TrustZone is broken as implemented in most devices, and nobody was surprised. https://blog.acolyer.org/2017/09/21/clkscrew-exposing-the-perils-of-security-oblivious-energy-management/ …
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Modern SoCs are way, WAY too complicated. The only way to secure them is to move all the ugly hardware mgmt bits into TrustZone itself.
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Which of course increases your TZ attack surface. You can't have your cake and eat it too.
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Or have a separate CPU to do power Mgmt. And have a bunch of angry power folks yelling "but muh latencies"
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Or have a separate CPU doing security. Which is what Apple did.
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