include/clk.h - u-boot-mtk - Git at Google

 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (c) 2015 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>
  * Copyright (c) 2016, NVIDIA CORPORATION.
  */

 #ifndef _CLK_H_
 #define _CLK_H_

 #include <dm/ofnode.h>
 #include <linux/errno.h>
 #include <linux/types.h>

 /**
  * A clock is a hardware signal that oscillates autonomously at a specific
  * frequency and duty cycle. Most hardware modules require one or more clock
  * signal to drive their operation. Clock signals are typically generated
  * externally to the HW module consuming them, by an entity this API calls a
  * clock provider. This API provides a standard means for drivers to enable and
  * disable clocks, and to set the rate at which they oscillate.
  *
  * A driver that implements UCLASS_CLK is a clock provider. A provider will
  * often implement multiple separate clocks, since the hardware it manages
  * often has this capability. clk-uclass.h describes the interface which
  * clock providers must implement.
  *
  * Clock consumers/clients are the HW modules driven by the clock signals. This
  * header file describes the API used by drivers for those HW modules.
  */

 struct udevice;

 /**
  * struct clk - A handle to (allowing control of) a single clock.
  *
  * Clients provide storage for clock handles. The content of the structure is
  * managed solely by the clock API and clock drivers. A clock struct is
  * initialized by "get"ing the clock struct. The clock struct is passed to all
  * other clock APIs to identify which clock signal to operate upon.
  *
  * @dev: The device which implements the clock signal.
  * @rate: The clock rate (in HZ).
  * @flags: Flags used across common clock structure (e.g. CLK_)
  *         Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
  *         in struct's for those devices (e.g. struct clk_mux).
  * @id: The clock signal ID within the provider.
  * @data: An optional data field for scenarios where a single integer ID is not
  *	  sufficient. If used, it can be populated through an .of_xlate op and
  *	  processed during the various clock ops.
  *
  * Should additional information to identify and configure any clock signal
  * for any provider be required in the future, the struct could be expanded to
  * either (a) add more fields to allow clock providers to store additional
  * information, or (b) replace the id field with an opaque pointer, which the
  * provider would dynamically allocated during its .of_xlate op, and process
  * during is .request op. This may require the addition of an extra op to clean
  * up the allocation.
  */
 struct clk {
 	struct udevice *dev;
 	long long rate;	/* in HZ */
 	u32 flags;
 	int enable_count;
 	/*
 	 * Written by of_xlate. In the future, we might add more fields here.
 	 */
 	unsigned long id;
 	unsigned long data;
 };

 /**
  * struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
  *
  * Clients provide storage for the clock bulk. The content of the structure is
  * managed solely by the clock API. A clock bulk struct is
  * initialized by "get"ing the clock bulk struct.
  * The clock bulk struct is passed to all other bulk clock APIs to apply
  * the API to all the clock in the bulk struct.
  *
  * @clks: An array of clock handles.
  * @count: The number of clock handles in the clks array.
  */
 struct clk_bulk {
 	struct clk *clks;
 	unsigned int count;
 };

 #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
 struct phandle_1_arg;
 int clk_get_by_index_platdata(struct udevice *dev, int index,
 			      struct phandle_1_arg *cells, struct clk *clk);

 /**
  * clock_get_by_index - Get/request a clock by integer index.
  *
  * This looks up and requests a clock. The index is relative to the client
  * device; each device is assumed to have n clocks associated with it somehow,
  * and this function finds and requests one of them. The mapping of client
  * device clock indices to provider clocks may be via device-tree properties,
  * board-provided mapping tables, or some other mechanism.
  *
  * @dev:	The client device.
  * @index:	The index of the clock to request, within the client's list of
  *		clocks.
  * @clock	A pointer to a clock struct to initialize.
  * @return 0 if OK, or a negative error code.
  */
 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk);

 /**
  * clock_get_by_index_nodev - Get/request a clock by integer index
  * without a device.
  *
  * This is a version of clk_get_by_index() that does not use a device.
  *
  * @node:	The client ofnode.
  * @index:	The index of the clock to request, within the client's list of
  *		clocks.
  * @clock	A pointer to a clock struct to initialize.
  * @return 0 if OK, or a negative error code.
  */
 int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk);

 /**
  * clock_get_bulk - Get/request all clocks of a device.
  *
  * This looks up and requests all clocks of the client device; each device is
  * assumed to have n clocks associated with it somehow, and this function finds
  * and requests all of them in a separate structure. The mapping of client
  * device clock indices to provider clocks may be via device-tree properties,
  * board-provided mapping tables, or some other mechanism.
  *
  * @dev:	The client device.
  * @bulk	A pointer to a clock bulk struct to initialize.
  * @return 0 if OK, or a negative error code.
  */
 int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);

