CPU Idle

Owned by Confluence Wiki Admin (Unlicensed)
Last updated: Oct 31, 2023 by shubhro
1 min read



Introduction

This page gives an overview of the CPU idledriver which is available as part of the ZynqMP Linux distribution.
Paths, files, links and documentation on this page are given relative to the Linux kernel source tree.

HW IP features

CPU idling for Zynqmp Ultrascale+ MPSoc APU.

Features supported in driver

CPU idling for Zynqmp Ultrascale+ MPSoc APU.

Missing Features, Known Issues and Limitations

Reporting power is not supported.

Kernel Configuration

The following config options should be enabled in order to build the cpufreq driver
CPU Idle
[*] CPU idle PM support
[*] Ladder governor (for periodic timer tick)
ARM CPU Idle Drivers
[*] Generic ARM/ARM64 CPU idle Driver

Devicetree

cpu1: cpu@1 {
compatible = "arm,cortex-a53", "arm,armv8";
device_type = "cpu";
enable-method = "psci";
reg = <0x1>;
operating-points-v2 = <&&cpu_opp_table>;
cpu-idle-states = <&&CPU_SLEEP_0>;
};

Change Log


2023.2
Summary:
No change

2023.1
Summary:
No change

2022.2
Summary:
No change
2022.1
Summary:
No change
2021.2
Summary:
No change
2021.1
Summary:
No change
2020.2
Summary:
No change
2020.1
Summary:
No change
2019.2
Summary:
No change
2018.3
Summary:
No change
2018.2
Summary:
No change
2018.1
Summary:
No change
2017.4
Summary:
No change
2017.3
Summary:
No change

2017.2
Summary:
No change
2017.1
Summary:
  • Added cpuidle feature.
Commits:
Add idle state for ZynqMP

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