[PATCH v10 0/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

Thu Oct 29 16:13:37 PDT 2026

Add the board compatible and device tree for the ASRock Rack B650D4U
AST2600 BMC. The DTS describes memory, SPI NOR, UART5, GFX memory,
GPIO names, the I2C7 EEPROM/NVMEM MAC provider, MAC0/MDIO, and both
ADC engines with an ordered IIO-to-hwmon bridge.

This revision corrects regressions in v9's compatible ordering and
binding acknowledgement, restores the revision history, and addresses
the UART alias and DTS-style feedback. No new hardware is added.

Changes in v10:
- Restore the binding Acked-by from Krzysztof's earlier review [R1].
- Place asrock,b650d4u-bmc after the aspeed entries, as in v7/v8.
- Drop the serial0 override and use the inherited serial4/UART5 alias
  for stdout. Bootloader console arguments and getty must use ttyS4.
- Consolidate the root node and order peripheral references and ADC
  properties according to the strict DTS-style check.
- Restore the earlier history and discussion links below.

Changes in v9 [9]:
- Enable ADC0 and ADC1 with 2.5-V internal references and pin groups.
- Add the sixteen-channel IIO-to-hwmon bridge.
- Rebase onto the Aspeed ARM DT maintainer branch and normalize GPIO
  comma spacing. This revision inadvertently lost the binding Acked-by
  and regressed compatible ordering; both are corrected in v10.

Changes in v8 [8]:
- Correct the validation report to multi_v7_defconfig with ARCH_ASPEED
  and MACH_ASPEED_G6 enabled; retain the DTS and scoped review trailer.

Changes in v7 [7]:
- Correct GPIOP reset/power/NMI button/control names and remove the
  obsolete F5 reset name; leave the binding unchanged.
- Subsequent review requested the validation correction and carrying
  Andrew's review tag forward [R4].

v6:
- Prepared locally only; no public submission. The sent version number
  moved from v5 to v7.

Changes in v5 [5]:
- Add I2C7 EEPROM/NVMEM for MAC0 and select rgmii-id.
- Use the standard OpenBMC 64-MiB flash layout.
- Add initial GPIO names and the reusable 16-MiB graphics pool.
- Drop the previous RX-delay-only justification.
- Follow-up review requested GPIO mapping/style and threading fixes
  [R2, R3]. Andrew's Reviewed-by applies only to MAC0/MDIO.

Changes in v4 [4]:
- Correct memory size to 512 MiB and add explicit flash partitions.
- Report RGMII traffic tests and select rgmii-rxid; that delay rationale
  was challenged and superseded by the rgmii-id selection in v5.
- Order peripheral nodes alphabetically by label.

Earlier public submissions:
- v3 [3]: board-compatible/DTS series. Krzysztof supplied the binding
  Acked-by and requested preservation of review tags [R1].
- v2 [2]: early board DTS, including UART5 via serial4. Its complete
  per-version changelog was not recovered; the archived patch is linked
  rather than inferring an unsupported change list.
- Initial submission [1]: board binding/DTS, with QEMU console and
  board-identification testing reported in the cover.

Review tags:
The binding carries Krzysztof's original Acked-by address. Andrew's
Reviewed-by remains explicitly restricted to MAC0 and MDIO nodes;
no complete-board review is claimed.

Validation:
- Compiled and schema-checked the v10 board DTB with multi_v7_defconfig,
  CONFIG_ARCH_ASPEED=y and CONFIG_MACH_ASPEED_G6=y, using
  arm-linux-gnueabi-gcc and dtschema 2026.9.
- dt_binding_check for arm/aspeed/aspeed.yaml completed without
  diagnostics in the reported output.
- CHECK_DTBS=y reported no board-specific errors. Two unmatched-schema
  diagnostics remain for inherited aspeed,ast2600-lhc and
  aspeed,ast2600-i3c-global nodes.
- Strict dt-check-style and whitespace checks passed. Checkpatch reports
  no errors and one MAINTAINERS reminder for the new board file, covered
  by the existing Aspeed directory entry.

These are DTB/binding checks, not a complete kernel build or boot test.

Both ADC engines, twelve configured voltage rails and recovery after BMC
restart were tested in a custom Linux 6.18.24 OpenBMC image with the same
ADC settings. That image has separate power-control changes, a different
flash layout and ttyS0 console configuration. The complete upstream DTS,
including v10's ttyS4 console selection, has not been boot-tested.
Voltage scaling is userspace configuration outside this series.

Base: 8db593481c8669eddb8b4e21ea44f3fa11d9f030, aspeed/arm/dt
https://git.kernel.org/pub/scm/linux/kernel/git/bmc/linux.git

Previous submissions and review discussions:
[1] https://lore.kernel.org/all/20260512175019.47548-1-prasanth.padarthi10@gmail.com/
[2] https://lists.infradead.org/pipermail/linux-arm-kernel/2026-May/1129461.html
[3] https://lore.kernel.org/all/20260518033440.17569-1-prasanth.padarthi10@gmail.com/
[4] https://lore.kernel.org/all/20260830182036.284736-1-prasanth.padarthi10@gmail.com/
[5] https://lore.kernel.org/all/20260915013110.4780-1-prasanth.padarthi10@gmail.com/
[7] https://lore.kernel.org/all/cover.1790079398.git.prasanth.padarthi10@gmail.com/
[8] https://lore.kernel.org/all/20261002062933.26497-1-prasanth.padarthi10@gmail.com/
[9] https://lore.kernel.org/all/20261027034911.99482-1-prasanth.padarthi10@gmail.com/
[R1] https://lore.kernel.org/all/20260518-rustling-watchful-viper-b9c4b4@quoll/
[R2] https://lkml.iu.edu/2609.2/00630.html
[R3] https://lkml.iu.edu/2609.2/00642.html
[R4] https://lists.openwall.net/linux-kernel/2026/09/22/1982

Prasanth Kumar Padarthi (2):
  dt-bindings: arm: aspeed: Add ASRock Rack B650D4U
  ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

 .../bindings/arm/aspeed/aspeed.yaml           |   1 +
 arch/arm/boot/dts/aspeed/Makefile             |   1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 169 ++++++++++++++++++
 3 files changed, 171 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts

base-commit: 8db593481c8669eddb8b4e21ea44f3fa11d9f030
-- 
2.47.3