2020-12-11 14:54:26 -07:00
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.. SPDX-License-Identifier: GPL-2.0-or-later
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Kernel driver sbtsi_temp
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2020-12-28 20:54:28 -07:00
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========================
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2020-12-11 14:54:26 -07:00
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Supported hardware:
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* Sideband interface (SBI) Temperature Sensor Interface (SB-TSI)
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compliant AMD SoC temperature device.
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Prefix: 'sbtsi_temp'
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Addresses scanned: This driver doesn't support address scanning.
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To instantiate this driver on an AMD CPU with SB-TSI
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support, the i2c bus number would be the bus connected from the board
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management controller (BMC) to the CPU. The i2c address is specified in
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Section 6.3.1 of the SoC register reference: The SB-TSI address is normally
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98h for socket 0 and 90h for socket 1, but it could vary based on hardware
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address select pins.
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Datasheet: The SB-TSI interface and protocol is available as part of
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the open source SoC register reference at:
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https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf
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The Advanced Platform Management Link (APML) Specification is
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available at:
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http://developer.amd.com/wordpress/media/2012/10/41918.pdf
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Author: Kun Yi <kunyi@google.com>
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Description
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-----------
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The SBI temperature sensor interface (SB-TSI) is an emulation of the software
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and physical interface of a typical 8-pin remote temperature sensor (RTS) on
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AMD SoCs. It implements one temperature sensor with readings and limit
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registers encode the temperature in increments of 0.125 from 0 to 255.875.
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Limits can be set through the writable thresholds, and if reached will trigger
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corresponding alert signals.
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