[PATCH v4 0/5] Auxiliary bus Rust abstractions

[Danilo Krummrich <dakr@kernel.org>]

This series adds Rust abstractions for the auxiliary bus.

It implements the required abstractions to write auxiliary drivers and create
auxiliary device registrations. A driver sample illustrates how the
corresponding abstractions work.

The auxiliary abstractions are required for the Nova driver project, in order to
connect nova-core with the nova-drm driver.

A branch containing the patches can be found in [1].

[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/auxiliary

Changes in v4:
  - drop TryFrom<&Device> for &auxiliary::Device for now; we likely don't need
    it anytime soon
  - sample: rename PciDriver to ParentDriver; add connect() to ParentDriver
  - rebase onto https://lore.kernel.org/rust-for-linux/20250413173758.12068-1-dakr@kernel.org/

Changes in v3:
  - export auxiliary_bus_type
  - implement impl TryFrom<&Device> for &auxiliary::Device
  - implement Send + Sync for Registration and Device

Changes in v2:
  - implement bus device soundness improvements from [2]

Danilo Krummrich (5):
  rust: types: add `Opaque::zeroed`
  rust: device: implement Device::parent()
  rust: auxiliary: add auxiliary device / driver abstractions
  rust: auxiliary: add auxiliary registration
  samples: rust: add Rust auxiliary driver sample

 MAINTAINERS                           |   3 +
 rust/bindings/bindings_helper.h       |   1 +
 rust/helpers/auxiliary.c              |  23 ++
 rust/helpers/helpers.c                |   1 +
 rust/kernel/auxiliary.rs              | 360 ++++++++++++++++++++++++++
 rust/kernel/device.rs                 |  18 ++
 rust/kernel/lib.rs                    |   2 +
 rust/kernel/types.rs                  |   8 +
 samples/rust/Kconfig                  |  12 +
 samples/rust/Makefile                 |   1 +
 samples/rust/rust_driver_auxiliary.rs | 122 +++++++++
 11 files changed, 551 insertions(+)
 create mode 100644 rust/helpers/auxiliary.c
 create mode 100644 rust/kernel/auxiliary.rs
 create mode 100644 samples/rust/rust_driver_auxiliary.rs

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2.49.0