There's a standard like ACPI for Arm devices - it's called ACPI, and it's a requirement for the non-Devicetree SystemReady spec (https://www.arm.com/architectur

There's a standard like ACPI for Arm devices - it's called ACPI, and it's a requirement for the non-Devicetree SystemReady spec (https://www.arm.com/architecture/system-architectures/systemready-compliance-program/systemready-band https://www.arm.com/architecture/system-architectures/system...). But it doesn't describe the huge range of weirdness that exists in the more embedded end of the Arm world, and it's functionally impossible for it to do so while Arm vendors see devices as an integrated whole rather than a general purpose device that can have commodity operating systems installed on them.