diff --git a/extensions/openpower-pels/device_callouts.hpp b/extensions/openpower-pels/device_callouts.hpp
new file mode 100644
index 0000000..2945f25
--- /dev/null
+++ b/extensions/openpower-pels/device_callouts.hpp
@@ -0,0 +1,149 @@
+#pragma once
+
+#include "pel_types.hpp"
+
+#include <filesystem>
+#include <nlohmann/json.hpp>
+#include <string>
+#include <tuple>
+#include <vector>
+
+/**
+ * @file device_callouts.hpp
+ *
+ * @brief Looks up FRU callouts, which are D-Bus inventory paths,
+ * in JSON for device sysfs paths.
+ *
+ * The code will extract the search keys from the sysfs path to
+ * use to look up the callout list in the JSON.  The callouts will
+ * be sorted by priority as defined in th PEL spec.
+ *
+ * The JSON is normally generated from the MRW, and contains
+ * sections for the following types of callouts:
+ *   * I2C  (also based on bus/addr as well as the path)
+ *   * FSI
+ *   * FSI-I2C
+ *   * FSI-SPI
+ *
+ * The JSON looks like:
+ *
+ * "I2C":
+ *   "<bus>":
+ *     "<address>":
+ *       "Callouts": [
+ *          {
+ *             "LocationCode": "<location code>",
+ *             "Name": "<inventory path>",
+ *             "Priority": "<priority=H/M/L>",
+ *             "MRU": "<optional MRU name>"
+ *          },
+ *          ...
+ *       ],
+ *       "Dest": "<destination MRW target>"
+ *
+ * "FSI":
+ *   "<fsi link>":
+ *     "Callouts": [
+ *            ...
+ *     ],
+ *     "Dest": "<destination MRW target>"
+ *
+ * "FSI-I2C":
+ *    "<fsi link>":
+ *      "<bus>":
+ *        "<address>":
+ *            "Callouts": [
+ *                   ...
+ *             ],
+ *            "Dest": "<destination MRW target>"
+ *
+ * "FSI-SPI":
+ *    "<fsi link>":
+ *      "<bus>":
+ *         "Callouts": [
+ *                ...
+ *         ],
+ *         "Dest": "<destination MRW target>"
+ *
+ */
+
+namespace openpower::pels::device_callouts
+{
+
+/**
+ * @brief Represents a callout in the device JSON.
+ *
+ * The debug field will only be filled in for the first
+ * callout in the list of them and contains additional
+ * information about what happened when looking up the
+ * callouts that is meant to aid in debug.
+ */
+struct Callout
+{
+    std::string priority;
+    std::string locationCode;
+    std::string name;
+    std::string mru;
+    std::string debug;
+};
+
+/**
+ * @brief Looks up the callouts in a JSON File to add to a PEL
+ *        for when the path between the BMC and the device specified
+ *        by the passed in device path needs to be called out.
+ *
+ * The path is the path used to access the device in sysfs.  It
+ * can be either a directory path or a file path.
+ *
+ * @param[in] devPath - The device path
+ * @param[in] compatibleList - The list of compatible names for this
+ *                             system.
+ * @return std::vector<Callout> - The list of callouts
+ */
+std::vector<Callout>
+    getCallouts(const std::string& devPath,
+                const std::vector<std::string>& compatibleList);
+
+/**
+ * @brief Looks up the callouts to add to a PEL for when the path
+ *        between the BMC and the device specified by the passed in
+ *        I2C bus and address needs to be called out.
+ *
+ * @param[in] i2cBus - The I2C bus
+ * @param[in] i2cAddress - The I2C address
+ * @param[in] compatibleList - The list of compatible names for this
+ *                             system.
+ * @return std::vector<Callout> - The list of callouts
+ */
+std::vector<Callout>
+    getI2CCallouts(size_t i2cBus, uint8_t i2cAddress,
+                   const std::vector<std::string>& compatibleList);
+
+namespace util
+{
+
+/**
+ * @brief Returns the path to the JSON file to look up callouts in.
+ *
+ * @param[in] compatibleList - The list of compatible names for this
+ *                             system.
+ *
+ * @return path - The path to the file.
+ */
+std::filesystem::path
+    getJSONFilename(const std::vector<std::string>& compatibleList);
+
+/**
+ * @brief Looks up the callouts in the JSON using the I2C keys.
+ *
+ * @param[in] i2cBus - The I2C bus
+ * @param[in] i2cAddress - The I2C address
+ * @param[in] calloutJSON - The JSON containing the callouts
+ *
+ * @return std::vector<Callout> - The callouts
+ */
+std::vector<device_callouts::Callout>
+    calloutI2C(size_t i2CBus, uint8_t i2cAddress,
+               const nlohmann::json& calloutJSON);
+} // namespace util
+} // namespace openpower::pels::device_callouts