
+
+    Text files do not fall within these rules as they may require different formatting.``
+
+****************
+Consistent style
+****************
+The code needs to be consistent with itself, so if existing code in the file
+violates listed coding style rules then it is better to follow existing style
+in the file and not break consistency by following the rules listed here.
+
+You may need to add a comment in the commit description to clarify this.
+
+List of rules
+=============
+
+- Use 4 spaces indentation. No tabs.
+- Use ``lower_case_with_underscore`` for filenames, variable and function names.
+- Use standard types e.g. ``uint32_t``, ``uint16_t``, ``uint8_t``, ``int32_t``
+  etc.
+- Use ``uintptr_t`` type when representing addresses as numbers.
+- Use static for all private functions and variables.
+- Use void argument if your function doesn't contain any argument.
+- Use C90 ``/* */`` for comments rather than C99 ``//``
+- No trailing spaces in code.
+- Max 80 characters length. Text files are exception as stated above.
+- Open curly brace ``{`` at the same if/else/while/for/switch statement line.
+- Use curly braces ``{ }`` for one line statement bodies also.
+- Put open curly brace in the line below the function header.
+- Order function parameters so that input params are before output params.
+- Declare local variables at the beginning of the function.
+- Define macros in all caps i.e. ``CAPITAL_WITH_UNDERSCORE``.
+- Use typedefs **ONLY** for function prototype declarations.
+- Type definitions in ``lower_case_with_underscore`` ended by ``_t``.
+- Do not use typedef for other constructs as it obfuscates code.
+- Do not use bitfields.
+- Use static for all global variables to reduce the variable scope.
+- Use enumeration for error codes to keep the code readable.
+- Use descriptive variable and functions names.
+- Put the correct license header at the beginning of the file.
+- Keep the files (.h/.c) self-contained, i.e. put include dependencies in the
+  file.
+- Put appropriate header define guard in .h files: ``__HEADER_NAME__``.
+  Any divergence from this rules should be clearly documented.
+- In a .c file, #include it's own header file first.
+- Document all the public functions in the header file only.
+- Document all the private functions in the source file only.
+- Add "extern C " definition for C++ support in the header files.
+- In the switch statement, aligned cases with the switch keyword.
+- For enums, use upper case letters with digits and underscore only.
+- Do not code while eating.
+
+--------------
+
+*Copyright (c) 2018-2019, Arm Limited. All rights reserved.*