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| author | Guenter Roeck <linux@roeck-us.net> | 2024-05-27 19:49:10 +0200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2024-06-10 18:13:41 +0200 |
| commit | 09262e9814ca0851c937cab1f26df4ab207885a1 (patch) | |
| tree | e70042f35646f18c87ffae5d6c6109d1611a872a /Documentation/hwmon | |
| parent | dt-bindings: trivial-devices: Add jedec,spd5118 (diff) | |
| download | linux-09262e9814ca0851c937cab1f26df4ab207885a1.tar.xz linux-09262e9814ca0851c937cab1f26df4ab207885a1.zip | |
hwmon: Add support for SPD5118 compliant temperature sensors
Add support for SPD5118 (Jedec JESD300) compliant temperature
sensors. Such sensors are typically found on DDR5 memory modules.
Cc: René Rebe <rene@exactcode.de>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Stephen Horvath <s.horvath@outlook.com.au>
Tested-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/hwmon/spd5118.rst | 55 |
2 files changed, 56 insertions, 0 deletions
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 03d313af469a..6e7b8726b60c 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -215,6 +215,7 @@ Hardware Monitoring Kernel Drivers smsc47m192 smsc47m1 sparx5-temp + spd5118 stpddc60 surface_fan sy7636a-hwmon diff --git a/Documentation/hwmon/spd5118.rst b/Documentation/hwmon/spd5118.rst new file mode 100644 index 000000000000..a15d75aa2066 --- /dev/null +++ b/Documentation/hwmon/spd5118.rst @@ -0,0 +1,55 @@ +.. 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. |