 /**
  * clock_get_by_name - Get/request a clock by name.
  *
  * This looks up and requests a clock. The name is relative to the client
  * device; each device is assumed to have n clocks associated with it somehow,
  * and this function finds and requests one of them. The mapping of client
  * device clock names to provider clocks may be via device-tree properties,
  * board-provided mapping tables, or some other mechanism.
  *
  * @dev:	The client device.
  * @name:	The name of the clock to request, within the client's list of
  *		clocks.
  * @clock:	A pointer to a clock struct to initialize.
  * @return 0 if OK, or a negative error code.
  */
 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);

 /**
  * clk_release_all() - Disable (turn off)/Free an array of previously
  * requested clocks.
  *
  * For each clock contained in the clock array, this function will check if
  * clock has been previously requested and then will disable and free it.
  *
  * @clk:	A clock struct array that was previously successfully
  *		requested by clk_request/get_by_*().
  * @count	Number of clock contained in the array
  * @return zero on success, or -ve error code.
  */
 int clk_release_all(struct clk *clk, int count);

 #else
 static inline int clk_get_by_index(struct udevice *dev, int index,
 				   struct clk *clk)
 {
 	return -ENOSYS;
 }

 static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
 {
 	return -ENOSYS;
 }

 static inline int clk_get_by_name(struct udevice *dev, const char *name,
 			   struct clk *clk)
 {
 	return -ENOSYS;
 }

 static inline int clk_release_all(struct clk *clk, int count)
 {
 	return -ENOSYS;
 }
 #endif

 #if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
 	CONFIG_IS_ENABLED(CLK)
 /**
  * clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
  *                    properties to configure clocks
  *
  * @dev:        A device to process (the ofnode associated with this device
  *              will be processed).
  */
 int clk_set_defaults(struct udevice *dev);
 #else
 static inline int clk_set_defaults(struct udevice *dev)
 {
 	return 0;
 }
 #endif

 /**
  * clk_release_bulk() - Disable (turn off)/Free an array of previously
  * requested clocks in a clock bulk struct.
  *
  * For each clock contained in the clock bulk struct, this function will check
  * if clock has been previously requested and then will disable and free it.
  *
  * @clk:	A clock bulk struct that was previously successfully
  *		requested by clk_get_bulk().
  * @return zero on success, or -ve error code.
  */
 static inline int clk_release_bulk(struct clk_bulk *bulk)
 {
 	return clk_release_all(bulk->clks, bulk->count);
 }

 /**
  * clk_request - Request a clock by provider-specific ID.
  *
  * This requests a clock using a provider-specific ID. Generally, this function
  * should not be used, since clk_get_by_index/name() provide an interface that
  * better separates clients from intimate knowledge of clock providers.
  * However, this function may be useful in core SoC-specific code.
  *
  * @dev:	The clock provider device.
  * @clock:	A pointer to a clock struct to initialize. The caller must
  *		have already initialized any field in this struct which the
  *		clock provider uses to identify the clock.
  * @return 0 if OK, or a negative error code.
  */
 int clk_request(struct udevice *dev, struct clk *clk);

 /**
  * clock_free - Free a previously requested clock.
  *
  * @clock:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return 0 if OK, or a negative error code.
  */
 int clk_free(struct clk *clk);

 /**
  * clk_get_rate() - Get current clock rate.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return clock rate in Hz, or -ve error code.
  */
 ulong clk_get_rate(struct clk *clk);

 /**
  * clk_get_parent() - Get current clock's parent.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return pointer to parent's struct clk, or error code passed as pointer
  */
 struct clk *clk_get_parent(struct clk *clk);

 /**
  * clk_get_parent_rate() - Get parent of current clock rate.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return clock rate in Hz, or -ve error code.
  */
 long long clk_get_parent_rate(struct clk *clk);

 /**
  * clk_set_rate() - Set current clock rate.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @rate:	New clock rate in Hz.
  * @return new rate, or -ve error code.
  */
 ulong clk_set_rate(struct clk *clk, ulong rate);

 /**
  * clk_set_parent() - Set current clock parent.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @parent:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return new rate, or -ve error code.
  */
 int clk_set_parent(struct clk *clk, struct clk *parent);

 /**
  * clk_enable() - Enable (turn on) a clock.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return zero on success, or -ve error code.
  */
 int clk_enable(struct clk *clk);

 static inline int clk_prepare_enable(struct clk *clk)
 {
 	if (!clk)
 		return 0;
 	return clk_enable(clk);
 }

