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37 lines
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Platform Compatibility Policy
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=============================
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Introduction
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------------
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This document clarifies the project's policy around compatibility for upstream
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platforms.
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Platform compatibility policy
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-----------------------------
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Platform compatibility is mainly affected by changes to Platform APIs (as
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documented in the `Porting Guide`_), driver APIs (like the GICv3 drivers) or
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library interfaces (like xlat_table library). The project will try to maintain
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compatibility for upstream platforms. Due to evolving requirements and
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enhancements, there might be changes affecting platform compatibility which
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means the previous interface needs to be deprecated and a new interface
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introduced to replace it. In case the migration to the new interface is trivial,
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the contributor of the change is expected to make good effort to migrate the
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upstream platforms to the new interface.
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The `Release information`_ documents the deprecated interfaces and the intended
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release after which it will be removed. When an interface is deprecated, the
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page must be updated to indicate the release after which the interface will be
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removed. This must be at least 1 full release cycle in future. For non-trivial
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interface changes, a `tf-issue`_ should be posted to notify platforms that they
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should migrate away from the deprecated interfaces. Platforms are expected to
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migrate before the removal of the deprecated interface.
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--------------
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*Copyright (c) 2018, Arm Limited and Contributors. All rights reserved.*
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.. _Porting Guide: ../getting_started/porting-guide.rst
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.. _Release information: https://github.com/ARM-software/arm-trusted-firmware/wiki/TF-A-Release-information#removal-of-deprecated-interfaces
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.. _tf-issue: https://github.com/ARM-software/tf-issues/issues
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