[linux.git] / drivers / clk / clkdev.c

/*
 * drivers/clk/clkdev.c
 *
 *  Copyright (C) 2008 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Helper for the clk API to assist looking up a struct clk.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/of.h>

#include "clk.h"

static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)

/**
 * of_clk_get_by_clkspec() - Lookup a clock form a clock provider
 * @clkspec: pointer to a clock specifier data structure
 *
 * This function looks up a struct clk from the registered list of clock
 * providers, an input is a clock specifier data structure as returned
 * from the of_parse_phandle_with_args() function call.
 */
struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec)
{
	struct clk *clk;

	if (!clkspec)
		return ERR_PTR(-EINVAL);

	of_clk_lock();
	clk = __of_clk_get_from_provider(clkspec);

	if (!IS_ERR(clk) && !__clk_get(clk))
		clk = ERR_PTR(-ENOENT);

	of_clk_unlock();
	return clk;
}

static struct clk *__of_clk_get(struct device_node *np, int index)
{
	struct of_phandle_args clkspec;
	struct clk *clk;
	int rc;

	if (index < 0)
		return ERR_PTR(-EINVAL);

	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
					&clkspec);
	if (rc)
		return ERR_PTR(rc);

	clk = of_clk_get_by_clkspec(&clkspec);
	of_node_put(clkspec.np);

	return clk;
}

struct clk *of_clk_get(struct device_node *np, int index)
{
	struct clk *clk = __of_clk_get(np, index);

	if (!IS_ERR(clk))
		clk = __clk_create_clk(__clk_get_hw(clk), np->full_name, NULL);

	return clk;
}
EXPORT_SYMBOL(of_clk_get);

static struct clk *__of_clk_get_by_name(struct device_node *np,
					const char *dev_id,
					const char *name)
{
	struct clk *clk = ERR_PTR(-ENOENT);

	/* Walk up the tree of devices looking for a clock that matches */
	while (np) {
		int index = 0;

		/*
		 * For named clocks, first look up the name in the
		 * "clock-names" property.  If it cannot be found, then
		 * index will be an error code, and of_clk_get() will fail.
		 */
		if (name)
			index = of_property_match_string(np, "clock-names", name);
		clk = __of_clk_get(np, index);
		if (!IS_ERR(clk)) {
			clk = __clk_create_clk(__clk_get_hw(clk), dev_id, name);
			break;
		}
		else if (name && index >= 0) {
			if (PTR_ERR(clk) != -EPROBE_DEFER)
				pr_err("ERROR: could not get clock %s:%s(%i)\n",
					np->full_name, name ? name : "", index);
			return clk;
		}

		/*
		 * No matching clock found on this node.  If the parent node
		 * has a "clock-ranges" property, then we can try one of its
		 * clocks.
		 */
		np = np->parent;
		if (np && !of_get_property(np, "clock-ranges", NULL))
			break;
	}

	return clk;
}

/**
 * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
 * @np: pointer to clock consumer node
 * @name: name of consumer's clock input, or NULL for the first clock reference
 *
 * This function parses the clocks and clock-names properties,
 * and uses them to look up the struct clk from the registered list of clock
 * providers.
 */
struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
{
	if (!np)
		return ERR_PTR(-ENOENT);

	return __of_clk_get_by_name(np, np->full_name, name);
}
EXPORT_SYMBOL(of_clk_get_by_name);

#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */

static struct clk *__of_clk_get_by_name(struct device_node *np,
					const char *dev_id,
					const char *name)
{
	return ERR_PTR(-ENOENT);
}
#endif

