diff --git a/include/power/regulator.h b/include/power/regulator.h
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+/*
+ *  Copyright (C) 2014-2015 Samsung Electronics
+ *  Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _INCLUDE_REGULATOR_H_
+#define _INCLUDE_REGULATOR_H_
+
+/**
+ * U-Boot Voltage/Current Regulator
+ * ================================
+ *
+ * The regulator API is based on a driver model, with the device tree support.
+ * And this header describes the functions and data types for the uclass id:
+ * 'UCLASS_REGULATOR' and the regulator driver API.
+ *
+ * The regulator uclass - is based on uclass platform data which is allocated,
+ * automatically for each regulator device on bind and 'dev->uclass_platdata'
+ * points to it. The data type is: 'struct dm_regulator_uclass_platdata'.
+ * The uclass file: 'drivers/power/regulator/regulator-uclass.c'
+ *
+ * The regulator device - is based on driver's model 'struct udevice'.
+ * The API can use regulator name in two meanings:
+ * - devname  - the regulator device's name: 'dev->name'
+ * - platname - the device's platdata's name. So in the code it looks like:
+ *              'uc_pdata = dev->uclass_platdata'; 'name = uc_pdata->name'.
+ *
+ * The regulator device driver - provide an implementation of uclass operations
+ * pointed by 'dev->driver->ops' as a struct of type 'struct dm_regulator_ops'.
+ *
+ * To proper bind the regulator device, the device tree node should provide
+ * regulator constraints, like in the example below:
+ *
+ * ldo1 {
+ *      regulator-name = "VDD_MMC_1.8V";     (mandatory for bind)
+ *      regulator-min-microvolt = <1000000>; (optional)
+ *      regulator-max-microvolt = <1000000>; (optional)
+ *      regulator-min-microamp = <1000>;     (optional)
+ *      regulator-max-microamp = <1000>;     (optional)
+ *      regulator-always-on;                 (optional)
+ *      regulator-boot-on;                   (optional)
+ * };
+ *
+ * Please take a notice, that for the proper operation at least name constraint
+ * is needed, e.g. for call the device_by_platname(...).
+ *
+ * Regulator bind:
+ * For each regulator device, the device_bind() should be called with passed
+ * device tree offset. This is required for this uclass's '.post_bind' method,
+ * which do the scan on the device node, for the 'regulator-name' constraint.
+ * If the parent is not a PMIC device, and the child is not bind by function:
+ * 'pmic_bind_childs()', then it's recommended to bind the device by call to
+ * dm_scan_fdt_node() - this is usually done automatically for bus devices,
+ * as a post bind method.
+ * Having the device's name constraint, we can call regulator_by_platname(),
+ * to find interesting regulator. Before return, the regulator is probed,
+ * and the rest of its constraints are put into the device's uclass platform
+ * data, by the uclass regulator '.pre_probe' method.
+ *
+ * For more info about PMIC bind, please refer to file: 'include/power/pmic.h'
+ *
+ * Note:
+ * Please do not use the device_bind_by_name() function, since it pass '-1' as
+ * device node offset - and the bind will fail on uclass .post_bind method,
+ * because of missing 'regulator-name' constraint.
+ *
+ *
+ * Fixed Voltage/Current Regulator
+ * ===============================
+ *
+ * When fixed voltage regulator is needed, then enable the config:
+ * - CONFIG_DM_REGULATOR_FIXED
+ *
+ * The driver file: 'drivers/power/regulator/fixed.c', provides basic support
+ * for control the GPIO, and return the device tree constraint values.
