1.. SPDX-License-Identifier: GPL-2.0-or-later 2 3Kernel driver sbtsi_temp 4======================== 5 6Supported hardware: 7 8 * Sideband interface (SBI) Temperature Sensor Interface (SB-TSI) 9 compliant AMD SoC temperature device. 10 11 Prefix: 'sbtsi_temp' 12 13 Addresses scanned: This driver doesn't support address scanning. 14 15 To instantiate this driver on an AMD CPU with SB-TSI 16 support, the i2c bus number would be the bus connected from the board 17 management controller (BMC) to the CPU. The i2c address is specified in 18 Section 6.3.1 of the SoC register reference: The SB-TSI address is normally 19 98h for socket 0 and 90h for socket 1, but it could vary based on hardware 20 address select pins. 21 22 Datasheet: The SB-TSI interface and protocol is available as part of 23 the open source SoC register reference at: 24 25 https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf 26 27 The Advanced Platform Management Link (APML) Specification is 28 available at: 29 30 http://developer.amd.com/wordpress/media/2012/10/41918.pdf 31 32Author: Kun Yi <kunyi@google.com> 33 34Description 35----------- 36 37The SBI temperature sensor interface (SB-TSI) is an emulation of the software 38and physical interface of a typical 8-pin remote temperature sensor (RTS) on 39AMD SoCs. It implements one temperature sensor with readings and limit 40registers encode the temperature in increments of 0.125 from 0 to 255.875. 41Limits can be set through the writable thresholds, and if reached will trigger 42corresponding alert signals. 43