[funkzy]

Summary

#479's T6050 profile registers the input, power and hwmon cells only. That fits the APIF guest. A T6050 kernel that
owns the machine (the M5 Ultra Mac Studio, J775D, with Linux on the hardware) then has no SMC restart or power-off
and no RTC: poweroff halted Linux and left the machine on. This registers macsmc-reboot and macsmc-rtc on
T6050 too, but only where the device tree has their child node, the rule the pcIO outputs and the second GPIO bank
already follow.

What it changes

• The T6050 profile's optional cells (pcIO outputs, the second GPIO bank, reboot, RTC) become one table and one
  helper: a cell is registered when its child node exists.
• A T6050 device tree without reboot or rtc children (the guest's) registers exactly what it did.
• Other SMCs are unchanged: the same cells in the same order. The registration-failure messages now name the cell.

Testing (J775D, M5 Ultra)

The kernel: our J775D series (integration/aurora's lineage, as on the Studio every day) with this PR's code and
that of the other T6050 PRs sent with it in place of the series' own forms, booted once on 2026-11-02 and restarted
through the SMC at the end. The same code is in the series kernel the machine boots by default.

• Both new cells bound beside the input, power and hwmon cells: "macsmc-reboot: Handling reboot and poweroff
  requests via SMC", "macsmc-rtc: registered as rtc0", and the system clock set from it at 1.22 s.
• rtc0 read 22:42:07 against the system's 22:42:08 UTC, 100 s after boot.
• The reboot at the end went through the SMC ("Preparing for reboot (rest)", "Preparing SMC for atomic mode",
  "Issuing restart (phra)"), and the machine came back on its default kernel.
• No panic, BUG, Oops, WARNING or SError line.
• Builds on mfd: macsmc: Support T6050 power and pcIO consumers #479: 0 errors, 0 warnings in the kernel. checkpatch --strict: clean.

Not tested

• The guest with this commit (its DT has neither child, so nothing changes for it by construction).
• poweroff on this branch's own build: it turns the Studio off, and the Studio is remote. The same code (this
  commit's patch, on our series with mfd: macsmc: Support T6050 power and pcIO consumers #479) powered the Studio off once on 2026-11-02: ping stopped 4 s after
  systemctl poweroff and stayed down until the power button was pressed, and the RTC kept time through the off
  state.

Dependencies

#479 (t6050/smc). The J775D DT with the reboot and rtc children comes with the J775D board.

For dj

Is #479 the right place for this, or would you rather take it after #479 reaches aurora-wip?

[funkzy]

Closing: carried in funkzy/j775d in aurora-silicon/linux-aurora, the consolidated M5 Ultra branch dj merges in one go.