/*
 * Find the correct struct clk for the device and connection ID.
 * We do slightly fuzzy matching here:
 *  An entry with a NULL ID is assumed to be a wildcard.
 *  If an entry has a device ID, it must match
 *  If an entry has a connection ID, it must match
 * Then we take the most specific entry - with the following
 * order of precedence: dev+con > dev only > con only.
 */
static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
{
	struct clk_lookup *p, *cl = NULL;
	int match, best_found = 0, best_possible = 0;

	if (dev_id)
		best_possible += 2;
	if (con_id)
		best_possible += 1;

	list_for_each_entry(p, &clocks, node) {
		match = 0;
		if (p->dev_id) {
			if (!dev_id || strcmp(p->dev_id, dev_id))
				continue;
			match += 2;
		}
		if (p->con_id) {
			if (!con_id || strcmp(p->con_id, con_id))
				continue;
			match += 1;
		}

		if (match > best_found) {
			cl = p;
			if (match != best_possible)
				best_found = match;
			else
				break;
		}
	}
	return cl;
}

struct clk *clk_get_sys(const char *dev_id, const char *con_id)
{
	struct clk_lookup *cl;
	struct clk *clk = NULL;

	mutex_lock(&clocks_mutex);

	cl = clk_find(dev_id, con_id);
	if (!cl)
		goto out;

	if (!__clk_get(cl->clk)) {
		cl = NULL;
		goto out;
	}

#if defined(CONFIG_COMMON_CLK)
	clk = __clk_create_clk(__clk_get_hw(cl->clk), dev_id, con_id);
#else
	clk = cl->clk;
#endif

out:
	mutex_unlock(&clocks_mutex);

	return cl ? clk : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get_sys);

struct clk *clk_get(struct device *dev, const char *con_id)
{
	const char *dev_id = dev ? dev_name(dev) : NULL;
	struct clk *clk;

	if (dev) {
		clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
		if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
			return clk;
	}

	return clk_get_sys(dev_id, con_id);
}
EXPORT_SYMBOL(clk_get);

void clk_put(struct clk *clk)
{
	__clk_put(clk);
}
EXPORT_SYMBOL(clk_put);

void clkdev_add(struct clk_lookup *cl)
{
	mutex_lock(&clocks_mutex);
	list_add_tail(&cl->node, &clocks);
	mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clkdev_add);

void __init clkdev_add_table(struct clk_lookup *cl, size_t num)
{
	mutex_lock(&clocks_mutex);
	while (num--) {
		list_add_tail(&cl->node, &clocks);
		cl++;
	}
	mutex_unlock(&clocks_mutex);
}

#define MAX_DEV_ID	20
#define MAX_CON_ID	16

struct clk_lookup_alloc {
	struct clk_lookup cl;
	char	dev_id[MAX_DEV_ID];
	char	con_id[MAX_CON_ID];
};

static struct clk_lookup * __init_refok
vclkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt,
	va_list ap)
{
	struct clk_lookup_alloc *cla;

	cla = __clkdev_alloc(sizeof(*cla));
	if (!cla)
		return NULL;

	cla->cl.clk = clk;
	if (con_id) {
		strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
		cla->cl.con_id = cla->con_id;
	}

	if (dev_fmt) {
		vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
		cla->cl.dev_id = cla->dev_id;
	}

	return &cla->cl;
}

struct clk_lookup * __init_refok
clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
{
	struct clk_lookup *cl;
	va_list ap;

	va_start(ap, dev_fmt);
	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	va_end(ap);

	return cl;
}
EXPORT_SYMBOL(clkdev_alloc);

int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
	struct device *dev)
{
	struct clk *r = clk_get(dev, id);
	struct clk_lookup *l;

	if (IS_ERR(r))
		return PTR_ERR(r);

	l = clkdev_alloc(r, alias, alias_dev_name);
	clk_put(r);
	if (!l)
		return -ENODEV;
	clkdev_add(l);
	return 0;
}
EXPORT_SYMBOL(clk_add_alias);

/*
 * clkdev_drop - remove a clock dynamically allocated
 */
void clkdev_drop(struct clk_lookup *cl)
{
	mutex_lock(&clocks_mutex);
	list_del(&cl->node);
	mutex_unlock(&clocks_mutex);
	kfree(cl);
}
EXPORT_SYMBOL(clkdev_drop);

