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- Arm Network-on Chip Interconnect PMU
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- NI-700 and friends implement a distinct PMU for each clock domain within the
- interconnect. Correspondingly, the driver exposes multiple PMU devices named
- arm_ni_<x>_cd_<y>, where <x> is an (arbitrary) instance identifier and <y> is
- the clock domain ID within that particular instance. If multiple NI instances
- exist within a system, the PMU devices can be correlated with the underlying
- hardware instance via sysfs parentage.
- Each PMU exposes base event aliases for the interface types present in its clock
- domain. These require qualifying with the "eventid" and "nodeid" parameters
- to specify the event code to count and the interface at which to count it
- (per the configured hardware ID as reflected in the xxNI_NODE_INFO register).
- The exception is the "cycles" alias for the PMU cycle counter, which is encoded
- with the PMU node type and needs no further qualification.
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