This commit adds a hwmon document for a generic PECI hwmon client driver. Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> --- Documentation/hwmon/peci-hwmon | 73 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/hwmon/peci-hwmon diff --git a/Documentation/hwmon/peci-hwmon b/Documentation/hwmon/peci-hwmon new file mode 100644 index 000000000000..93e587498536 --- /dev/null +++ b/Documentation/hwmon/peci-hwmon @@ -0,0 +1,73 @@ +Kernel driver peci-hwmon +=============================== + +Supported chips: + Any recent Intel CPU which is connected through a PECI bus. + Addresses scanned: PECI client address 0x30 - 0x37 + Datasheet: Available from http://www.intel.com/design/literature.htm + +Author: + Jae Hyun Yoo <jae.hyun.yoo@xxxxxxxxxxxxxxx> + +Description +----------- + +This driver implements a generic PECI hwmon feature which provides Digital +Thermal Sensor (DTS) thermal readings of the CPU package, CPU cores and DIMM +components that are accessible using the PECI Client Command Suite via the +processor PECI client. + +All temperature values are given in millidegree Celsius and will be measurable +only when the target CPU is powered on. + +sysfs attributes +---------------- + +temp1_input Provides current die temperature of the CPU package. +temp1_max Provides thermal control temperature of the CPU package + which is also known as Tcontrol. +temp1_crit Provides shutdown temperature of the CPU package which + is also known as the maximum processor junction + temperature, Tjmax or Tprochot. +temp1_crit_hyst Provides the hysteresis value from Tcontrol to Tjmax of + the CPU package. + +temp2_input Provides current DTS thermal margin to Tcontrol of the + CPU package. Value 0 means it reaches to Tcontrol + temperature. Sub-zero value means the die temperature + goes across Tconrtol to Tjmax. +temp2_min Provides the minimum DTS thermal margin to Tcontrol of + the CPU package. +temp2_lcrit Provides the value when the CPU package temperature + reaches to Tjmax. + +temp3_input Provides current Tcontrol temperature of the CPU + package which is also known as Fan Temperature target. + Indicates the relative value from thermal monitor trip + temperature at which fans should be engaged. +temp3_crit Provides Tcontrol critical value of the CPU package + which is same to Tjmax. + +temp4_input Provides current Tthrottle temperature of the CPU + package. Used for throttling temperature. If this value + is allowed and lower than Tjmax - the throttle will + occur and reported at lower than Tjmax. + +temp5_input Provides the maximum junction temperature, Tjmax of the + CPU package. + +temp<n>_label Provides core temperature if this label indicates + 'Core #'. +temp[n]_input Provides current temperature of each core. +temp[n]_max Provides thermal control temperature of the core. +temp[n]_crit Provides shutdown temperature of the core. +temp[n]_crit_hyst Provides the hysteresis value from Tcontrol to Tjmax of + the core. + +temp<n>_label Provides DDR DIMM temperature if this label indicates + 'DIMM #'. +temp<n>_input Provides current temperature of the DDR DIMM. + +Note: + DIMM temperature group will be appeared when the client CPU's BIOS + completes memory training and testing. -- 2.16.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
