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[nrf fromlist] soc: nordic: nrf54h: s2ram: Add FPU retention #2993

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Add FPU power management for suspend to RAM procedures. Add FPU save/restore procedures when FPU_SHARING feature is disabled.

Add FPU power management for suspend to RAM procedures.
Add FPU save/restore procedures when `FPU_SHARING` feature
is disabled.

Upstream PR #: 92264

Signed-off-by: Adam Kondraciuk <[email protected]>
@adamkondraciuk adamkondraciuk force-pushed the NRFX-7906-add-fpu-save-restore-for-s2ram branch from edee6c5 to 4b42437 Compare June 26, 2025 16:44
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Tested machine learning application singlecore - it works fine.
There is high power consumption but it is probably due to other known issue.

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