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Linux/Documentation/hwmon/spd5118.rst

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Diff markup

Differences between /Documentation/hwmon/spd5118.rst (Architecture sparc) and /Documentation/hwmon/spd5118.rst (Architecture alpha)


  1 .. SPDX-License-Identifier: GPL-2.0-or-later        1 .. SPDX-License-Identifier: GPL-2.0-or-later
  2                                                     2 
  3 Kernel driver spd5118                               3 Kernel driver spd5118
  4 =====================                               4 =====================
  5                                                     5 
  6 Supported chips:                                    6 Supported chips:
  7                                                     7 
  8   * SPD5118 (JEDEC JESD300) compliant temperat      8   * SPD5118 (JEDEC JESD300) compliant temperature sensor chips
  9                                                     9 
 10     JEDEC standard download:                       10     JEDEC standard download:
 11         https://www.jedec.org/standards-docume     11         https://www.jedec.org/standards-documents/docs/jesd300-5b01
 12         (account required)                         12         (account required)
 13                                                    13 
 14                                                    14 
 15     Prefix: 'spd5118'                              15     Prefix: 'spd5118'
 16                                                    16 
 17     Addresses scanned: I2C 0x50 - 0x57             17     Addresses scanned: I2C 0x50 - 0x57
 18                                                    18 
 19 Author:                                            19 Author:
 20         Guenter Roeck <linux@roeck-us.net>          20         Guenter Roeck <linux@roeck-us.net>
 21                                                    21 
 22                                                    22 
 23 Description                                        23 Description
 24 -----------                                        24 -----------
 25                                                    25 
 26 This driver implements support for SPD5118 (JE     26 This driver implements support for SPD5118 (JEDEC JESD300) compliant temperature
 27 sensors, which are used on many DDR5 memory mo     27 sensors, which are used on many DDR5 memory modules. Some systems use the sensor
 28 to prevent memory overheating by automatically     28 to prevent memory overheating by automatically throttling the memory controller.
 29                                                    29 
 30 The driver auto-detects SPD5118 compliant chip     30 The driver auto-detects SPD5118 compliant chips, but can also be instantiated
 31 using devicetree/firmware nodes.                   31 using devicetree/firmware nodes.
 32                                                    32 
 33 A SPD5118 compliant chip supports a single tem     33 A SPD5118 compliant chip supports a single temperature sensor. Critical minimum,
 34 minimum, maximum, and critical temperature can     34 minimum, maximum, and critical temperature can be configured. There are alarms
 35 for low critical, low, high, and critical thre     35 for low critical, low, high, and critical thresholds.
 36                                                    36 
 37                                                    37 
 38 Hardware monitoring sysfs entries                  38 Hardware monitoring sysfs entries
 39 ---------------------------------                  39 ---------------------------------
 40                                                    40 
 41 ======================= ======================     41 ======================= ==================================
 42 temp1_input             Temperature (RO)           42 temp1_input             Temperature (RO)
 43 temp1_lcrit             Low critical high temp     43 temp1_lcrit             Low critical high temperature (RW)
 44 temp1_min               Minimum temperature (R     44 temp1_min               Minimum temperature (RW)
 45 temp1_max               Maximum temperature (R     45 temp1_max               Maximum temperature (RW)
 46 temp1_crit              Critical high temperat     46 temp1_crit              Critical high temperature (RW)
 47                                                    47 
 48 temp1_lcrit_alarm       Temperature low critic     48 temp1_lcrit_alarm       Temperature low critical alarm
 49 temp1_min_alarm         Temperature low alarm      49 temp1_min_alarm         Temperature low alarm
 50 temp1_max_alarm         Temperature high alarm     50 temp1_max_alarm         Temperature high alarm
 51 temp1_crit_alarm        Temperature critical a     51 temp1_crit_alarm        Temperature critical alarm
 52 ======================= ======================     52 ======================= ==================================
 53                                                    53 
 54 Alarm attributes are sticky until read and wil     54 Alarm attributes are sticky until read and will be cleared afterwards
 55 unless the alarm condition still applies.          55 unless the alarm condition still applies.
 56                                                    56 
 57                                                    57 
 58 SPD (Serial Presence Detect) support               58 SPD (Serial Presence Detect) support
 59 ------------------------------------               59 ------------------------------------
 60                                                    60 
 61 The driver also supports reading the SPD NVRAM     61 The driver also supports reading the SPD NVRAM on SPD5118 compatible chips.
 62 SPD data is available from the 'eeprom' binary     62 SPD data is available from the 'eeprom' binary attribute file attached to the
 63 chip's I2C device.                                 63 chip's I2C device.
                                                      

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