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Add a function to put a co-processor into the lowest possible power state from which recovery usually isn't possible without a full SoC reset. This is required for the USB4/Thunderbolt co-processors which can be restarted since the entire USB4 root complex can be completely reset independently of the rest of the SoC. Reviewed-by: Janne Grunau <j@jannau.net> Link: https://patch.msgid.link/20260117-apple-rtkit-poweroff-v2-1-b882a180e44d@kernel.org Signed-off-by: Sven Peter <sven@kernel.org>