Introduce Synology Microp driver

Synology uses a microcontroller in their NAS devices connected to a
serial port to control certain LEDs, fan speeds, a beeper, to handle
proper shutdown and restart, buttons and fan failures.

This patch series depends on the rust led abstraction [1] and the rust
serdev abstraction [2].

This is only a initial version of the driver able to control LEDs.
The following rust abstractions would be required, to implement the
remaining features:
- hwmon (include/linux/hwmon.h)
- input (include/linux/input.h)
- sysoff handler + hardware protection shutdown (include/linux/reboot.h)

[1] https://lore.kernel.org/rust-for-linux/20260329-rust_leds...
[2] https://lore.kernel.org/rust-for-linux/20260313-rust_serd...

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
Changes in v5:
- add esata led support
- use different compatible for each model
- add visibility modifier to of_device_table macro
- fix match data missing when using PRP0001
- Link to v4: https://lore.kernel.org/r/20260320-synology_microp_initia...

Changes in v4:
- convert to monolithic driver and moved it into drivers/platform
- removed mfd rust abstraction
- moved dt-bindings to embedded-controller
- Link to v3: https://lore.kernel.org/r/20260313-synology_microp_initia...

Changes in v3:
- remove `default n` from Kconfig entry, as n is the default already.
- select RUST_SERIAL_DEV_BUS_ABSTRACTIONS in Kconfig
- add mfd rust abstraction
- split core and led parts into their own driver. It should now be considered a
  MFD device.
- split led part of dt binding into its own file
- Link to v2: https://lore.kernel.org/r/20260308-synology_microp_initia...

Changes in v2:
- fix missing tabs in MAINTAINERS file
- remove word binding from patch subject
- add missing signed-off-by
- add missing help entry in Kconfig
- add missing spdx license headers
- remove no-check{,-cpu}-fan properties from the dt-bindings and replace
  them with the check_fan module parameter
- use patternProperties for leds in dt-bindings
- license dt-binding as GPL-2.0-only OR BSD-2-Clause
- move driver from staging tree into mfd tree and mark it as work in
  progress inside Kconfig
- only register alert and usb led if fwnode is present
- Link to v1: https://lore.kernel.org/r/20260306-synology_microp_initia...

---
Markus Probst (4):
      dt-bindings: embedded-controller: Add synology microp devices
      ACPI: of: match PRP0001 in of_match_device
      rust: add visibility to of_device_table macro
      platform: Add initial synology microp driver

 .../synology,ds923p-microp.yaml                    |  65 +++++
 MAINTAINERS                                        |   6 +
 drivers/acpi/bus.c                                 |   7 +-
 drivers/of/device.c                                |   9 +-
 drivers/platform/Kconfig                           |   2 +
 drivers/platform/Makefile                          |   1 +
 drivers/platform/synology_microp/Kconfig           |  13 +
 drivers/platform/synology_microp/Makefile          |   3 +
 drivers/platform/synology_microp/TODO              |   7 +
 drivers/platform/synology_microp/command.rs        |  55 ++++
 drivers/platform/synology_microp/led.rs            | 276 +++++++++++++++++++++
 drivers/platform/synology_microp/model.rs          | 171 +++++++++++++
 .../platform/synology_microp/synology_microp.rs    |  54 ++++
 include/linux/acpi.h                               |  11 +
 rust/kernel/of.rs                                  |   5 +-
 15 files changed, 678 insertions(+), 7 deletions(-)
---
base-commit: d1d81e9d1a4dd846aee9ae77ff9ecc2800d72148
change-id: 20260306-synology_microp_initial-0f7dac7b7496
prerequisite-change-id: 20251217-rust_serdev-ee5481e9085c:v3
prerequisite-patch-id: 52b17274481cc770c257d8f95335293eca32a2c5
prerequisite-patch-id: eec47e5051640d08bcd34a9670b98804449cad52
prerequisite-patch-id: f24b68c71c3f69371e8ac0251efca0a023b31cc4
prerequisite-patch-id: 3dfc1f7e5ecd3e0dd65d676aeb16f55260847b25
prerequisite-change-id: 20251114-rust_leds-a959f7c2f7f9:v13
prerequisite-patch-id: 818700f22dcb9676157c985f82762d7c607b861e
prerequisite-patch-id: b15ffa7d95d9260151bfb116b259c4473f721c82
prerequisite-patch-id: 8c47e0d107530f577a1be0b79f8ee791f95d3cbe