Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/clk/clkdev.c
4 *
5 * Copyright (C) 2008 Russell King.
6 *
7 * Helper for the clk API to assist looking up a struct clk.
8 */
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/list.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/string.h>
16#include <linux/mutex.h>
17#include <linux/clk.h>
18#include <linux/clkdev.h>
19#include <linux/clk-provider.h>
20#include <linux/of.h>
21
22#include "clk.h"
23
24static LIST_HEAD(clocks);
25static DEFINE_MUTEX(clocks_mutex);
26
27/*
28 * Find the correct struct clk for the device and connection ID.
29 * We do slightly fuzzy matching here:
30 * An entry with a NULL ID is assumed to be a wildcard.
31 * If an entry has a device ID, it must match
32 * If an entry has a connection ID, it must match
33 * Then we take the most specific entry - with the following
34 * order of precedence: dev+con > dev only > con only.
35 */
36static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
37{
38 struct clk_lookup *p, *cl = NULL;
39 int match, best_found = 0, best_possible = 0;
40
41 if (dev_id)
42 best_possible += 2;
43 if (con_id)
44 best_possible += 1;
45
46 lockdep_assert_held(&clocks_mutex);
47
48 list_for_each_entry(p, &clocks, node) {
49 match = 0;
50 if (p->dev_id) {
51 if (!dev_id || strcmp(p->dev_id, dev_id))
52 continue;
53 match += 2;
54 }
55 if (p->con_id) {
56 if (!con_id || strcmp(p->con_id, con_id))
57 continue;
58 match += 1;
59 }
60
61 if (match > best_found) {
62 cl = p;
63 if (match != best_possible)
64 best_found = match;
65 else
66 break;
67 }
68 }
69 return cl;
70}
71
72struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
73{
74 struct clk_lookup *cl;
75 struct clk_hw *hw = ERR_PTR(-ENOENT);
76
77 mutex_lock(&clocks_mutex);
78 cl = clk_find(dev_id, con_id);
79 if (cl)
80 hw = cl->clk_hw;
81 mutex_unlock(&clocks_mutex);
82
83 return hw;
84}
85
86static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
87 const char *con_id)
88{
89 struct clk_hw *hw = clk_find_hw(dev_id, con_id);
90
91 return clk_hw_create_clk(dev, hw, dev_id, con_id);
92}
93
94struct clk *clk_get_sys(const char *dev_id, const char *con_id)
95{
96 return __clk_get_sys(NULL, dev_id, con_id);
97}
98EXPORT_SYMBOL(clk_get_sys);
99
100struct clk *clk_get(struct device *dev, const char *con_id)
101{
102 const char *dev_id = dev ? dev_name(dev) : NULL;
103 struct clk_hw *hw;
104
105 if (dev && dev->of_node) {
106 hw = of_clk_get_hw(dev->of_node, 0, con_id);
107 if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
108 return clk_hw_create_clk(dev, hw, dev_id, con_id);
109 }
110
111 return __clk_get_sys(dev, dev_id, con_id);
112}
113EXPORT_SYMBOL(clk_get);
114
115void clk_put(struct clk *clk)
116{
117 __clk_put(clk);
118}
119EXPORT_SYMBOL(clk_put);
120
121static void __clkdev_add(struct clk_lookup *cl)
122{
123 mutex_lock(&clocks_mutex);
124 list_add_tail(&cl->node, &clocks);
125 mutex_unlock(&clocks_mutex);
126}
127
128void clkdev_add(struct clk_lookup *cl)
129{
130 if (!cl->clk_hw)
131 cl->clk_hw = __clk_get_hw(cl->clk);
132 __clkdev_add(cl);
133}
134EXPORT_SYMBOL(clkdev_add);
135
136void clkdev_add_table(struct clk_lookup *cl, size_t num)
137{
138 mutex_lock(&clocks_mutex);
139 while (num--) {
140 cl->clk_hw = __clk_get_hw(cl->clk);
141 list_add_tail(&cl->node, &clocks);
142 cl++;
143 }
144 mutex_unlock(&clocks_mutex);
145}
146
147#define MAX_DEV_ID 24
148#define MAX_CON_ID 16
149
150struct clk_lookup_alloc {
151 struct clk_lookup cl;
152 char dev_id[MAX_DEV_ID];
153 char con_id[MAX_CON_ID];
154};
155
156static struct clk_lookup * __ref
157vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
158 va_list ap)
159{
160 struct clk_lookup_alloc *cla;
161 struct va_format vaf;