 /**
  * clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
  *
  * @bulk:	A clock bulk struct that was previously successfully requested
  *		by clk_get_bulk().
  * @return zero on success, or -ve error code.
  */
 int clk_enable_bulk(struct clk_bulk *bulk);

 /**
  * clk_disable() - Disable (turn off) a clock.
  *
  * @clk:	A clock struct that was previously successfully requested by
  *		clk_request/get_by_*().
  * @return zero on success, or -ve error code.
  */
 int clk_disable(struct clk *clk);

 static inline void clk_disable_unprepare(struct clk *clk)
 {
 	if (clk)
 		clk_disable(clk);
 }

 /**
  * clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
  *
  * @bulk:	A clock bulk struct that was previously successfully requested
  *		by clk_get_bulk().
  * @return zero on success, or -ve error code.
  */
 int clk_disable_bulk(struct clk_bulk *bulk);

 /**
  * clk_is_match - check if two clk's point to the same hardware clock
  * @p: clk compared against q
  * @q: clk compared against p
  *
  * Returns true if the two struct clk pointers both point to the same hardware
  * clock node.
  *
  * Returns false otherwise. Note that two NULL clks are treated as matching.
  */
 bool clk_is_match(const struct clk *p, const struct clk *q);

 int soc_clk_dump(void);

 /**
  * clk_valid() - check if clk is valid
  *
  * @clk:	the clock to check
  * @return true if valid, or false
  */
 static inline bool clk_valid(struct clk *clk)
 {
 	return !!clk->dev;
 }

 /**
  * clk_get_by_id() - Get the clock by its ID
  *
  * @id:	The clock ID to search for
  *
  * @clkp:	A pointer to clock struct that has been found among added clocks
  *              to UCLASS_CLK
  * @return zero on success, or -ENOENT on error
  */
 int clk_get_by_id(ulong id, struct clk **clkp);

 /**
  * clk_dev_binded() - Check whether the clk has a device binded
  *
  * @clk		A pointer to the clk
  *
  * @return true on binded, or false on no
  */
 bool clk_dev_binded(struct clk *clk);
 #endif
	/* SPDX-License-Identifier: GPL-2.0+ */
	/*
	* Copyright (c) 2015 Google, Inc
	* Written by Simon Glass <sjg@chromium.org>
	* Copyright (c) 2016, NVIDIA CORPORATION.
	*/

	#ifndef _CLK_H_
	#define _CLK_H_

	#include <dm/ofnode.h>
	#include <linux/errno.h>
	#include <linux/types.h>

	/**
	* A clock is a hardware signal that oscillates autonomously at a specific
	* frequency and duty cycle. Most hardware modules require one or more clock
	* signal to drive their operation. Clock signals are typically generated
	* externally to the HW module consuming them, by an entity this API calls a
	* clock provider. This API provides a standard means for drivers to enable and
	* disable clocks, and to set the rate at which they oscillate.
	*
	* A driver that implements UCLASS_CLK is a clock provider. A provider will
	* often implement multiple separate clocks, since the hardware it manages
	* often has this capability. clk-uclass.h describes the interface which
	* clock providers must implement.
	*
	* Clock consumers/clients are the HW modules driven by the clock signals. This
	* header file describes the API used by drivers for those HW modules.
	*/

	struct udevice;

	/**
	* struct clk - A handle to (allowing control of) a single clock.
	*
	* Clients provide storage for clock handles. The content of the structure is
	* managed solely by the clock API and clock drivers. A clock struct is
	* initialized by "get"ing the clock struct. The clock struct is passed to all
	* other clock APIs to identify which clock signal to operate upon.
	*
	* @dev: The device which implements the clock signal.
	* @rate: The clock rate (in HZ).
	* @flags: Flags used across common clock structure (e.g. CLK_)
	* Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
	* in struct's for those devices (e.g. struct clk_mux).
	* @id: The clock signal ID within the provider.
	* @data: An optional data field for scenarios where a single integer ID is not
	* sufficient. If used, it can be populated through an .of_xlate op and
	* processed during the various clock ops.
	*
	* Should additional information to identify and configure any clock signal
	* for any provider be required in the future, the struct could be expanded to
	* either (a) add more fields to allow clock providers to store additional
	* information, or (b) replace the id field with an opaque pointer, which the
	* provider would dynamically allocated during its .of_xlate op, and process
	* during is .request op. This may require the addition of an extra op to clean
	* up the allocation.
	*/
	struct clk {
	struct udevice *dev;
	long long rate; /* in HZ */
	u32 flags;
	int enable_count;
	/*
	* Written by of_xlate. In the future, we might add more fields here.
	*/
	unsigned long id;
	unsigned long data;
	};

