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Date:   Wed,  2 Dec 2020 08:56:00 -0800
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Subject: [PATCH linux hwmon-next v4 2/3] hwmon: (sbtsi) Add documentation
From:   Kun Yi <kunyi@google.com>
To:     jdelvare@suse.com, linux@roeck-us.net, robh+dt@kernel.org,
        mark.rutland@arm.com, supreeth.venkatesh@amd.com
Cc:     Kun Yi <kunyi@google.com>, openbmc@lists.ozlabs.org,
        linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
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Precedence: bulk

Document the SB-TSI sensor interface driver.

Signed-off-by: Kun Yi <kunyi@google.com>
---
 Documentation/hwmon/index.rst      |  1 +
 Documentation/hwmon/sbtsi_temp.rst | 40 ++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 Documentation/hwmon/sbtsi_temp.rst

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index fd6fae46b99c..509fb3bcafb2 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -151,6 +151,7 @@ Hardware Monitoring Kernel Drivers
    pxe1610
    pwm-fan
    raspberrypi-hwmon
+   sbtsi_temp
    sch5627
    sch5636
    scpi-hwmon
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@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.
-- 
2.29.2.454.gaff20da3a2-goog