Linux Device Tree binding work turns hardware descriptions into rules that can be checked automatically. Modern bindings are YAML files written with JSON Schema vocabulary; make dt_binding_check validates the schemas, and make dtbs_check checks Device Tree data against them. The Linux Foundation’s GSoC project-ideas page includes a “Device tree bindings conversions” project group, but the available evidence does not establish a particular 2025 participant, accepted proposal, or completed result.
What are Linux Device Tree bindings?
A Device Tree describes hardware to software such as an operating system or bootloader. A binding defines what information a particular hardware node is expected to contain, giving the description a consistent structure that can be checked.
Modern Linux bindings are YAML documents using JSON Schema vocabulary. YAML makes the files readable and editable; the schema vocabulary expresses machine-checkable constraints. A binding commonly includes a title, maintainers, property definitions, required-property lists, examples, and rules about whether properties not explicitly listed are allowed. The Linux kernel’s schema-writing documentation describes the format and its elements.
Why convert a legacy binding to YAML?
A prose or otherwise unstructured description may explain intended hardware data to a person, but it does not provide the same consistent checks as a schema. A schema can state which properties are expected, which are required, and what constraints apply. That makes omissions and invalid data easier to detect during development.
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Conversion is not merely a file-format change. The author needs to express the hardware node’s requirements precisely, include useful examples, and follow kernel binding conventions. The kernel documentation supports the role of schemas and validation, but no specific legacy binding or conversion patch is established here, so the improvement in any individual conversion cannot be quantified.
How to write or convert a binding
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Identify the hardware node and the properties its description must contain. Distinguish required properties from optional ones and determine whether additional properties should be allowed.
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Write the binding as a YAML schema using JSON Schema vocabulary. Include the schema’s descriptive information, property definitions, required-property list, examples, and applicable constraints.
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Check that the schema captures the intended hardware description rather than simply translating old prose. Examples should demonstrate valid node data, and the constraints should be specific enough to support validation.
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Run the binding and Device Tree checks described below, then address reported schema or data errors before preparing the patch.
How to validate a Device Tree binding
Linux uses two complementary checks. dt_binding_check checks binding schema documents against the binding meta-schema. dtbs_check checks Device Tree source data against the schemas. Passing one does not replace the other: a well-formed schema and Device Tree data that conforms to it are separate things to verify.
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Install the required validation tooling from the dtschema project. Kernel documentation describes installation through Python packaging and notes that supporting system dependencies are required.
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From the kernel source tree, run
make dt_binding_checkto validate binding schemas.Quick wins for a faster PC:
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Run
make dtbs_checkto check Device Tree data against the schemas. -
To limit a check to selected schema files, use the
DT_SCHEMA_FILESmechanism documented by the kernel. Consult the kernel’s validation guidance for the supported invocation and details.
Validation depends on the dtschema tooling as well as the kernel build environment. If a check fails, use its diagnostics to identify whether the issue is in the schema, the Device Tree data, or the local validation setup; do not treat a successful binding check alone as proof that all Device Tree data conforms.
How binding patches fit into kernel contribution conventions
Kernel guidance treats binding files as documentation. It recommends separating the Documentation and include/dt-bindings/ portions into a separate patch, following the relevant subsystem guidance for patch order and organization. The common subject prefix is dt-bindings: <binding directory>: ..., although some subsystems reverse the order. Binding changes are expected to pass validation. See the kernel’s binding patch-submission guidance.
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What is established about the 2025 GSoC connection?
The Linux Foundation GSoC project-ideas page lists “Device tree bindings conversions” as a project group and describes its idea groups as suggested projects. That establishes a connection to the Foundation’s GSoC project portfolio, not proof of a specific 2025 accepted proposal or project outcome. The listed page is for Google Summer of Code 2026.
A secondary mentor-project list names a related 2024 project, “Device tree bindings: Convert device tree bindings to DT schema.” That provides context for earlier work, but does not establish what happened in 2025. No authoritative 2025 participant record, exact scope, mentor assignment, or final report is established by these sources.
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