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27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
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Utilities for extracting information from device-tree sources
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Device trees are prominently used in the Linux world for describing the
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structure of SoCs as for the parametrisation of device drivers. The utilities
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found in this directory ease the extraction of interesting information from
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device-tree files.
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The utilities found in this directory operate on device-tree source (dts)
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files as opposed to device-tree binaries (dtb) because dts files contain
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information about the inter-dependencies between nodes in textual form
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(labels) instead of mere numbers (phandles).
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In the Linux source tree, dts files can be found at _arch/<arch>/boot/dts/_.
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Most dts files leverage the C preprocessor to include fragments in the form of
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dtsi files. To generate the complete device-tree source information for a
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given dts file, the C preprocessor must be invoked as follows:
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! cpp -Iinclude -x assembler-with-cpp -P <dts-file>
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The _parse_ tool generates a syntax tree from a dts file. It is not meant to
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be invoked directly but it is used as a helper by other tools.
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The _extract_ tool can be used to query structural information from a dts
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file and to prune a device tree specifically for a subset of devices. For
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usage information, execute the tool without arguments.
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