| .. 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. |
