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Tip revision: 36a21d51725af2ce0700c6ebcb6b9594aac658a6 authored by Linus Torvalds on 08 August 2021, 20:49:31 UTC
Linux 5.14-rc5
Linux 5.14-rc5
Tip revision: 36a21d5
dynamic-resolution-notes.rst
.. SPDX-License-Identifier: GPL-2.0
=================================
Devicetree Dynamic Resolver Notes
=================================
This document describes the implementation of the in-kernel
DeviceTree resolver, residing in drivers/of/resolver.c
How the resolver works
----------------------
The resolver is given as an input an arbitrary tree compiled with the
proper dtc option and having a /plugin/ tag. This generates the
appropriate __fixups__ & __local_fixups__ nodes.
In sequence the resolver works by the following steps:
1. Get the maximum device tree phandle value from the live tree + 1.
2. Adjust all the local phandles of the tree to resolve by that amount.
3. Using the __local__fixups__ node information adjust all local references
by the same amount.
4. For each property in the __fixups__ node locate the node it references
in the live tree. This is the label used to tag the node.
5. Retrieve the phandle of the target of the fixup.
6. For each fixup in the property locate the node:property:offset location
and replace it with the phandle value.