Document the hwmon interface for the OCC. Signed-off-by: Eddie James <eajames@xxxxxxxxxxxxxxxxxx> --- Documentation/hwmon/occ | 73 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/hwmon/occ diff --git a/Documentation/hwmon/occ b/Documentation/hwmon/occ new file mode 100644 index 0000000..465fa1a --- /dev/null +++ b/Documentation/hwmon/occ @@ -0,0 +1,73 @@ +Kernel driver occ-hwmon +======================= + +Supported chips: + * POWER8 + * POWER9 + +Author: Eddie James <eajames@xxxxxxxxxxxxxxxxxx> + +Description +----------- + +This driver supports hardware monitoring for the On-Chip Controller (OCC) +embedded on POWER processors. The OCC is a device that collects and aggregates +sensor data from the processor and the system. The OCC can provide the raw +sensor data as well as perform thermal and power management on the system. + +The P8 version of this driver is a client driver of I2C. It may be probed +manually if an "ibm,p8-occ-hwmon" compatible device is found under the +appropriate I2C bus node in the device-tree. + +The P9 version of this driver is a client driver of the FSI-based OCC driver. +It will be probed automatically by the FSI-based OCC driver. + +Sysfs entries +------------- + +The following attributes are supported. All attributes are read-only unless +specified. + +temp[1-n]_label OCC sensor id. +temp[1-n]_input Measured temperature in millidegrees C. +[with temperature sensor version 2+] + temp[1-n]_fru_type Given FRU (Field Replaceable Unit) type. + temp[1-n]_fault Temperature sensor fault. + +freq[1-n]_label OCC sensor id. +freq[1-n]_input Measured frequency. + +power[1-n]_label OCC sensor id. +power[1-n]_input Measured power in microwatts. +power[1-n]_update_tag Number of 250us samples represented in accumulator. +power[1-n]_accumulator Accumulation of 250us power readings. +[with power sensor version 2+] + power[1-n]_function_id Identifies what the power reading is for. + power[1-n]_apss_channel Indicates APSS channel. + +[power version 0xa0 only] +power1_id OCC sensor id. +power[1-n]_label Sensor type, "system", "proc", "vdd", or "vdn". +power[1-n]_input Most recent power reading in microwatts. +power[1-n]_update_tag Number of samples in the accumulator. +power[1-n]_accumulator Accumulation of power readings. +[with sensor type "system" and "proc" only] + power[1-n]_update_time Time in us that the power value is read. + +caps1_current Current OCC power cap in watts. +caps1_reading Current system output power in watts. +caps1_norm Power cap without redundant power. +caps1_max Maximum power cap. +[caps version 1 and 2 only] + caps1_min Minimum power cap. +[caps version 3+] + caps1_min_hard Hard minimum cap that can be set and held. + caps1_min_soft Soft minimum cap below hard, not guaranteed. +caps1_user The powercap specified by the user. Will be 0 if no + user powercap exists. This attribute is read-write. +[caps version 1+] + caps1_user_source Indicates how the user power limit was set. + +extn[1-n]_label ASCII id or sensor id. +extn[1-n]_flags Indicates type of label attribute. +extn[1-n]_input Data. -- 1.8.3.1 -- 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
