[PATCH 0/8] rust: io: register: allow paths for relative register bases

The register! macro currently accepts an identifier as the base of a
relative register. This requires base types declared in other modules to
be imported into the module containing the register declaration, rather
than allowing a qualified path to be used directly, which is arbitrarily
limiting.

This series allows path to be used as relative register bases. Since a
`path` fragment cannot be followed by `+` in declarative macros, the
`Base + Offset` and `Base + Alias` forms are replaced with `Base:
Offset` and `Base: Alias`, inducing a syntax change.

The first two patches clean up the macro's internal dispatch and
arguments in preparation for the change. Patches 3-6 gradually add
support for the new syntax and update docs and examples, while
preserving the old syntax. Patch 7 updates Nova to use the new syntax,
and patch 8 removes support for the now unused old syntax.

The series is structured this way so the Nova update and deprecated
syntax removal can be merged separately, as otherwise the whole series
would need to go through drm-rust.

Outside of the syntax update, no functional change is intended.

Signed-off-by: Alexandre Courbot <[email protected]>
---
Alexandre Courbot (8):
      rust: io: register: dispatch fixed array shortcut internally
      rust: io: register: remove unused rule arguments
      rust: io: register: use path fragment for alias destination
      rust: io: register: use path fragment in relative internal rules
      rust: io: register: allow paths for relative register bases
      rust: io: register: use new relative base syntax in doc and examples
      gpu: nova-core: convert relative registers to new syntax
      rust: io: register: remove deprecated relative register rule

 drivers/gpu/nova-core/regs.rs | 74 +++++++++++++++++++++---------------------
 rust/kernel/io/register.rs    | 75 +++++++++++++++++++++----------------------
 2 files changed, 74 insertions(+), 75 deletions(-)
---
base-commit: 22e77d81d0a9ab3aee1c5538b3f2f8a66930bfa7
change-id: 20260418-registers_fix-7a67ebef9ba0

Best regards,
--  
Alexandre Courbot <[email protected]>