+ *
+ * To bind the fixed voltage regulator device, we usually use a 'simple-bus'
+ * node as a parent. And 'regulator-fixed' for the driver compatible. This is
+ * the same as in the kernel. The example node of fixed regulator:
+ *
+ * simple-bus {
+ *     compatible = "simple-bus";
+ *     #address-cells = <1>;
+ *     #size-cells = <0>;
+ *
+ *     blue_led {
+ *         compatible = "regulator-fixed";
+ *         regulator-name = "VDD_LED_3.3V";
+ *         regulator-min-microvolt = <3300000>;
+ *         regulator-max-microvolt = <3300000>;
+ *         gpio = <&gpc1 0 GPIO_ACTIVE_LOW>;
+ *     };
+ * };
+ *
+ * The fixed regulator devices also provide regulator uclass platform data. And
+ * devices bound from such node, can use the regulator drivers API.
+*/
+
+/* enum regulator_type - used for regulator_*() variant calls */
+enum regulator_type {
+	REGULATOR_TYPE_LDO = 0,
+	REGULATOR_TYPE_BUCK,
+	REGULATOR_TYPE_DVS,
+	REGULATOR_TYPE_FIXED,
+	REGULATOR_TYPE_OTHER,
+};
+
+/**
+ * struct dm_regulator_mode - this structure holds an information about
+ * each regulator operation mode. Probably in most cases - an array.
+ * This will be probably a driver-static data, since it is device-specific.
+ *
+ * @id             - a driver-specific mode id
+ * @register_value - a driver-specific value for its mode id
+ * @name           - the name of mode - used for regulator command
+ * Note:
+ * The field 'id', should be always a positive number, since the negative values
+ * are reserved for the errno numbers when returns the mode id.
+ */
+struct dm_regulator_mode {
+	int id; /* Set only as >= 0 (negative value is reserved for errno) */
+	int register_value;
+	const char *name;
+};
+
+/**
+ * struct dm_regulator_uclass_platdata - pointed by dev->uclass_platdata, and
+ * allocated on each regulator bind. This structure holds an information
+ * about each regulator's constraints and supported operation modes.
+ * There is no "step" voltage value - so driver should take care of this.
+ *
+ * @type       - one of 'enum regulator_type'
+ * @mode       - pointer to the regulator mode (array if more than one)
+ * @mode_count - number of '.mode' entries
+ * @min_uV*    - minimum voltage (micro Volts)
+ * @max_uV*    - maximum voltage (micro Volts)
+ * @min_uA*    - minimum amperage (micro Amps)
+ * @max_uA*    - maximum amperage (micro Amps)
+ * @always_on* - bool type, true or false
+ * @boot_on*   - bool type, true or false
+ * @name**     - fdt regulator name - should be taken from the device tree
+ *
+ * Note:
+ * *  - set automatically on device probe by the uclass's '.pre_probe' method.
+ * ** - set automatically on device bind by the uclass's '.post_bind' method.
+ * The constraints: type, mode, mode_count, can be set by device driver, e.g.
+ * by the driver '.probe' method.
+ */
+struct dm_regulator_uclass_platdata {
+	enum regulator_type type;
+	struct dm_regulator_mode *mode;
+	int mode_count;
+	int min_uV;
+	int max_uV;
+	int min_uA;
+	int max_uA;
+	bool always_on;
+	bool boot_on;
+	const char *name;
+};
+
+/* Regulator device operations */
+struct dm_regulator_ops {
+	/**
+	 * The regulator output value function calls operates on a micro Volts.
+	 *
+	 * get/set_value - get/set output value of the given output number
+	 * @dev          - regulator device
+	 * Sets:
+	 * @uV           - set the output value [micro Volts]
+	 * Returns: output value [uV] on success or negative errno if fail.
+	 */
+	int (*get_value)(struct udevice *dev);
+	int (*set_value)(struct udevice *dev, int uV);
+
+	/**
+	 * The regulator output current function calls operates on a micro Amps.
+	 *
+	 * get/set_current - get/set output current of the given output number
+	 * @dev            - regulator device
+	 * Sets:
+	 * @uA           - set the output current [micro Amps]
+	 * Returns: output value [uA] on success or negative errno if fail.
