diff --git a/phosphor-power-sequencer/src/ucd90320_device.cpp b/phosphor-power-sequencer/src/ucd90320_device.cpp
new file mode 100644
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+++ b/phosphor-power-sequencer/src/ucd90320_device.cpp
@@ -0,0 +1,82 @@
+/**
+ * Copyright © 2024 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ucd90320_device.hpp"
+
+#include "format_utils.hpp"
+#include "standard_device.hpp"
+
+#include <array>
+#include <format>
+#include <span>
+
+namespace phosphor::power::sequencer
+{
+
+/**
+ * Group of GPIO values that should be formatted together.
+ */
+struct GPIOGroup
+{
+    std::string additionalDataName;
+    std::string journalName;
+    unsigned int offset;
+    unsigned int count;
+};
+
+/**
+ * UCD90320-specific groups of GPIO values.
+ *
+ * The offsets correspond to the Pin IDs defined in the UCD90320 PMBus interface
+ * documentation.  These Pin IDs are the same as the libgpiod line offsets used
+ * to obtain the GPIO values.
+ */
+static const std::array<GPIOGroup, 5> gpioGroups = {
+    GPIOGroup{"MAR01_24_GPIO_VALUES", "MAR01-24", 0, 24},
+    GPIOGroup{"EN1_32_GPIO_VALUES", "EN1-32", 24, 32},
+    GPIOGroup{"LGP01_16_GPIO_VALUES", "LGP01-16", 56, 16},
+    GPIOGroup{"DMON1_8_GPIO_VALUES", "DMON1-8", 72, 8},
+    GPIOGroup{"GPIO1_4_GPIO_VALUES", "GPIO1-4", 80, 4}};
+
+void UCD90320Device::storeGPIOValues(
+    Services& services, const std::vector<int>& values,
+    std::map<std::string, std::string>& additionalData)
+{
+    // Verify the expected number of GPIO values were passed in
+    unsigned int expectedCount = gpioGroups.back().offset +
+                                 gpioGroups.back().count;
+    if (values.size() != expectedCount)
+    {
+        // Unexpected number of values; store as a plain list of integers
+        StandardDevice::storeGPIOValues(services, values, additionalData);
+        return;
+    }
+
+    // Store GPIO groups in additional data and journal
+    services.logInfoMsg(std::format("Device {} GPIO values:", name));
+    auto span = std::span{values};
+    std::string valuesStr;
+    for (const GPIOGroup& group : gpioGroups)
+    {
+        valuesStr =
+            format_utils::toString(span.subspan(group.offset, group.count));
+        additionalData.emplace(group.additionalDataName, valuesStr);
+        services.logInfoMsg(
+            std::format("{}: {}", group.journalName, valuesStr));
+    }
+}
+
+} // namespace phosphor::power::sequencer