/**
 * clk_register_clkdev - register one clock lookup for a struct clk
 * @clk: struct clk to associate with all clk_lookups
 * @con_id: connection ID string on device
 * @dev_id: format string describing device name
 *
 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
 * clkdev.
 *
 * To make things easier for mass registration, we detect error clks
 * from a previous clk_register() call, and return the error code for
 * those.  This is to permit this function to be called immediately
 * after clk_register().
 */
int clk_register_clkdev(struct clk *clk, const char *con_id,
	const char *dev_fmt, ...)
{
	struct clk_lookup *cl;
	va_list ap;

	if (IS_ERR(clk))
		return PTR_ERR(clk);

	va_start(ap, dev_fmt);
	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	va_end(ap);

	if (!cl)
		return -ENOMEM;

	clkdev_add(cl);

	return 0;
}
EXPORT_SYMBOL(clk_register_clkdev);

/**
 * clk_register_clkdevs - register a set of clk_lookup for a struct clk
 * @clk: struct clk to associate with all clk_lookups
 * @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
 * @num: number of clk_lookup structures to register
 *
 * To make things easier for mass registration, we detect error clks
 * from a previous clk_register() call, and return the error code for
 * those.  This is to permit this function to be called immediately
 * after clk_register().
 */
int clk_register_clkdevs(struct clk *clk, struct clk_lookup *cl, size_t num)
{
	unsigned i;

	if (IS_ERR(clk))
		return PTR_ERR(clk);

