diff --git a/phosphor-power-supply/util.hpp b/phosphor-power-supply/util.hpp
index 92e4eeb..caa5bac 100644
--- a/phosphor-power-supply/util.hpp
+++ b/phosphor-power-supply/util.hpp
@@ -11,6 +11,7 @@
 #include <phosphor-logging/log.hpp>
 
 #include <bitset>
+#include <chrono>
 
 namespace phosphor::power::psu
 {
@@ -260,6 +261,15 @@
     void write(int value, std::bitset<32> flags) override;
 
     /**
+     * @brief Attempts to toggle (write) a GPIO low then high.
+     *
+     * Relies on write, so throws exception if line not found, etc.
+     *
+     * @param[in] delay - Milliseconds to delay betwen low/high toggle.
+     */
+    void toggleLowHigh(const std::chrono::milliseconds& delay) override;
+
+    /**
      * @brief Returns the name of the GPIO, if not empty.
      */
     std::string getName() const override;