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- .. 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.
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