	/**
	* struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
	*
	* Clients provide storage for the clock bulk. The content of the structure is
	* managed solely by the clock API. A clock bulk struct is
	* initialized by "get"ing the clock bulk struct.
	* The clock bulk struct is passed to all other bulk clock APIs to apply
	* the API to all the clock in the bulk struct.
	*
	* @clks: An array of clock handles.
	* @count: The number of clock handles in the clks array.
	*/
	struct clk_bulk {
	struct clk *clks;
	unsigned int count;
	};

	#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
	struct phandle_1_arg;
	int clk_get_by_index_platdata(struct udevice *dev, int index,
	struct phandle_1_arg cells, struct clk clk);

	/**
	* clock_get_by_index - Get/request a clock by integer index.
	*
	* This looks up and requests a clock. The index is relative to the client
	* device; each device is assumed to have n clocks associated with it somehow,
	* and this function finds and requests one of them. The mapping of client
	* device clock indices to provider clocks may be via device-tree properties,
	* board-provided mapping tables, or some other mechanism.
	*
	* @dev: The client device.
	* @index: The index of the clock to request, within the client's list of
	* clocks.
	* @clock A pointer to a clock struct to initialize.
	* @return 0 if OK, or a negative error code.
	*/
	int clk_get_by_index(struct udevice dev, int index, struct clk clk);

	/**
	* clock_get_by_index_nodev - Get/request a clock by integer index
	* without a device.
	*
	* This is a version of clk_get_by_index() that does not use a device.
	*
	* @node: The client ofnode.
	* @index: The index of the clock to request, within the client's list of
	* clocks.
	* @clock A pointer to a clock struct to initialize.
	* @return 0 if OK, or a negative error code.
	*/
	int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk);

	/**
	* clock_get_bulk - Get/request all clocks of a device.
	*
	* This looks up and requests all clocks of the client device; each device is
	* assumed to have n clocks associated with it somehow, and this function finds
	* and requests all of them in a separate structure. The mapping of client
	* device clock indices to provider clocks may be via device-tree properties,
	* board-provided mapping tables, or some other mechanism.
	*
	* @dev: The client device.
	* @bulk A pointer to a clock bulk struct to initialize.
	* @return 0 if OK, or a negative error code.
	*/
	int clk_get_bulk(struct udevice dev, struct clk_bulk bulk);

	/**
	* clock_get_by_name - Get/request a clock by name.
	*
	* This looks up and requests a clock. The name is relative to the client
	* device; each device is assumed to have n clocks associated with it somehow,
	* and this function finds and requests one of them. The mapping of client
	* device clock names to provider clocks may be via device-tree properties,
	* board-provided mapping tables, or some other mechanism.
	*
	* @dev: The client device.
	* @name: The name of the clock to request, within the client's list of
	* clocks.
	* @clock: A pointer to a clock struct to initialize.
	* @return 0 if OK, or a negative error code.
	*/
	int clk_get_by_name(struct udevice dev, const char name, struct clk *clk);

	/**
	* clk_release_all() - Disable (turn off)/Free an array of previously
	* requested clocks.
	*
	* For each clock contained in the clock array, this function will check if
	* clock has been previously requested and then will disable and free it.
	*
	* @clk: A clock struct array that was previously successfully
	* requested by clk_request/get_by_*().
	* @count Number of clock contained in the array
	* @return zero on success, or -ve error code.
	*/
	int clk_release_all(struct clk *clk, int count);

	#else
	static inline int clk_get_by_index(struct udevice *dev, int index,
	struct clk *clk)
	{
	return -ENOSYS;
	}

	static inline int clk_get_bulk(struct udevice dev, struct clk_bulk bulk)
	{
	return -ENOSYS;
	}

	static inline int clk_get_by_name(struct udevice dev, const char name,
	struct clk *clk)
	{
	return -ENOSYS;
	}

	static inline int clk_release_all(struct clk *clk, int count)
	{
	return -ENOSYS;
	}
	#endif

	#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
	CONFIG_IS_ENABLED(CLK)
	/**
	* clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
	* properties to configure clocks
	*
	* @dev: A device to process (the ofnode associated with this device
	* will be processed).
	*/
	int clk_set_defaults(struct udevice *dev);
	#else
	static inline int clk_set_defaults(struct udevice *dev)
	{
	return 0;
	}
	#endif