	for (i = 0; i < num; i++, cl++) {
		cl->clk = clk;
		clkdev_add(cl);
	}

	return 0;
}
EXPORT_SYMBOL(clk_register_clkdevs);
Commit	Line	Data
0318e693	1	/*
6d803ba7	2	* drivers/clk/clkdev.c
0318e693 RK	3	*
	4	* Copyright (C) 2008 Russell King.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Helper for the clk API to assist looking up a struct clk.
	11	*/
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/device.h>
	15	#include <linux/list.h>
	16	#include <linux/errno.h>
	17	#include <linux/err.h>
	18	#include <linux/string.h>
	19	#include <linux/mutex.h>
c0c60c4b	20	#include <linux/clk.h>
6d803ba7	21	#include <linux/clkdev.h>
035a61c3	22	#include <linux/clk-provider.h>
766e6a4e	23	#include <linux/of.h>
0318e693	24
3a3d2b05 SN	25	#include "clk.h"
3a3d2b05 SN	26
0318e693 RK	27	static LIST_HEAD(clocks);
	28	static DEFINE_MUTEX(clocks_mutex);
	29
137f8a72	30	#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
7f05e28f SN	31
	32	/**
	33	* of_clk_get_by_clkspec() - Lookup a clock form a clock provider
	34	* @clkspec: pointer to a clock specifier data structure
	35	*
	36	* This function looks up a struct clk from the registered list of clock
	37	* providers, an input is a clock specifier data structure as returned
	38	* from the of_parse_phandle_with_args() function call.
	39	*/
	40	struct clk of_clk_get_by_clkspec(struct of_phandle_args clkspec)
	41	{
	42	struct clk *clk;
	43
	44	if (!clkspec)
	45	return ERR_PTR(-EINVAL);
	46
	47	of_clk_lock();
	48	clk = __of_clk_get_from_provider(clkspec);
	49
	50	if (!IS_ERR(clk) && !__clk_get(clk))
	51	clk = ERR_PTR(-ENOENT);
	52
	53	of_clk_unlock();
	54	return clk;
	55	}
	56
035a61c3	57	static struct clk __of_clk_get(struct device_node np, int index)
766e6a4e GL	58	{
	59	struct of_phandle_args clkspec;
	60	struct clk *clk;
	61	int rc;
	62
	63	if (index < 0)
	64	return ERR_PTR(-EINVAL);
	65
	66	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
	67	&clkspec);
	68	if (rc)
	69	return ERR_PTR(rc);
	70
7f05e28f	71	clk = of_clk_get_by_clkspec(&clkspec);
766e6a4e	72	of_node_put(clkspec.np);
035a61c3 TV	73
	74	return clk;
	75	}
	76
	77	struct clk of_clk_get(struct device_node np, int index)
	78	{
	79	struct clk *clk = __of_clk_get(np, index);
	80
	81	if (!IS_ERR(clk))
	82	clk = __clk_create_clk(__clk_get_hw(clk), np->full_name, NULL);
	83
766e6a4e GL	84	return clk;
	85	}
	86	EXPORT_SYMBOL(of_clk_get);
	87
035a61c3 TV	88	static struct clk __of_clk_get_by_name(struct device_node np,
	89	const char *dev_id,
	90	const char *name)
766e6a4e GL	91	{
	92	struct clk *clk = ERR_PTR(-ENOENT);
	93
	94	/* Walk up the tree of devices looking for a clock that matches */
	95	while (np) {
	96	int index = 0;
	97
	98	/*
	99	* For named clocks, first look up the name in the
	100	* "clock-names" property. If it cannot be found, then
	101	* index will be an error code, and of_clk_get() will fail.
	102	*/
	103	if (name)
	104	index = of_property_match_string(np, "clock-names", name);
035a61c3 TV	105	clk = __of_clk_get(np, index);
	106	if (!IS_ERR(clk)) {
	107	clk = __clk_create_clk(__clk_get_hw(clk), dev_id, name);
766e6a4e	108	break;
035a61c3	109	}
766e6a4e	110	else if (name && index >= 0) {
d8e53c3d SB	111	if (PTR_ERR(clk) != -EPROBE_DEFER)
	112	pr_err("ERROR: could not get clock %s:%s(%i)\n",
	113	np->full_name, name ? name : "", index);
766e6a4e GL	114	return clk;
	115	}
	116
	117	/*
	118	* No matching clock found on this node. If the parent node
	119	* has a "clock-ranges" property, then we can try one of its
	120	* clocks.
	121	*/
	122	np = np->parent;
	123	if (np && !of_get_property(np, "clock-ranges", NULL))
	124	break;
	125	}
	126
	127	return clk;
	128	}
035a61c3 TV	129
	130	/**
	131	* of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
	132	* @np: pointer to clock consumer node
	133	* @name: name of consumer's clock input, or NULL for the first clock reference
