[PATCH v10 0/5] rust: add basic serial device bus abstractions

[Markus Probst]

This patch series adds the serdev device bus rust abstraction into the
kernel.

This abstraction will be used by a driver,
which targets the MCU devices in Synology devices.

Kari Argillander also messaged me, stating that he wants to write a
watchdog driver with this abstraction (needing initial device data).

This series depends on [1] and [2].

[1]
https://lore.kernel.org/rust-for-linux/20260525202921.124698-1-dakr@xxxxxxxxxx/
[2] https://lore.kernel.org/rust-for-linux/20260530132736.3298549-1-dakr@xxxxxxxxxx/

Signed-off-by: Markus Probst <markus.probst@xxxxxxxxx>
---
Changes in v10:
- revert everything from v9, except BoundInternal
- use mutex to ensure receive_buf won't be called on a dropped drvdata.
- Link to v9: https://patch.msgid.link/20260530-rust_serdev-v9-0-f8b5fccb49c3@xxxxxxxxx

Changes in v9:
- make use of BoundInternal
- use PrivateData wrapper and drop rust_private_data field
- use non-devm version of serdev_device_open
- Link to v8: https://patch.msgid.link/20260530-rust_serdev-v8-0-2a95f1da22a7@xxxxxxxxx

Changes in v8:
- adapted to driver-lifetime v5 patch series
- add MAINTAINERS file patch
- Link to v7: https://patch.msgid.link/20260429-rust_serdev-v7-0-0d89c791b5c8@xxxxxxxxx

Changes in v7:
- adapted to driver-lifetime patch series
- Link to v6: https://patch.msgid.link/20260427-rust_serdev-v6-0-173798d5e1a3@xxxxxxxxx

Changes in v6:
- rebased onto v7.1-rc1
- Link to v5: https://patch.msgid.link/20260420-rust_serdev-v5-0-57e8ba0519f3@xxxxxxxxx

Changes in v5:
- fix typo in documentation
- Link to v4: https://lore.kernel.org/r/20260411-rust_serdev-v4-0-845e960c6627@xxxxxxxxx

Changes in v4:
- fixed not selecting rust serdev abstraction in sample
- Link to v3: https://lore.kernel.org/r/20260313-rust_serdev-v3-0-c9a3af214f7f@xxxxxxxxx

Changes in v3:
- fix vertical import style
- add Kconfig entry for the rust abstraction
- fix documentation in include/linux/serdev.h
- rename private_data to rust_private_data
- fix `complete_all` <-> `wait_for_completion` typo
- move drvdata_borrow call after the completion
- Link to v2: https://lore.kernel.org/r/20260306-rust_serdev-v2-0-e9b23b42b255@xxxxxxxxx

Changes in v2:
- fix documentation in `serdev::Driver::write` and
  `serdev::Driver::write_all`
- remove use of `dev_info` in probe from the sample
- remove `properties_parse` from the sample
- add optional `baudrate` property to the sample
- remove 1. patch
- remove `TryFrom<&device::Device<Ctx>> for &serdev::Device<Ctx>`
  implementation
- fix import style
- add patch to return reference in `devres::register` to fix safety
  issue
- add patch to add private data to serdev_device, to fix
  `Device.drvdata()` from failing
- simplify abstraction by removing ability to receive the initial
  transmission. It may be added later in a separate patch series if
  needed.
- Link to v1: https://lore.kernel.org/r/20251220-rust_serdev-v1-0-e44645767621@xxxxxxxxx

---
Markus Probst (5):
      rust: devres: return reference in `devres::register`
      serdev: add rust private data to serdev_device
      rust: add basic serial device bus abstractions
      samples: rust: add Rust serial device bus sample device driver
      MAINTAINERS: serdev: Add self for serdev

