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).
@Rob: Are you willing to maintain these rust abstractions yourself,
as you are the expert on this subsystem, otherwise I would take care of
it with a "SERIAL DEVICE BUS [RUST]" section in the MAINTAINERS file. In
the second case, I assume you are going to pick those patches as-is into
your tree, after they have been reviewed?
Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
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@posteo.de
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@posteo.de
---
Markus Probst (4):
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
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 | 536 +++++++++++++++++++++++++++++++++++++
samples/rust/Kconfig | 11 +
samples/rust/Makefile | 1 +
samples/rust/rust_driver_serdev.rs | 86 ++++++
13 files changed, 693 insertions(+), 10 deletions(-)
---
base-commit: 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681
change-id: 20251217-rust_serdev-ee5481e9085c