[PATCH linux hwmon-next v2 2/3] hwmon: (sbtsi) Add documentation

Kun Yi kunyi at google.com
Tue Mar 24 10:33:53 AEDT 2020

Document the SB-TSI sensor interface driver.

Signed-off-by: Kun Yi <kunyi at google.com>
Change-Id: I4b086a124d1d94a516386b0d2ff1cd7180b1dac1
 Documentation/hwmon/sbtsi_temp.rst | 40 ++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/hwmon/sbtsi_temp.rst

diff --git a/Documentation/hwmon/sbtsi_temp.rst b/Documentation/hwmon/sbtsi_temp.rst
new file mode 100644
index 000000000000..9f0f197c8aa2
--- /dev/null
+++ b/Documentation/hwmon/sbtsi_temp.rst
@@ -0,0 +1,40 @@
+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 at google.com>
+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.

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