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- .. SPDX-License-Identifier: GPL-2.0-or-later
- Kernel driver spd5118
- =====================
- Supported chips:
- * SPD5118 (JEDEC JESD300) compliant temperature sensor chips
- JEDEC standard download:
- https://www.jedec.org/standards-documents/docs/jesd300-5b01
- (account required)
- Prefix: 'spd5118'
- Addresses scanned: I2C 0x50 - 0x57
- Author:
- Guenter Roeck <linux@roeck-us.net>
- Description
- -----------
- This driver implements support for SPD5118 (JEDEC JESD300) compliant temperature
- sensors, which are used on many DDR5 memory modules. Some systems use the sensor
- to prevent memory overheating by automatically throttling the memory controller.
- The driver auto-detects SPD5118 compliant chips, but can also be instantiated
- using devicetree/firmware nodes.
- A SPD5118 compliant chip supports a single temperature sensor. Critical minimum,
- minimum, maximum, and critical temperature can be configured. There are alarms
- for low critical, low, high, and critical thresholds.
- Hardware monitoring sysfs entries
- ---------------------------------
- ======================= ==================================
- temp1_input Temperature (RO)
- temp1_lcrit Low critical high temperature (RW)
- temp1_min Minimum temperature (RW)
- temp1_max Maximum temperature (RW)
- temp1_crit Critical high temperature (RW)
- temp1_lcrit_alarm Temperature low critical alarm
- temp1_min_alarm Temperature low alarm
- temp1_max_alarm Temperature high alarm
- temp1_crit_alarm Temperature critical alarm
- ======================= ==================================
- Alarm attributes are sticky until read and will be cleared afterwards
- unless the alarm condition still applies.
- SPD (Serial Presence Detect) support
- ------------------------------------
- The driver also supports reading the SPD NVRAM on SPD5118 compatible chips.
- SPD data is available from the 'eeprom' binary attribute file attached to the
- chip's I2C device.
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