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diff --git a/drivers/include/fsl_vref.h b/drivers/include/fsl_vref.h
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+/*
+ * Copyright (c) 2015, Freescale Semiconductor, Inc.
+ * Copyright 2016-2017 NXP
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * o Redistributions of source code must retain the above copyright notice, this list
+ *   of conditions and the following disclaimer.
+ *
+ * o Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ *
+ * o Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _FSL_VREF_H_
+#define _FSL_VREF_H_
+
+#include "fsl_common.h"
+
+/*!
+ * @addtogroup vref
+ * @{
+ */
+
+
+/******************************************************************************
+ * Definitions
+ ******************************************************************************/
+
+/*! @name Driver version */
+/*@{*/
+#define FSL_VREF_DRIVER_VERSION (MAKE_VERSION(2, 1, 0)) /*!< Version 2.1.0. */
+/*@}*/
+
+/* Those macros below defined to support SoC family which have VREFL (0.4V) reference */
+#if defined(FSL_FEATURE_VREF_HAS_LOW_REFERENCE) && FSL_FEATURE_VREF_HAS_LOW_REFERENCE
+#define VREF_SC_MODE_LV VREF_VREFH_SC_MODE_LV
+#define VREF_SC_REGEN VREF_VREFH_SC_REGEN
+#define VREF_SC_VREFEN VREF_VREFH_SC_VREFEN
+#define VREF_SC_ICOMPEN VREF_VREFH_SC_ICOMPEN
+#define VREF_SC_REGEN_MASK VREF_VREFH_SC_REGEN_MASK
+#define VREF_SC_VREFST_MASK VREF_VREFH_SC_VREFST_MASK
+#define VREF_SC_VREFEN_MASK VREF_VREFH_SC_VREFEN_MASK
+#define VREF_SC_MODE_LV_MASK VREF_VREFH_SC_MODE_LV_MASK
+#define VREF_SC_ICOMPEN_MASK VREF_VREFH_SC_ICOMPEN_MASK
+#define TRM VREFH_TRM
+#define VREF_TRM_TRIM VREF_VREFH_TRM_TRIM
+#define VREF_TRM_CHOPEN_MASK VREF_VREFH_TRM_CHOPEN_MASK
+#define VREF_TRM_TRIM_MASK VREF_VREFH_TRM_TRIM_MASK
+#define VREF_TRM_CHOPEN_SHIFT VREF_VREFH_TRM_CHOPEN_SHIFT
+#define VREF_TRM_TRIM_SHIFT VREF_VREFH_TRM_TRIM_SHIFT
+#define VREF_SC_MODE_LV_SHIFT VREF_VREFH_SC_MODE_LV_SHIFT
+#define VREF_SC_REGEN_SHIFT VREF_VREFH_SC_REGEN_SHIFT
+#define VREF_SC_VREFST_SHIFT VREF_VREFH_SC_VREFST_SHIFT
+#define VREF_SC_ICOMPEN_SHIFT VREF_VREFH_SC_ICOMPEN_SHIFT
+#endif /* FSL_FEATURE_VREF_HAS_LOW_REFERENCE */
+
+/*!
+ * @brief VREF modes.
+ */
+typedef enum _vref_buffer_mode
+{
+    kVREF_ModeBandgapOnly = 0U, /*!< Bandgap on only, for stabilization and startup */
+#if defined(FSL_FEATURE_VREF_MODE_LV_TYPE) && FSL_FEATURE_VREF_MODE_LV_TYPE
+    kVREF_ModeHighPowerBuffer = 1U, /*!< High-power buffer mode enabled */
+    kVREF_ModeLowPowerBuffer = 2U   /*!< Low-power buffer mode enabled */
+#else
+    kVREF_ModeTightRegulationBuffer = 2U /*!< Tight regulation buffer enabled */
+#endif /* FSL_FEATURE_VREF_MODE_LV_TYPE */
+} vref_buffer_mode_t;
+
+/*!
+ * @brief The description structure for the VREF module.
+ */
+typedef struct _vref_config
+{
+    vref_buffer_mode_t bufferMode; /*!< Buffer mode selection */
+#if defined(FSL_FEATURE_VREF_HAS_LOW_REFERENCE) && FSL_FEATURE_VREF_HAS_LOW_REFERENCE
+    bool enableLowRef;          /*!< Set VREFL (0.4 V) reference buffer enable or disable */
+    bool enableExternalVoltRef; /*!< Select external voltage reference or not (internal) */
+#endif                          /* FSL_FEATURE_VREF_HAS_LOW_REFERENCE */
+#if defined(FSL_FEATURE_VREF_HAS_TRM4) && FSL_FEATURE_VREF_HAS_TRM4
+    bool enable2V1VoltRef; /*!< Enable Internal Voltage Reference (2.1V) */
+#endif                     /* FSL_FEATURE_VREF_HAS_TRM4 */
+} vref_config_t;
+
+/******************************************************************************
+ * API
+ ******************************************************************************/
+
+#if defined(__cplusplus)
+extern "C" {
+#endif /* __cplusplus */
+
+/*!
+ * @name VREF functional operation
+ * @{
+ */
+
+/*!
+ * @brief Enables the clock gate and configures the VREF module according to the configuration structure.
