zephyr,cpu-freq-thermal-cap

Overview

Name:

zephyr,cpu-freq-thermal-cap

Vendor:

Zephyr Project

Used in:

List of boards using this compatible

Description

CPU frequency thermal cap.

Thermal cap constraints use the performance-states child order as the
CPU frequency ordering: lower index P-states are treated as higher-performance,
higher index P-states are treated as lower-performance and more restrictive.

Properties

Top level properties

These property descriptions apply to “zephyr,cpu-freq-thermal-cap” nodes themselves. This page also describes child node properties in the following sections.

Node specific propertiesDeprecated node specific propertiesBase properties

Properties not inherited from the base binding file.

Name	Type	Details
sensor	phandle	Temperature sensor used to compute the CPU frequency thermal cap. This property is required.
sensor-channel	string	Sensor channel used for temperature samples. Default value: die-temp Legal values: die-temp, ambient-temp
polling-delay-ms	int	Polling interval in milliseconds while no thermal trip is active. Default value: 1000
trip-active-polling-delay-ms	int	Polling interval in milliseconds while one or more thermal trips are active. This is typically shorter than polling-delay-ms so cap changes and release decisions are reflected promptly. Default value: 100

Child node properties

Name	Type	Details
temperature-millicelsius	int	Temperature threshold in millicelsius. When this threshold is reached, the trip becomes active and constrains CPU frequency to cap-pstate or lower. This property is required.
hysteresis-millicelsius	int	Hysteresis in millicelsius. An active trip is released when the measured temperature falls to temperature-millicelsius minus this value. This property is required.
cap-pstate	phandle	Highest-performance P-state allowed while this trip is active. The referenced P-state must belong to the ordered performance-states table. This property is required.