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 (include/linux/reboot.h)

[1] https://lore.kernel.org/rust-for-linux/20260629-rust_leds...
[2] https://lore.kernel.org/rust-for-linux/20260603-rust_serd...

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
Changes in v15:
- adapted to rust led abstractiopn v21
- Link to v14: https://patch.msgid.link/20260531-synology_microp_initial...

Changes in v14:
- adapt to led abstraction v18 and serdev abstraction v11
- Link to v13: https://patch.msgid.link/20260530-synology_microp_initial...

Changes in v13:
- adapted to driver-lifetime v5 patch series.
- set blink = false as initial power led state, as set_blink hasn't been
  called yet (even though the led is blinking at startup)
- Link to v12: https://patch.msgid.link/20260429-synology_microp_initial...

Changes in v12:
- adapted to driver-lifetime patch series. The driver can't take
  advantage of it, until class devices like led also make use of it.
- Link to v11: https://patch.msgid.link/20260427-synology_microp_initial...

Changes in v11:
- rebased on top of 7.1-rc1
- add "synology" as devicename to led, like it is done in existing dts
  files in the kernel
- fix color for led being orange instead of amber. I personally can't
  clearly tell them apart, but apparently its amber.
- replaced MCU with EC in Kconfig help
- Link to v10: https://patch.msgid.link/20260424-synology_microp_initial...

Changes in v10:
- resolved issues reported by Sashiko Bot:
  - removed unneeded include from device tree
  - fix typo in of device table
  - fix blink not set to false, if delay_off or delay_on is 0
- Link to v9: https://patch.msgid.link/20260423-synology_microp_initial...

Changes in v9:
- separate fallback and front compatibles in dt schema
- remove front compatibles from of id table, if all functionality is
  by covered by the fallback
- remove TODO file
- add platform-driver-x86@vger.kernel.org to Maintainers file entry
- use `Delta` type in `BLINK_DELAY` const
- Link to v8: https://patch.msgid.link/20260420-synology_microp_initial...

Changes in v8:
- removed unnecessary Copy and Clone derive
- added `BLINK_DELAY` constant
- added compatible id fallbacks
- moved dt schema patch before the driver
- added ds411p
- Link to v7: https://lore.kernel.org/r/20260411-synology_microp_initia...

Changes in v7:
- remove list of compatible ids from commit msg
- explain what makes the different models not compatible in the commit msg
- remove unnecessary examples
- Link to v6: https://lore.kernel.org/r/20260405-synology_microp_initia...

Changes in v6:
- moved devicetree bindings patch at the end of the set
- remove several patches
- move of id table from model.rs to synology_microp.rs
- remove the model! macro
- use if blocks in devicetree schema to narrow down the
  fan-failure-gpios property
- add multiple devicetree examples to test if blocks
- Link to v5: https://lore.kernel.org/r/20260329-synology_microp_initia...

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 (2):
      dt-bindings: embedded-controller: Add synology microp devices
      platform: Add initial synology microp driver

 .../synology,ds918p-microp.yaml                    | 100 +++++++
 MAINTAINERS                                        |   7 +
 drivers/platform/Kconfig                           |   2 +
 drivers/platform/Makefile                          |   1 +
 drivers/platform/synology_microp/Kconfig           |  13 +
 drivers/platform/synology_microp/Makefile          |   3 +
 drivers/platform/synology_microp/command.rs        |  54 ++++
 drivers/platform/synology_microp/led.rs            | 297 +++++++++++++++++++++
 drivers/platform/synology_microp/model.rs          |  49 ++++
 .../platform/synology_microp/synology_microp.rs    |  91 +++++++
 10 files changed, 617 insertions(+)
---
base-commit: 728e68a889bcf257b1e67298b12c360e5c3a13e0
change-id: 20260306-synology_microp_initial-0f7dac7b7496
prerequisite-message-id: 20260530132736.3298549-1-dakr@kernel.org
prerequisite-patch-id: 310c6bee038ca3909a8e5e58ec12b74f7189b869
prerequisite-patch-id: 92812c3d42b29504838e6dc66c307ff5c035bb5e
prerequisite-change-id: 20251217-rust_serdev-ee5481e9085c:v12
prerequisite-patch-id: 059e43aa20628647ba98a0e5582444a5a7b68ec4
prerequisite-patch-id: 310c6bee038ca3909a8e5e58ec12b74f7189b869
prerequisite-patch-id: 92812c3d42b29504838e6dc66c307ff5c035bb5e
prerequisite-patch-id: a75cb3f900db0e765351b773cbfffaeb9a01a107
prerequisite-patch-id: 19eb53ce0c653c1406f8f192f6ad158fb4bd8d8f
prerequisite-patch-id: 55d6a70baf3be7f4da36b82cf02a5a7d59457520
prerequisite-change-id: 20251114-rust_leds-a959f7c2f7f9:v21
prerequisite-patch-id: d6a2bb314f215e3c6bd3a3ac87b991a33e3d6256
prerequisite-patch-id: 50bfe4b15f07d3733d4fc4b4520ce74cbac2cf4f
prerequisite-patch-id: ec48c2616ea8f0bd8f71cec858f1d5d0fdb2bac0