+	 */
+	int (*get_current)(struct udevice *dev);
+	int (*set_current)(struct udevice *dev, int uA);
+
+	/**
+	 * The most basic feature of the regulator output is its enable state.
+	 *
+	 * get/set_enable - get/set enable state of the given output number
+	 * @dev           - regulator device
+	 * Sets:
+	 * @enable         - set true - enable or false - disable
+	 * Returns: true/false for get; or 0 / -errno for set.
+	 */
+	bool (*get_enable)(struct udevice *dev);
+	int (*set_enable)(struct udevice *dev, bool enable);
+
+	/**
+	 * The 'get/set_mode()' function calls should operate on a driver
+	 * specific mode definitions, which should be found in:
+	 * field 'mode' of struct mode_desc.
+	 *
+	 * get/set_mode - get/set operation mode of the given output number
+	 * @dev         - regulator device
+	 * Sets
+	 * @mode_id     - set output mode id (struct dm_regulator_mode->id)
+	 * Returns: id/0 for get/set on success or negative errno if fail.
+	 * Note:
+	 * The field 'id' of struct type 'dm_regulator_mode', should be always
+	 * positive number, since the negative is reserved for the error.
+	 */
+	int (*get_mode)(struct udevice *dev);
+	int (*set_mode)(struct udevice *dev, int mode_id);
+};
+
+/**
+ * regulator_mode: returns a pointer to the array of regulator mode info
+ *
+ * @dev        - pointer to the regulator device
+ * @modep      - pointer to the returned mode info array
+ * Returns     - count of modep entries on success or negative errno if fail.
+ */
+int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep);
+
+/**
+ * regulator_get_value: get microvoltage voltage value of a given regulator
+ *
+ * @dev    - pointer to the regulator device
+ * Returns - positive output value [uV] on success or negative errno if fail.
+ */
+int regulator_get_value(struct udevice *dev);
+
+/**
+ * regulator_set_value: set the microvoltage value of a given regulator.
+ *
+ * @dev    - pointer to the regulator device
+ * @uV     - the output value to set [micro Volts]
+ * Returns - 0 on success or -errno val if fails
+ */
+int regulator_set_value(struct udevice *dev, int uV);
+
+/**
+ * regulator_get_current: get microampere value of a given regulator
+ *
+ * @dev    - pointer to the regulator device
+ * Returns - positive output current [uA] on success or negative errno if fail.
+ */
+int regulator_get_current(struct udevice *dev);
+
+/**
+ * regulator_set_current: set the microampere value of a given regulator.
+ *
+ * @dev    - pointer to the regulator device
+ * @uA     - set the output current [micro Amps]
+ * Returns - 0 on success or -errno val if fails
+ */
+int regulator_set_current(struct udevice *dev, int uA);
+
+/**
+ * regulator_get_enable: get regulator device enable state.
+ *
+ * @dev    - pointer to the regulator device
+ * Returns - true/false of enable state
+ */
+bool regulator_get_enable(struct udevice *dev);
+
+/**
+ * regulator_set_enable: set regulator enable state
+ *
+ * @dev    - pointer to the regulator device
+ * @enable - set true or false
+ * Returns - 0 on success or -errno val if fails
+ */
+int regulator_set_enable(struct udevice *dev, bool enable);
+
+/**
+ * regulator_get_mode: get mode of a given device regulator
+ *
+ * @dev    - pointer to the regulator device
+ * Returns - positive  mode number on success or -errno val if fails
+ * Note:
+ * The regulator driver should return one of defined, mode number rather, than
+ * the raw register value. The struct type 'mode_desc' provides a field 'mode'
+ * for this purpose and register_value for a raw register value.
+ */
+int regulator_get_mode(struct udevice *dev);
+
+/**
+ * regulator_set_mode: set given regulator mode
+ *
+ * @dev    - pointer to the regulator device
+ * @mode   - mode type (field 'mode' of struct mode_desc)
+ * Returns - 0 on success or -errno value if fails
+ * Note:
+ * The regulator driver should take one of defined, mode number rather
+ * than a raw register value. The struct type 'regulator_mode_desc' has
+ * a mode field for this purpose and register_value for a raw register value.
