diff --git a/phosphor-power-supply/chassis.hpp b/phosphor-power-supply/chassis.hpp
new file mode 100644
index 0000000..527b0ff
--- /dev/null
+++ b/phosphor-power-supply/chassis.hpp
@@ -0,0 +1,189 @@
+#pragma once
+
+#include "power_supply.hpp"
+#include "types.hpp"
+#include "utility.hpp"
+
+#include <phosphor-logging/lg2.hpp>
+#include <sdbusplus/bus.hpp>
+#include <sdbusplus/bus/match.hpp>
+#include <sdbusplus/server/manager.hpp>
+#include <sdbusplus/server/object.hpp>
+#include <sdeventplus/event.hpp>
+#include <sdeventplus/utility/timer.hpp>
+#include <xyz/openbmc_project/State/Decorator/PowerSystemInputs/server.hpp>
+
+#include <map>
+#include <string>
+#include <vector>
+
+struct SupportedPsuConfiguration
+{
+    int powerSupplyCount;
+    std::vector<uint64_t> inputVoltage;
+    bool powerConfigFullLoad;
+};
+
+using namespace phosphor::power::psu;
+
+namespace phosphor::power::chassis
+{
+
+constexpr uint32_t invalidObjectPathUniqueId = 9999;
+using PowerSystemInputsInterface = sdbusplus::xyz::openbmc_project::State::
+    Decorator::server::PowerSystemInputs;
+using PowerSystemInputsObject =
+    sdbusplus::server::object_t<PowerSystemInputsInterface>;
+
+// Validation timeout. Allow 30s to detect if new EM interfaces show up in D-Bus
+// before performing the validation.
+// Previously the timer was set to 10 seconds was too short, it results in
+// incorrect errors being logged, but no real consequence of longer timeout.
+constexpr auto validationTimeout = std::chrono::seconds(30);
+
+/**
+ * @class Chassis
+ *
+ * @brief This class will create an object used to manage and monitor a list of
+ * power supply devices attached to the chassis.
+ */
+class Chassis
+{
+  public:
+    Chassis() = delete;
+    ~Chassis() = default;
+    Chassis(const Chassis&) = delete;
+    Chassis& operator=(const Chassis&) = delete;
+    Chassis(Chassis&&) = delete;
+    Chassis& operator=(Chassis&&) = delete;
+
+    /**
+     * @brief Constructor to read configuration from D-Bus.
+     *
+     * @param[in] bus - D-Bus bus object
+     * @param[in] chassisPath - Chassis path
+     */
+    Chassis(sdbusplus::bus_t& bus, const std::string& chassisPath);
+
+    /**
+     * @brief Get the status of Power on.
+     */
+    bool isPowerOn()
+    {
+        return powerOn;
+    }
+
+  private:
+    /**
+     * @brief The D-Bus object
+     */
+    sdbusplus::bus_t& bus;
+
+    /**
+     * @brief The timer that performs power supply validation as the entity
+     * manager interfaces show up in d-bus.
+     */
+    std::unique_ptr<
+        sdeventplus::utility::Timer<sdeventplus::ClockId::Monotonic>>
+        validationTimer;
+
+    /** @brief True if the power is on. */
+    bool powerOn = false;
+
+    /** @brief Used to subscribe to D-Bus power supply presence changes */
+    std::vector<std::unique_ptr<sdbusplus::bus::match_t>> presenceMatches;
+
+    /**
+     * @brief Flag to indicate if the validateConfig() function should be run.
+     * Set to false once the configuration has been validated to avoid
+     * running multiple times due to interfaces added signal. Set to
+     * true during power off to trigger the validation on power on.
+     */
+    bool runValidateConfig = true;
+
+    /**
+     * @brief Map of supported PSU configurations that include the model name
+     * and their properties.
+     */
+    std::map<std::string, SupportedPsuConfiguration> supportedConfigs;
+
+    /**
+     * @brief The vector for power supplies.
+     */
+    std::vector<std::unique_ptr<PowerSupply>> psus;
+
+    /**
+     * @brief The device driver name for all power supplies.
+     */
+    std::string driverName;
+
+    /**
+     * @brief Chassis D-Bus object path
+     */
+    std::string chassisPath;
+
+    /**
+     * @brief The Chassis path unique ID
+     */
+    uint32_t chassisPathUniqueId = invalidObjectPathUniqueId;
+
+    /**
+     * @brief Get PSU properties from D-Bus, use that to build a power supply
+     * object.
+     *
+     * @param[in] properties - A map of property names and values
+     */
+    void getPSUProperties(util::DbusPropertyMap& properties);
+
+    /**
+     * @brief Get PSU configuration from D-Bus
+     */
+    void getPSUConfiguration();
+
+    /**
+     * @brief Initialize the chassis's supported configuration from the
+     * Supported Configuration D-Bus object provided by the Entity
+     * Manager.
+     */
+    void getSupportedConfiguration();
+
+    /**
+     * @brief Callback for inventory property changes
+     *
+     * Process change of the Power Supply presence.
+     *
+     * @param[in]  msg - Data associated with the Present change signal
+     **/
+    void psuPresenceChanged(sdbusplus::message_t& msg);
+
+    /**
+     * @brief Helper function to populate the PSU supported configuration
+     *
+     * @param[in] properties - A map of property names and values
+     */
+    void populateSupportedConfiguration(
+        const util::DbusPropertyMap& properties);
+
+    /**
+     * @brief Build the device driver name for the power supply.
+     *
+     * @param[in] i2cbus - i2c bus
+     * @param[in] i2caddr - i2c bus address
+     */
+    void buildDriverName(uint64_t i2cbus, uint64_t i2caddr);
+
+    /**
+     * @brief Find PSU with device driver name, then populate the device
+     * driver name to all PSUs (including missing PSUs).
+     */
+    void populateDriverName();
+
+    /**
+     * @brief Get chassis path unique ID.
+     *
+     * @return uint32_t - Chassis path unique ID.
+     */
+    uint32_t getChassisPathUniqueId();
+};
+
+} // namespace phosphor::power::chassis