interconnect: qcom: Add bandwidth limiter support for QLI targets

[MuraliKrishnaboina-16]

Introduce a sysfs interface to allow userspace-controlled bandwidth limiting for QLI targets.

The current PMU-based scaling using static DDR-CPU operating points is overly aggressive for certain workloads and results in power regressions. Provide a fine-grained mechanism to restrict bandwidth at the client level, enabling better control of interconnect usage.

This improves power efficiency by allowing targeted bandwidth throttling for specific clients and workloads.

List of all the interconnect clients are populated inside /sys/kernel/interconnect folder and each client's voting can be limited by setting the limit_ab, limit_ib and limit_commit sysfs options present inside the path folder.

Following would be the directory structure.

• soc:qcom,dcvs:llcc:sp
  • chm_apps-qns_llcc --> path used by the client - limit_ab --> AB limit in KBps - limit_ib --> IB limit in KBps - limit_commit --> limits will be applied once commit is set

[qswat-orbit-external]

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