Did Intel just open-source the IPU4 drivers? (github.com)

Short answer: yes — Intel has publicly published a complete IPU4 driver tree in its linux-intel-lts repository, making the kernel-side driver sources for the IPU4 imaging pipeline available for developers to inspect and build. The commit tree (drivers/media/pci/intel/ipu4) contains core subsystems — ipu4-psys (processing system), ipu4-isys (image system), CSS components, CSI-2 interfaces, DMA/MMU handling, firmware resource bindings and platform register headers — and appears in the 5.15/android_u branch, indicating a push targeted at Android/LTS consumers as well as general Linux use. Why it matters: IPU4 is Intel’s on-chip imaging/vision accelerator used for camera pipelines and local vision/AI preprocessing. Publishing the driver sources lowers integration friction for device makers, kernel maintainers and ML/vision engineers who need low‑level access or want to upstream patches. Technically this is more than a stub — it’s a full driver stack including PSYS/ISYS control, CSI‑2 backends and firmware communication plumbing — but note the caveat that firmware blobs themselves may still be proprietary or distributed separately. This move should accelerate edge vision/ML deployment on Intel platforms and encourage community contributions, even if full mainline inclusion and firmware licensing details still need confirmation.