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diff --git a/drivers/fsl_vref.h b/drivers/fsl_vref.h
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--- a/drivers/fsl_vref.h
+++ /dev/null
@@ -1,256 +0,0 @@
-/*
- * 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_ */