Kernel driver tvs-mpfsÂķ

Supported chips:

  • PolarFire SoC

Authors:

DescriptionÂķ

This driver implements support for the temperature and voltage sensors on PolarFire SoC. The temperature reports how hot the die is, and the voltages are the SoC’s 1.05, 1.8 and 2.5 volt rails respectively.

Usage NotesÂķ

update_interval has a permitted range of 0 to 8 milliseconds.

Temperatures are read in millidegrees Celsius, but the hardware measures in degrees Kelvin, storing the result as 11.4 fixed point data, for a maximum value of 2047.9375 degrees Kelvin.

Voltages are read in millivolts. The hardware measures in millivolts, storing the value as 12.3 fixed point data, for a maximum of 4095.875 millivolts. The minimum value reportable by the driver is 0 volts, although the hardware is capable of measuring negative values.

Sysfs entriesÂķ

The following attributes are supported. update_interval is read-write, as are the enables. All other attributes are read only.

temp1_label

Fixed name for channel.

temp1_input

Measured temperature for channel.

temp1_enable

Enable/disable for channel.

in[0-2]_label

Fixed name for channel.

in[0-2]_input

Measured voltage for channel.

in[0-2]_enable

Enable/disable for channel.

update_interval

The interval at which the chip will update readings.