	134	*
	135	* This function parses the clocks and clock-names properties,
	136	* and uses them to look up the struct clk from the registered list of clock
	137	* providers.
	138	*/
	139	struct clk of_clk_get_by_name(struct device_node np, const char *name)
	140	{
	141	if (!np)
	142	return ERR_PTR(-ENOENT);
	143
	144	return __of_clk_get_by_name(np, np->full_name, name);
	145	}
766e6a4e	146	EXPORT_SYMBOL(of_clk_get_by_name);
035a61c3 TV	147
	148	#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */
	149
	150	static struct clk __of_clk_get_by_name(struct device_node np,
	151	const char *dev_id,
	152	const char *name)
	153	{
	154	return ERR_PTR(-ENOENT);
	155	}
766e6a4e GL	156	#endif
766e6a4e GL	157
409dc360 RK	158	/*
	159	* Find the correct struct clk for the device and connection ID.
	160	* We do slightly fuzzy matching here:
	161	* An entry with a NULL ID is assumed to be a wildcard.
	162	* If an entry has a device ID, it must match
	163	* If an entry has a connection ID, it must match
	164	* Then we take the most specific entry - with the following
659431fc	165	* order of precedence: dev+con > dev only > con only.
409dc360	166	*/
e8bf8df9	167	static struct clk_lookup clk_find(const char dev_id, const char *con_id)
0318e693	168	{
e8bf8df9	169	struct clk_lookup p, cl = NULL;
67b50871 VK	170	int match, best_found = 0, best_possible = 0;
	171
	172	if (dev_id)
	173	best_possible += 2;
	174	if (con_id)
	175	best_possible += 1;
0318e693 RK	176
0318e693 RK	177	list_for_each_entry(p, &clocks, node) {
0318e693	178	match = 0;
409dc360 RK	179	if (p->dev_id) {
	180	if (!dev_id \|\| strcmp(p->dev_id, dev_id))
	181	continue;
	182	match += 2;
	183	}
	184	if (p->con_id) {
	185	if (!con_id \|\| strcmp(p->con_id, con_id))
	186	continue;
	187	match += 1;
	188	}
0318e693	189
67b50871	190	if (match > best_found) {
e8bf8df9	191	cl = p;
67b50871 VK	192	if (match != best_possible)
67b50871 VK	193	best_found = match;
e4bf5bec VK	194	else
e4bf5bec VK	195	break;
0318e693 RK	196	}
0318e693 RK	197	}
e8bf8df9	198	return cl;
0318e693 RK	199	}
0318e693 RK	200
05fd8e73	201	struct clk clk_get_sys(const char dev_id, const char *con_id)
0318e693	202	{
e8bf8df9	203	struct clk_lookup *cl;
035a61c3	204	struct clk *clk = NULL;
0318e693 RK	205
0318e693 RK	206	mutex_lock(&clocks_mutex);
035a61c3	207
e8bf8df9	208	cl = clk_find(dev_id, con_id);
035a61c3 TV	209	if (!cl)
	210	goto out;
	211
	212	if (!__clk_get(cl->clk)) {
e8bf8df9	213	cl = NULL;
035a61c3 TV	214	goto out;
	215	}
	216
	217	#if defined(CONFIG_COMMON_CLK)
	218	clk = __clk_create_clk(__clk_get_hw(cl->clk), dev_id, con_id);
	219	#else
	220	clk = cl->clk;
	221	#endif
	222
	223	out:
0318e693 RK	224	mutex_unlock(&clocks_mutex);
0318e693 RK	225
035a61c3	226	return cl ? clk : ERR_PTR(-ENOENT);
0318e693	227	}
05fd8e73 SH	228	EXPORT_SYMBOL(clk_get_sys);
	229
	230	struct clk clk_get(struct device dev, const char *con_id)
	231	{
	232	const char *dev_id = dev ? dev_name(dev) : NULL;
766e6a4e GL	233	struct clk *clk;
	234
	235	if (dev) {
035a61c3 TV	236	clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
035a61c3 TV	237	if (!IS_ERR(clk) \|\| PTR_ERR(clk) == -EPROBE_DEFER)
a34cd466	238	return clk;
766e6a4e	239	}
05fd8e73 SH	240
	241	return clk_get_sys(dev_id, con_id);
	242	}
0318e693 RK	243	EXPORT_SYMBOL(clk_get);
	244
	245	void clk_put(struct clk *clk)
	246	{
	247	__clk_put(clk);
	248	}
	249	EXPORT_SYMBOL(clk_put);
	250
	251	void clkdev_add(struct clk_lookup *cl)
	252	{
	253	mutex_lock(&clocks_mutex);
	254	list_add_tail(&cl->node, &clocks);
	255	mutex_unlock(&clocks_mutex);
	256	}
	257	EXPORT_SYMBOL(clkdev_add);
	258
0a0300dc RK	259	void __init clkdev_add_table(struct clk_lookup *cl, size_t num)
	260	{
	261	mutex_lock(&clocks_mutex);
	262	while (num--) {
	263	list_add_tail(&cl->node, &clocks);
	264	cl++;
	265	}
	266	mutex_unlock(&clocks_mutex);
	267	}
