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cpufreq: apple: Add T6050 profile with explicit thermal ownership - #249

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Add the private T6050 command-state DVFS profile while preserving the newer public transition verification, failed-transition poisoning and thermal policies on existing SoCs. The profile supports five-bit OPP IDs supplied by DT and a conservative 2000 us transaction bound; command readback is not measured frequency.

Require apple,firmware-managed-thermal on the matched cluster. The boot producer must retain active firmware thermal control and qualify it for every published OPP, including after PMP reinitialization. The driver refuses registration without that contract. This does not invent a safe frequency ceiling, program voltage/PLL controls, or assert that current M5 hardware is qualified. The guest-DT migration tool deliberately does not add the assertion.

Validation: native arm64 driver object, binding validation and whitespace checks passed. Frequency transitions and firmware thermal ownership require hardware qualification before enabling this profile on a boot tree. No GPU changes.

Stacked on #248 for review ordering; DVFS has no display-driver dependency.

Port the command-state profile without replacing newer transition and
thermal protections. Require a boot-producer assertion that retained
firmware thermal control is qualified for every published OPP.

Keep voltage, PLL and firmware throttling configuration inherited. Do
not invent a safe frequency ceiling or add the assertion during generic
DT migration. Hardware transition qualification remains pending.

Signed-off-by: Dj <hey@djdev.me>
@DjDeveloperr

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Superseded by #481, refreshed from the current T6050 source onto Linux 7.3 integration. The new shared base is #472; all feature PRs now target t6050/base. Closing this stale chained version and keeping its branch for history.

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