Merge branch 'net-phy-rust'

FUJITA Tomonori says:

====================
Rust abstractions for network PHY drivers

No functional change since v10; only comment and commit log updates.

This patchset adds Rust abstractions for phylib. It doesn't fully
cover the C APIs yet but I think that it's already useful. I implement
two PHY drivers (Asix AX88772A PHYs and Realtek Generic FE-GE). Seems
they work well with real hardware.

The first patch introduces Rust bindings for phylib.

The second patch adds a macro to declare a kernel module for PHYs
drivers.

The third adds the Rust ETHERNET PHY LIBRARY entry to MAINTAINERS
file; adds the binding file and me as a maintainer (as Andrew Lunn
suggested) with Trevor Gross as a reviewer.

The last patch introduces the Rust version of Asix PHY driver,
drivers/net/phy/ax88796b.c. The features are equivalent to the C
version. You can choose C (by default) or Rust version on kernel
configuration.

v11:
  - adds Andrew, Alice, and Trevor's Reviewed-by
  - comment update
v10: https://lore.kernel.org/netdev/20231210234924.1453917-1-fujita.tomonori@gmail.com/T/
  - adds Trevor's SoB to the third patch
  - adds Benno's Reviewed-by to the second patch
v9: https://lore.kernel.org/netdev/20231205.124531.842372711631366729.fujita.tomonori@gmail.com/T/
  - adds a workaround to access to a bit field in phy_device
  - fixes a comment typo
v8: https://lore.kernel.org/netdev/20231123050412.1012252-1-fujita.tomonori@gmail.com/
  - updates the safety comments on Device and its related code
  - uses _phy_start_aneg instead of phy_start_aneg
  - drops the patch for enum synchronization
  - moves Sync From Registration to DriverVTable
  - fixes doctest errors
  - minor cleanups
v7: https://lore.kernel.org/netdev/20231026001050.1720612-1-fujita.tomonori@gmail.com/T/
  - renames get_link() to is_link_up()
  - improves the macro format
  - improves the commit log in the third patch
  - improves comments
v6: https://lore.kernel.org/netdev/20231025.090243.1437967503809186729.fujita.tomonori@gmail.com/T/
  - improves comments
  - makes the requirement of phy_drivers_register clear
  - fixes Makefile of the third patch
v5: https://lore.kernel.org/all/20231019.094147.1808345526469629486.fujita.tomonori@gmail.com/T/
  - drops the rustified-enum option, writes match by hand; no *risk* of UB
  - adds Miguel's patch for enum checking
  - moves CONFIG_RUST_PHYLIB_ABSTRACTIONS to drivers/net/phy/Kconfig
  - adds a new entry for this abstractions in MAINTAINERS
  - changes some of Device's methods to take &mut self
  - comment improvment
v4: https://lore.kernel.org/netdev/20231012125349.2702474-1-fujita.tomonori@gmail.com/T/
  - split the core patch
  - making Device::from_raw() private
  - comment improvement with code update
  - commit message improvement
  - avoiding using bindings::phy_driver in public functions
  - using an anonymous constant in module_phy_driver macro
v3: https://lore.kernel.org/netdev/20231011.231607.1747074555988728415.fujita.tomonori@gmail.com/T/
  - changes the base tree to net-next from rust-next
  - makes this feature optional; only enabled with CONFIG_RUST_PHYLIB_BINDINGS=y
  - cosmetic code and comment improvement
  - adds copyright
v2: https://lore.kernel.org/netdev/20231006094911.3305152-2-fujita.tomonori@gmail.com/T/
  - build failure fix
  - function renaming
v1: https://lore.kernel.org/netdev/20231002085302.2274260-3-fujita.tomonori@gmail.com/T/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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