diff --git a/include/ethosu_driver.h b/include/ethosu_driver.h
index 46f777a..d47b676 100644
--- a/include/ethosu_driver.h
+++ b/include/ethosu_driver.h
@@ -44,6 +44,7 @@
     uint64_t fast_memory;
     size_t fast_memory_size;
     bool status_error;
+    bool dev_power_always_on;
 };
 
 struct ethosu_version_id
@@ -126,6 +127,11 @@
  */
 void ethosu_irq_handler(void);
 
+/**
+ * Set Ethos-U power mode.
+ */
+void ethosu_set_power_mode(bool);
+
 #ifdef __cplusplus
 }
 #endif