+ */
+int regulator_set_mode(struct udevice *dev, int mode);
+
+/**
+ * regulator_by_platname_autoset_and_enable: setup the regulator given by
+ * its uclass's platform data '.name'. The setup depends on constraints found
+ * in device's uclass's platform data (struct dm_regulator_uclass_platdata):
+ * - Voltage value - will set - if '.min_uV' and '.max_uV' values are equal
+ * - Current limit - will set - if '.min_uA' and '.max_uA' values are equal
+ * - Enable - will set - if '.always_on' or '.boot_on' are set to true
+ *
+ * The function returns on first encountered error.
+ *
+ * @platname - expected string for dm_regulator_uclass_platdata .name field
+ * @devp      - returned pointer to the regulator device - if non-NULL passed
+ * @verbose   - (true/false) print regulator setup info, or be quiet
+ * Returns: 0 on success or negative value of errno.
+ *
+ * The returned 'regulator' device can be used with:
+ * - regulator_get/set_*
+ * For shorter call name, the below macro regulator_autoset() can be used.
+ */
+int regulator_by_platname_autoset_and_enable(const char *platname,
+					     struct udevice **devp,
+					     bool verbose);
+
+#define regulator_autoset(platname, devp, verbose) \
+	regulator_by_platname_autoset_and_enable(platname, devp, verbose)
+
+/**
+ * regulator_by_platname_list_autoset_and_enable: setup the regulators given by
+ * list of its uclass's platform data '.name'. The setup depends on constraints
+ * found in device's uclass's platform data. The function loops with calls to:
+ * regulator_by_platname_autoset_and_enable() for each name of list.
+ *
+ * @list_platname - an array of expected strings for .name field of each
+ *                  regulator's uclass platdata
+ * @list_entries  - number of regulator's name list entries
+ * @list_devp     - an array of returned pointers to the successfully setup
+ *                  regulator devices if non-NULL passed
+ * @verbose       - (true/false) print each regulator setup info, or be quiet
+ * Returns: 0 on successfully setup of all list entries or 1 otwerwise.
+ *
+ * The returned 'regulator' devices can be used with:
+ * - regulator_get/set_*
+ * For shorter call name, the below macro regulator_list_autoset() can be used.
+ */
+int regulator_by_platname_list_autoset_and_enable(const char *list_platname[],
+						  int list_entries,
+						  struct udevice *list_devp[],
+						  bool verbose);
+
+#define regulator_list_autoset(namelist, entries, devlist, verbose)      \
+	regulator_by_platname_list_autoset_and_enable(namelist, entries, \
+						      devlist, verbose)
+
+/**
+ * regulator_by_devname: returns the pointer to the pmic regulator device.
+ *                       Search by name, found in regulator device's name.
+ *
+ * @devname - expected string for 'dev->name' of regulator device
+ * @devp     - returned pointer to the regulator device
+ * Returns: 0 on success or negative value of errno.
+ *
+ * The returned 'regulator' device can be used with:
+ * - regulator_get/set_*
+ */
+int regulator_by_devname(const char *devname, struct udevice **devp);
+
+/**
+ * regulator_by_platname: returns the pointer to the pmic regulator device.
+ *                        Search by name, found in regulator uclass platdata.
+ *
+ * @platname - expected string for dm_regulator_uclass_platdata .name field
+ * @devp     - returned pointer to the regulator device
+ * Returns: 0 on success or negative value of errno.
+ *
+ * The returned 'regulator' device can be used with:
+ * - regulator_get/set_*
+ */
+int regulator_by_platname(const char *platname, struct udevice **devp);
+
+#endif /* _INCLUDE_REGULATOR_H_ */