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Tip revision: e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62 authored by Linus Torvalds on 03 January 2021, 23:55:30 UTC
Linux 5.11-rc2
Linux 5.11-rc2
Tip revision: e71ba94
sbtsi_temp.rst
.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver sbtsi_temp
==================
Supported hardware:
* Sideband interface (SBI) Temperature Sensor Interface (SB-TSI)
compliant AMD SoC temperature device.
Prefix: 'sbtsi_temp'
Addresses scanned: This driver doesn't support address scanning.
To instantiate this driver on an AMD CPU with SB-TSI
support, the i2c bus number would be the bus connected from the board
management controller (BMC) to the CPU. The i2c address is specified in
Section 6.3.1 of the SoC register reference: The SB-TSI address is normally
98h for socket 0 and 90h for socket 1, but it could vary based on hardware
address select pins.
Datasheet: The SB-TSI interface and protocol is available as part of
the open source SoC register reference at:
https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf
The Advanced Platform Management Link (APML) Specification is
available at:
http://developer.amd.com/wordpress/media/2012/10/41918.pdf
Author: Kun Yi <kunyi@google.com>
Description
-----------
The SBI temperature sensor interface (SB-TSI) is an emulation of the software
and physical interface of a typical 8-pin remote temperature sensor (RTS) on
AMD SoCs. It implements one temperature sensor with readings and limit
registers encode the temperature in increments of 0.125 from 0 to 255.875.
Limits can be set through the writable thresholds, and if reached will trigger
corresponding alert signals.