	/**
	* clk_release_bulk() - Disable (turn off)/Free an array of previously
	* requested clocks in a clock bulk struct.
	*
	* For each clock contained in the clock bulk struct, this function will check
	* if clock has been previously requested and then will disable and free it.
	*
	* @clk: A clock bulk struct that was previously successfully
	* requested by clk_get_bulk().
	* @return zero on success, or -ve error code.
	*/
	static inline int clk_release_bulk(struct clk_bulk *bulk)
	{
	return clk_release_all(bulk->clks, bulk->count);
	}

	/**
	* clk_request - Request a clock by provider-specific ID.
	*
	* This requests a clock using a provider-specific ID. Generally, this function
	* should not be used, since clk_get_by_index/name() provide an interface that
	* better separates clients from intimate knowledge of clock providers.
	* However, this function may be useful in core SoC-specific code.
	*
	* @dev: The clock provider device.
	* @clock: A pointer to a clock struct to initialize. The caller must
	* have already initialized any field in this struct which the
	* clock provider uses to identify the clock.
	* @return 0 if OK, or a negative error code.
	*/
	int clk_request(struct udevice dev, struct clk clk);

	/**
	* clock_free - Free a previously requested clock.
	*
	* @clock: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return 0 if OK, or a negative error code.
	*/
	int clk_free(struct clk *clk);

	/**
	* clk_get_rate() - Get current clock rate.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return clock rate in Hz, or -ve error code.
	*/
	ulong clk_get_rate(struct clk *clk);

	/**
	* clk_get_parent() - Get current clock's parent.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return pointer to parent's struct clk, or error code passed as pointer
	*/
	struct clk clk_get_parent(struct clk clk);

	/**
	* clk_get_parent_rate() - Get parent of current clock rate.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return clock rate in Hz, or -ve error code.
	*/
	long long clk_get_parent_rate(struct clk *clk);

	/**
	* clk_set_rate() - Set current clock rate.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @rate: New clock rate in Hz.
	* @return new rate, or -ve error code.
	*/
	ulong clk_set_rate(struct clk *clk, ulong rate);

	/**
	* clk_set_parent() - Set current clock parent.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @parent: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return new rate, or -ve error code.
	*/
	int clk_set_parent(struct clk clk, struct clk parent);

	/**
	* clk_enable() - Enable (turn on) a clock.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return zero on success, or -ve error code.
	*/
	int clk_enable(struct clk *clk);

	static inline int clk_prepare_enable(struct clk *clk)
	{
	if (!clk)
	return 0;
	return clk_enable(clk);
	}

	/**
	* clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
	*
	* @bulk: A clock bulk struct that was previously successfully requested
	* by clk_get_bulk().
	* @return zero on success, or -ve error code.
	*/
	int clk_enable_bulk(struct clk_bulk *bulk);

	/**
	* clk_disable() - Disable (turn off) a clock.
	*
	* @clk: A clock struct that was previously successfully requested by
	* clk_request/get_by_*().
	* @return zero on success, or -ve error code.
	*/
	int clk_disable(struct clk *clk);

	static inline void clk_disable_unprepare(struct clk *clk)
	{
	if (clk)
	clk_disable(clk);
	}

	/**
	* clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
	*
	* @bulk: A clock bulk struct that was previously successfully requested
	* by clk_get_bulk().
	* @return zero on success, or -ve error code.
	*/
	int clk_disable_bulk(struct clk_bulk *bulk);

	/**
	* clk_is_match - check if two clk's point to the same hardware clock
	* @p: clk compared against q
	* @q: clk compared against p
	*
	* Returns true if the two struct clk pointers both point to the same hardware
	* clock node.
	*
	* Returns false otherwise. Note that two NULL clks are treated as matching.
	*/
	bool clk_is_match(const struct clk p, const struct clk q);

	int soc_clk_dump(void);

	/**
	* clk_valid() - check if clk is valid
	*
	* @clk: the clock to check
	* @return true if valid, or false
	*/
	static inline bool clk_valid(struct clk *clk)
	{
	return !!clk->dev;
	}

	/**
	* clk_get_by_id() - Get the clock by its ID
	*
	* @id: The clock ID to search for
	*
	* @clkp: A pointer to clock struct that has been found among added clocks
	* to UCLASS_CLK
	* @return zero on success, or -ENOENT on error
	*/
	int clk_get_by_id(ulong id, struct clk **clkp);

	/**
	* clk_dev_binded() - Check whether the clk has a device binded
	*
	* @clk A pointer to the clk
	*
	* @return true on binded, or false on no
	*/
	bool clk_dev_binded(struct clk *clk);
	#endif