diff --git a/platform/interface/trng.h b/platform/interface/trng.h
new file mode 100644
index 0000000..9c24581
--- /dev/null
+++ b/platform/interface/trng.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef TS_PLATFORM_INTERFACE_TRNG_H
+#define TS_PLATFORM_INTERFACE_TRNG_H
+
+/*
+ * Interface definintion for a platform trng driver.  A platform provider will
+ * provide concrete implementations of this interface for each alternative
+ * implementation supported.
+ */
+#include <stddef.h>
+#include "device_region.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Virtual interface for a platform trng driver.  A platform will provide
+ * one or more concrete implementations of this interface.
+ */
+struct platform_trng_iface
+{
+   /**
+    * \brief Poll for bytes of entropy from a platform trng
+    *
+    * \param context     Platform driver context
+    * \param output      Buffer for output
+    * \param nbyte       Desired number of bytes
+    * \param len         The number of bytes returned (could be zero)
+    *
+    * \return            0 if successful.
+    */
+    int (*poll)(void *context, unsigned char *output, size_t nbyte, size_t *len);
+};
+
+/*
+ * A platform trng driver instance.
+ */
+struct platform_trng_driver
+{
+    void *context;                              /**< Opaque driver context */
+    const struct platform_trng_iface *iface;  /**< Interface methods */
+};
+
+/**
+ * \brief Factory method to construct a platform specific trng driver
+ *
+ * \param driver    Pointer to driver structure to initialize on construction.
+ * \param device_region Pointer a device region object or NULL if none.
+ *
+ * \return          0 if successful.
+ */
+int platform_trng_create(struct platform_trng_driver *driver,
+                           const struct device_region *device_region);
+
+/**
+ * \brief Destroy a driver constructed using the factory method
+ *
+ * \param driver    Pointer to driver structure for constructed driver.
+ */
+void platform_trng_destroy(struct platform_trng_driver *driver);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* TS_PLATFORM_INTERFACE_TRNG_H */