You can find the Samsung Exynos 7885 Kernel on GitHub to compile compressed kernel images.
The Exynos 7885 drivers are but represent a walled garden. For developers, they’re a reverse-engineering target, not a friendly platform. If you need mainline Linux or open-source GPU drivers, choose a Snapdragon 660/845 device instead. If you already own an Exynos 7885 device, stick to Samsung’s stock-based custom ROMs (like OneUI 4.1 ports) – do not chase “open-source drivers” for this chip; they don’t exist yet. exynos 7885 driver