The phosphor-regulators application configures and monitors voltage
regulators. The application is controlled by a JSON configuration file.
The application does not control how voltage regulators are enabled or how to monitor their Power Good (pgood) status. Those operations are typically performed by power sequencer hardware and related firmware.
The configuration of voltage regulators can be modified. Configuration changes usually override hardware default settings.
The most common configuration change is setting the output voltage for a regulator rail. Other examples include modifying pgood thresholds and overcurrent settings.
The configuration changes are applied early in the boot process before regulators are enabled.
Two types of regulator monitoring are supported:
- Sensor monitoring
- Phase fault monitoring
The sensor values for a voltage rail are read, such as voltage output, current output, and temperature. Sensor values are measured, actual values rather than target values.
Sensors are read once per second. The sensor values are stored on D-Bus on the BMC, making them available to external interfaces like Redfish.
Some voltage regulators contain redundant phases. If a redundant phase fails, the regulator can continue functioning normally. However redundancy has been lost, and the regulator may fail if another phase fails.
Voltage regulators can be monitored for redundant phase faults. If a fault is detected, an error is logged on the BMC.
The JSON configuration file defines the following:
- Voltage regulators in the system.
- Operations to perform on those regulators, such as configuration or sensor monitoring.
Configuration files are stored in the config_files directory.
See the configuration file documentation for information on the file format, validation tool, and installation directories.