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 <[email protected]> --- 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/[email protected] 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/[email protected] --- 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
