commit b55847f2a3c973678eecded0ba6fbc6064ee82b4
author Harshit Aghera <haghera@nvidia.com> Tue May 27 14:53:56 2025 +0530
committer Aditya Kurdunkar <akurdunkar@nvidia.com> Wed Jun 18 17:11:51 2025 +0530
tree c46e928fd590e0b5f2b18990ee61cbac4da55e68
parent 128c91da0eccc3c1ea919020183bac37e9754ab3

nvidia-gpu: add voltage sensor

This commit introduces a voltage sensor for the GPU.

Tested: Build an image for gb200nvl-obmc machine with the following
patches cherry picked. This patches are needed to enable the mctp stack.

https://gerrit.openbmc.org/c/openbmc/openbmc/+/79422

```
$ curl -s -k -u 'root:0penBmc' https://10.137.203.137/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/voltage_NVIDIA_GB200_GPU_0_Voltage_0
{
  "@odata.id": "/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/voltage_NVIDIA_GB200_GPU_0_Voltage_0",
  "@odata.type": "#Sensor.v1_2_0.Sensor",
  "Id": "voltage_NVIDIA_GB200_GPU_0_Voltage_0",
  "Name": "NVIDIA GB200 GPU 0 Voltage 0",
  "Reading": 0.735,
  "ReadingRangeMax": 1.8446744073709552e+16,
  "ReadingRangeMin": 0.0,
  "ReadingType": "Voltage",
  "ReadingUnits": "V",
  "Status": {
    "Health": "OK",
    "State": "Enabled"
  }
}%
```

Change-Id: I3d98f3d7c11221a42460c6f8420c927c1b1711b2
Signed-off-by: Harshit Aghera <haghera@nvidia.com>

src/nvidia-gpu/NvidiaGpuDevice.hpp

diff --git a/src/nvidia-gpu/NvidiaGpuDevice.hpp b/src/nvidia-gpu/NvidiaGpuDevice.hpp
index 0a85b9d..6cfed42 100644
--- a/src/nvidia-gpu/NvidiaGpuDevice.hpp
+++ b/src/nvidia-gpu/NvidiaGpuDevice.hpp
@@ -12,6 +12,7 @@
 #include "NvidiaGpuSensor.hpp"
 
 #include <NvidiaGpuEnergySensor.hpp>
+#include <NvidiaGpuVoltageSensor.hpp>
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/steady_timer.hpp>
 #include <sdbusplus/asio/connection.hpp>
@@ -58,6 +59,7 @@
     std::shared_ptr<NvidiaGpuTempSensor> tLimitSensor;
     std::shared_ptr<NvidiaGpuPowerSensor> powerSensor;
     std::shared_ptr<NvidiaGpuEnergySensor> energySensor;
+    std::shared_ptr<NvidiaGpuVoltageSensor> voltageSensor;
 
     SensorConfigs configs;