 MAINTAINERS                        |   5 +-
 drivers/tty/serdev/Kconfig         |   7 +
 include/linux/serdev.h             |  15 +-
 rust/bindings/bindings_helper.h    |   1 +
 rust/helpers/helpers.c             |   1 +
 rust/helpers/serdev.c              |  22 ++
 rust/kernel/cpufreq.rs             |   3 +-
 rust/kernel/devres.rs              |  15 +-
 rust/kernel/drm/driver.rs          |   3 +-
 rust/kernel/lib.rs                 |   2 +
 rust/kernel/serdev.rs              | 553 +++++++++++++++++++++++++++++++++++++
 samples/rust/Kconfig               |  11 +
 samples/rust/Makefile              |   1 +
 samples/rust/rust_driver_serdev.rs |  91 ++++++
 14 files changed, 719 insertions(+), 11 deletions(-)
---
base-commit: 9e171fc1d7d7ab847a750c03571c87ac3c17bd84
change-id: 20251217-rust_serdev-ee5481e9085c
prerequisite-message-id: 20260505152400.3905096-1-dakr@xxxxxxxxxx
prerequisite-patch-id: d2aebf69b153c039bbed1d0ed26906708fd22534
prerequisite-patch-id: 84b28da2f5de20fc1785095c647b2ffc35d969a5
prerequisite-patch-id: 67318671a5eed5fb4ad23a450f1cf0e442bf8ca2
prerequisite-message-id: 20260525202921.124698-1-dakr@xxxxxxxxxx
prerequisite-patch-id: b84db329d4372a175cb8d49e4e88c3eecf7eb228
prerequisite-patch-id: 2c30303f409cc8288cc87e241920219f5ddd8390
prerequisite-patch-id: 4e4f0ad370d763ad00b0f75b91fa216f2cc95953
prerequisite-patch-id: 5bcd6b37f3498feebda275dfef78136eba34004e
prerequisite-patch-id: 872b0982f3e5e7d1698d9df3b325e4cd27b27789
prerequisite-patch-id: 3a3c7749e017d9335f58497404d1350e96caf471
prerequisite-patch-id: 3526c9154f581497a11465b936d83ef61a875454
prerequisite-patch-id: 65d8c757b52475c2acc7d22ddc92cd3f0152b55d
prerequisite-patch-id: 4bd31f1414d5248dc080884caadf5f21684a8427
prerequisite-patch-id: 7beadbb0da3e589ed86d12f512d1c83427dd82b4
prerequisite-patch-id: 12cd0f67ffd27347f90c065db491945908206b7f
prerequisite-patch-id: 4642e31f66331f6c3b579377111ea733dbb3a11c
prerequisite-patch-id: 52d67b40b4396c741e2222d6a5bc7927abcb77aa
prerequisite-patch-id: 74ca82ff26cf9c7a993757c87db8be62006e820f
prerequisite-patch-id: 466fb9fa7febbffd8ef51b311c7d9893c11fc0f0
prerequisite-patch-id: e515cd98b06e26721cbbe6a4fbacd251d0073b63
prerequisite-patch-id: 8dc8e75d9f6499a554ef7e474bbacdbf3660a9f2
prerequisite-patch-id: 5fdb9f71dca2f44dd293760a60db125b770f1f55
prerequisite-patch-id: c766a24c2d5064f5ec09daada0b8e8fba862d3aa
prerequisite-patch-id: b768f6456d35fa7a80c015e34bbdba6082dbd593
prerequisite-patch-id: 6a8b17234f12f7084e6e2ce843a7031b0a891ce4
prerequisite-patch-id: 98b2deb9e60c1f28f90c5ee34fd608aaa9fd9420
prerequisite-patch-id: 774b29be66e641ee50cedb4704cf49d8b9fabf50
prerequisite-patch-id: cf95dc936cfc4b3a7a363435a51a48d9009645b3
prerequisite-message-id: 20260530132736.3298549-1-dakr@xxxxxxxxxx
prerequisite-patch-id: 310c6bee038ca3909a8e5e58ec12b74f7189b869
prerequisite-patch-id: 92812c3d42b29504838e6dc66c307ff5c035bb5e