+ *
+ * This function must be called before calling all other VREF driver functions,
+ * read/write registers, and configurations with user-defined settings.
+ * The example below shows how to set up  vref_config_t parameters and
+ * how to call the VREF_Init function by passing in these parameters.
+ * This is an example.
+ * @code
+ *   vref_config_t vrefConfig;
+ *   vrefConfig.bufferMode = kVREF_ModeHighPowerBuffer;
+ *   vrefConfig.enableExternalVoltRef = false;
+ *   vrefConfig.enableLowRef = false;
+ *   VREF_Init(VREF, &vrefConfig);
+ * @endcode
+ *
+ * @param base VREF peripheral address.
+ * @param config Pointer to the configuration structure.
+ */
+void VREF_Init(VREF_Type *base, const vref_config_t *config);
+
+/*!
+ * @brief Stops and disables the clock for the VREF module.
+ *
+ * This function should be called to shut down the module.
+ * This is an example.
+ * @code
+ *   vref_config_t vrefUserConfig;
+ *   VREF_Init(VREF);
+ *   VREF_GetDefaultConfig(&vrefUserConfig);
+ *   ...
+ *   VREF_Deinit(VREF);
+ * @endcode
+ *
+ * @param base VREF peripheral address.
+ */
+void VREF_Deinit(VREF_Type *base);
+
+/*!
+ * @brief Initializes the VREF configuration structure.
+ *
+ * This function initializes the VREF configuration structure to default values.
+ * This is an example.
+ * @code
+ *   vrefConfig->bufferMode = kVREF_ModeHighPowerBuffer;
+ *   vrefConfig->enableExternalVoltRef = false;
+ *   vrefConfig->enableLowRef = false;
+ * @endcode
+ *
+ * @param config Pointer to the initialization structure.
+ */
+void VREF_GetDefaultConfig(vref_config_t *config);
+
+/*!
+ * @brief Sets a TRIM value for the reference voltage.
+ *
+ * This function sets a TRIM value for the reference voltage.
+ * Note that the TRIM value maximum is 0x3F.
+ *
+ * @param base VREF peripheral address.
+ * @param trimValue Value of the trim register to set the output reference voltage (maximum 0x3F (6-bit)).
+ */
+void VREF_SetTrimVal(VREF_Type *base, uint8_t trimValue);
+
+/*!
+ * @brief Reads the value of the TRIM meaning output voltage.
+ *
+ * This function gets the TRIM value from the TRM register.
+ *
+ * @param base VREF peripheral address.
+ * @return Six-bit value of trim setting.
+ */
+static inline uint8_t VREF_GetTrimVal(VREF_Type *base)
+{
+    return (base->TRM & VREF_TRM_TRIM_MASK);
+}
+
+#if defined(FSL_FEATURE_VREF_HAS_TRM4) && FSL_FEATURE_VREF_HAS_TRM4
+/*!
+ * @brief Sets a TRIM value for the reference voltage (2V1).
+ *
+ * This function sets a TRIM value for the reference voltage (2V1).
+ * Note that the TRIM value maximum is 0x3F.
+ *
+ * @param base VREF peripheral address.
+ * @param trimValue Value of the trim register to set the output reference voltage (maximum 0x3F (6-bit)).
+ */
+void VREF_SetTrim2V1Val(VREF_Type *base, uint8_t trimValue);
+
+/*!
+ * @brief Reads the value of the TRIM meaning output voltage (2V1).
+ *
+ * This function gets the TRIM value from the VREF_TRM4 register.
+ *
+ * @param base VREF peripheral address.
+ * @return Six-bit value of trim setting.
+ */
+static inline uint8_t VREF_GetTrim2V1Val(VREF_Type *base)
+{
+    return (base->TRM4 & VREF_TRM4_TRIM2V1_MASK);
+}
+#endif /* FSL_FEATURE_VREF_HAS_TRM4 */
+
+#if defined(FSL_FEATURE_VREF_HAS_LOW_REFERENCE) && FSL_FEATURE_VREF_HAS_LOW_REFERENCE
+
+/*!
+ * @brief Sets the TRIM value for the low voltage reference.
+ *
+ * This function sets the TRIM value for low reference voltage.
+ * Note the following.
+ *      - The TRIM value maximum is 0x05U
+ *      - The values 111b and 110b are not valid/allowed.
+ *
+ * @param base VREF peripheral address.
+ * @param trimValue Value of the trim register to set output low reference voltage (maximum 0x05U (3-bit)).
+ */
+void VREF_SetLowReferenceTrimVal(VREF_Type *base, uint8_t trimValue);
+
+/*!
+ * @brief Reads the value of the TRIM meaning output voltage.
+ *
+ * This function gets the TRIM value from the VREFL_TRM register.
+ *
+ * @param base VREF peripheral address.
+ * @return Three-bit value of the trim setting.
+ */
+static inline uint8_t VREF_GetLowReferenceTrimVal(VREF_Type *base)
+{
+    return (base->VREFL_TRM & VREF_VREFL_TRM_VREFL_TRIM_MASK);
+}
+#endif /* FSL_FEATURE_VREF_HAS_LOW_REFERENCE */
+
+/*@}*/
+
+#if defined(__cplusplus)
+}
+#endif /* __cplusplus */
+
+/*! @}*/
+
+#endif /* _FSL_VREF_H_ */