diff options
| author | Breno Leitao <leitao@debian.org> | 2026-08-05 07:52:36 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-08-10 11:47:20 -1000 |
| commit | a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 (patch) | |
| tree | 39f5b258386e1127d253d293194e9a2991bf3c34 /Documentation/hwmon/tmp421.rst | |
| download | linux-stable-a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656.tar.gz linux-stable-a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656.zip | |
workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted
apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.
No functional change: only unbound workqueues reach apply_wqattrs_*()
today.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation/hwmon/tmp421.rst')
| -rw-r--r-- | Documentation/hwmon/tmp421.rst | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/Documentation/hwmon/tmp421.rst b/Documentation/hwmon/tmp421.rst new file mode 100644 index 000000000..a3002117b --- /dev/null +++ b/Documentation/hwmon/tmp421.rst @@ -0,0 +1,76 @@ +Kernel driver tmp421 +==================== + +Supported chips: + + * Texas Instruments TMP421 + + Prefix: 'tmp421' + + Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f + + Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html + + * Texas Instruments TMP422 + + Prefix: 'tmp422' + + Addresses scanned: I2C 0x4c, 0x4d, 0x4e and 0x4f + + Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html + + * Texas Instruments TMP423 + + Prefix: 'tmp423' + + Addresses scanned: I2C 0x4c and 0x4d + + Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html + + * Texas Instruments TMP441 + + Prefix: 'tmp441' + + Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f + + Datasheet: https://www.ti.com/product/tmp441 + + * Texas Instruments TMP442 + + Prefix: 'tmp442' + + Addresses scanned: I2C 0x4c and 0x4d + + Datasheet: https://www.ti.com/product/tmp442 + +Authors: + + Andre Prendel <andre.prendel@gmx.de> + +Description +----------- + +This driver implements support for Texas Instruments TMP421, TMP422, +TMP423, TMP441, and TMP442 temperature sensor chips. These chips +implement one local and up to one (TMP421, TMP441), up to two (TMP422, +TMP442) or up to three (TMP423) remote sensors. Temperature is measured +in degrees Celsius. The chips are wired over I2C/SMBus and specified +over a temperature range of -40 to +125 degrees Celsius. Resolution +for both the local and remote channels is 0.0625 degree C. + +The chips support only temperature measurement. The driver exports +the temperature values via the following sysfs files: + +**temp[1-4]_input** + +**temp[2-4]_fault** + +Each sensor can be individually disabled via Devicetree or from sysfs +via: + +**temp[1-4]_enable** + +If labels were specified in Devicetree, additional sysfs files will +be present: + +**temp[1-4]_label** |
