Cpuidle Linux Driver for Zynq Ultrascale+ MPSoC

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


2017.1
Summary:
  • Added cpuidle feature.
Commits:
Add idle state for ZynqMP

2017.2
Summary:
No change

2017.3
Summary:
No change

Related Links


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