	268
0318e693 RK	269	#define MAX_DEV_ID 20
	270	#define MAX_CON_ID 16
	271
	272	struct clk_lookup_alloc {
	273	struct clk_lookup cl;
	274	char dev_id[MAX_DEV_ID];
	275	char con_id[MAX_CON_ID];
	276	};
	277
e9d7f406 RK	278	static struct clk_lookup * __init_refok
	279	vclkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt,
	280	va_list ap)
0318e693 RK	281	{
	282	struct clk_lookup_alloc *cla;
	283
6d803ba7	284	cla = __clkdev_alloc(sizeof(*cla));
0318e693 RK	285	if (!cla)
	286	return NULL;
	287
	288	cla->cl.clk = clk;
	289	if (con_id) {
	290	strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
	291	cla->cl.con_id = cla->con_id;
	292	}
	293
	294	if (dev_fmt) {
0318e693 RK	295	vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
0318e693 RK	296	cla->cl.dev_id = cla->dev_id;
0318e693 RK	297	}
	298
	299	return &cla->cl;
	300	}
e9d7f406 RK	301
	302	struct clk_lookup * __init_refok
	303	clkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt, ...)
	304	{
	305	struct clk_lookup *cl;
	306	va_list ap;
	307
	308	va_start(ap, dev_fmt);
	309	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	310	va_end(ap);
	311
	312	return cl;
	313	}
0318e693 RK	314	EXPORT_SYMBOL(clkdev_alloc);
0318e693 RK	315
c0683039 TL	316	int clk_add_alias(const char alias, const char alias_dev_name, char *id,
	317	struct device *dev)
	318	{
	319	struct clk *r = clk_get(dev, id);
	320	struct clk_lookup *l;
	321
	322	if (IS_ERR(r))
	323	return PTR_ERR(r);
	324
	325	l = clkdev_alloc(r, alias, alias_dev_name);
	326	clk_put(r);
	327	if (!l)
	328	return -ENODEV;
	329	clkdev_add(l);
	330	return 0;
	331	}
	332	EXPORT_SYMBOL(clk_add_alias);
	333
0318e693 RK	334	/*
	335	* clkdev_drop - remove a clock dynamically allocated
	336	*/
	337	void clkdev_drop(struct clk_lookup *cl)
	338	{
	339	mutex_lock(&clocks_mutex);
	340	list_del(&cl->node);
	341	mutex_unlock(&clocks_mutex);
	342	kfree(cl);
	343	}
	344	EXPORT_SYMBOL(clkdev_drop);
e9d7f406 RK	345
	346	/**
	347	* clk_register_clkdev - register one clock lookup for a struct clk
	348	* @clk: struct clk to associate with all clk_lookups
	349	* @con_id: connection ID string on device
	350	* @dev_id: format string describing device name
	351	*
	352	* con_id or dev_id may be NULL as a wildcard, just as in the rest of
	353	* clkdev.
	354	*
	355	* To make things easier for mass registration, we detect error clks
	356	* from a previous clk_register() call, and return the error code for
	357	* those. This is to permit this function to be called immediately
	358	* after clk_register().
	359	*/
	360	int clk_register_clkdev(struct clk clk, const char con_id,
	361	const char *dev_fmt, ...)
	362	{
	363	struct clk_lookup *cl;
	364	va_list ap;
	365
	366	if (IS_ERR(clk))
	367	return PTR_ERR(clk);
	368
	369	va_start(ap, dev_fmt);
	370	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	371	va_end(ap);
	372
	373	if (!cl)
	374	return -ENOMEM;
	375
	376	clkdev_add(cl);
	377
	378	return 0;
	379	}
a251361a	380	EXPORT_SYMBOL(clk_register_clkdev);
e9d7f406 RK	381
	382	/**
	383	* clk_register_clkdevs - register a set of clk_lookup for a struct clk
	384	* @clk: struct clk to associate with all clk_lookups
	385	* @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
	386	* @num: number of clk_lookup structures to register
	387	*
	388	* To make things easier for mass registration, we detect error clks
	389	* from a previous clk_register() call, and return the error code for
	390	* those. This is to permit this function to be called immediately
	391	* after clk_register().
	392	*/
	393	int clk_register_clkdevs(struct clk clk, struct clk_lookup cl, size_t num)
	394	{
	395	unsigned i;
	396
	397	if (IS_ERR(clk))
	398	return PTR_ERR(clk);
	399
	400	for (i = 0; i < num; i++, cl++) {
	401	cl->clk = clk;
	402	clkdev_add(cl);
	403	}
	404
	405	return 0;
	406	}
	407	EXPORT_SYMBOL(clk_register_clkdevs);