On Wed, Nov 11, 2026 at 12:40:05PM +0530, Jayant Shekhar wrote:
On 27-10-2026 01:14, Rob Herring (Arm) wrote:
On Mon, 26 Oct 2026 11:51:11 +0530, Jayant Shekhar wrote:
DCP platforms place the display pipeline under firmware control, so Linux cannot discover display resources through direct register access. The DRM driver therefore needs device-tree descriptions of the Qualcomm transport wrapper, display topology, IOMMU contexts, and panel connections.
Add bindings for the Qualcomm DCP transport wrapper and VirtIO display subsystem. Document the IPCC power-notify resources, transport and framebuffer IOMMU contexts, firmware-visible IOVA range, INTF graph, and DSI panel connections. The wrapper creates a standard VirtIO-MMIO child after the IPCC power-notify sequence has completed.
Assisted-by: LLM Signed-off-by: Jayant Shekhar jayant.shekhar@oss.qualcomm.com
.../bindings/display/msm/qcom,dcp-dsi.yaml | 79 ++++++++++++ .../devicetree/bindings/display/msm/qcom,dcp.yaml | 123 +++++++++++++++++++ .../bindings/virtio/qcom,dcp-virtio.yaml | 132 +++++++++++++++++++++ 3 files changed, 334 insertions(+)
My bot found errors running 'make dt_binding_check' on your patch:
yamllint warnings/errors:
dtschema/dtc warnings/errors: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/virtio/qcom,dcp-virtio.yaml: iommu-ranges: multiple incompatible types: uint32-array /usr/local/lib/python3.13/dist-packages/dtschema/schemas/iommu/iommu.yaml: iommu-ranges: multiple incompatible types: uint32-matrix Could not decode node virtio@9be8000 property iommu-ranges with value b'\x00\x00\x00\x00\x84\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00'
Traceback (most recent call last): File "/usr/local/bin/dt-validate", line 8, in <module> sys.exit(main()) ~~~~^^ File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb_validate.py", line 443, in main dtb_diagnostics = sg.check_dtb(filename) File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb_validate.py", line 331, in check_dtb dt = self.validator.decode_dtb(f.read(), decode_errors) File "/usr/local/lib/python3.13/dist-packages/dtschema/validator.py", line 631, in decode_dtb return [dtschema.dtb.fdt_unflatten(self, dtb)] ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^ File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 591, in fdt_unflatten dt = fdt_scan_node(validator, fdt, '/', offset) File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 320, in fdt_scan_node node = fdt_scan_node(validator, fdt, nodename, offset) File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 320, in fdt_scan_node node = fdt_scan_node(validator, fdt, nodename, offset) File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 312, in fdt_scan_node node_dict = node_props(validator, fdt, nodename, offset) File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 258, in node_props props_dict[p.name] = prop_value(validator, nodename, p) ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.13/dist-packages/dtschema/dtb.py", line 185, in prop_value if len(p) / type_format[fmt].size >= min_dim: ~~~~~~~~~~~^^^^^ KeyError: 'uint32-array'
doc reference errors (make refcheckdocs):
See https://patchwork.kernel.org/project/devicetree/patch/20261026-jshekhar-dcp-...
The base for the series is generally the latest rc1. A different dependency should be noted in *this* patch.
If you already ran 'make dt_binding_check' and didn't see the above error(s), then make sure 'yamllint' is installed and dt-schema is up to date:
pip3 install dtschema --upgrade
Please check and re-submit after running the above command yourself. Note that DT_SCHEMA_FILES can be set to your schema file to speed up checking your schema. However, it must be unset to test all examples with your schema.
There is a dependent patch which adds iommu-ranges, I had tried with that locally and it passes.
Where in the patch does it say that? The maintainer applying this series needs to know about the dependency, hence the report.
b4 provides for ways to define the base and any dependencies. Use that and then you won't get this report.
Rob