162 const char *failure;
163 va_list ap_copy;
164 size_t max_size;
165 ssize_t res;
166
167 cla = kzalloc(sizeof(*cla), GFP_KERNEL);
168 if (!cla)
169 return NULL;
170
171 va_copy(ap_copy, ap);
172
173 cla->cl.clk_hw = hw;
174 if (con_id) {
175 res = strscpy(cla->con_id, con_id, sizeof(cla->con_id));
176 if (res < 0) {
177 max_size = sizeof(cla->con_id);
178 failure = "connection";
179 goto fail;
180 }
181 cla->cl.con_id = cla->con_id;
182 }
183
184 if (dev_fmt) {
185 res = vsnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
186 if (res >= sizeof(cla->dev_id)) {
187 max_size = sizeof(cla->dev_id);
188 failure = "device";
189 goto fail;
190 }
191 cla->cl.dev_id = cla->dev_id;
192 }
193
194 va_end(ap_copy);
195
196 return &cla->cl;
197
198fail:
199 if (dev_fmt)
200 vaf.fmt = dev_fmt;
201 else
202 vaf.fmt = "null-device";
203 vaf.va = &ap_copy;
204 pr_err("%pV:%s: %s ID is greater than %zu\n",
205 &vaf, con_id, failure, max_size);
206 va_end(ap_copy);
207
208 /*
209 * Don't fail in this case, but as the entry won't ever match just
210 * fill it with something that also won't match.
211 */
212 strscpy(cla->con_id, "bad", sizeof(cla->con_id));
213 strscpy(cla->dev_id, "bad", sizeof(cla->dev_id));
214
215 return &cla->cl;
216}
217
218static struct clk_lookup *
219vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
220 va_list ap)
221{
222 struct clk_lookup *cl;
223
224 cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
225 if (cl)
226 __clkdev_add(cl);
227
228 return cl;
229}
230
231/**
232 * clkdev_create - allocate and add a clkdev lookup structure
233 * @clk: struct clk to associate with all clk_lookups
234 * @con_id: connection ID string on device
235 * @dev_fmt: format string describing device name
236 *
237 * Returns a clk_lookup structure, which can be later unregistered and
238 * freed.
239 */
240struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
241 const char *dev_fmt, ...)
242{
243 struct clk_lookup *cl;
244 va_list ap;
245
246 va_start(ap, dev_fmt);
247 cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap);
248 va_end(ap);
249
250 return cl;
251}
252EXPORT_SYMBOL_GPL(clkdev_create);
253
254/**
255 * clkdev_hw_create - allocate and add a clkdev lookup structure
256 * @hw: struct clk_hw to associate with all clk_lookups
257 * @con_id: connection ID string on device
258 * @dev_fmt: format string describing device name
259 *
260 * Returns a clk_lookup structure, which can be later unregistered and
261 * freed.
262 */
263struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
264 const char *dev_fmt, ...)
265{
266 struct clk_lookup *cl;
267 va_list ap;
268
269 va_start(ap, dev_fmt);
270 cl = vclkdev_create(hw, con_id, dev_fmt, ap);
271 va_end(ap);
272
273 return cl;
274}
275EXPORT_SYMBOL_GPL(clkdev_hw_create);
276
277int clk_add_alias(const char *alias, const char *alias_dev_name,
278 const char *con_id, struct device *dev)
279{
280 struct clk *r = clk_get(dev, con_id);
281 struct clk_lookup *l;
282
283 if (IS_ERR(r))
284 return PTR_ERR(r);
285
286 l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
287 alias_dev_name);
288 clk_put(r);
289
290 return l ? 0 : -ENODEV;
291}
292EXPORT_SYMBOL(clk_add_alias);
293
294/*
295 * clkdev_drop - remove a clock dynamically allocated
296 */
297void clkdev_drop(struct clk_lookup *cl)
298{
299 mutex_lock(&clocks_mutex);
300 list_del(&cl->node);
301 mutex_unlock(&clocks_mutex);
302 kfree(cl);
303}
304EXPORT_SYMBOL(clkdev_drop);
305
306static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
307 const char *con_id,
308 const char *dev_id, ...)
309{
310 struct clk_lookup *cl;
311 va_list ap;
312
313 va_start(ap, dev_id);
314 cl = vclkdev_create(hw, con_id, dev_id, ap);
315 va_end(ap);
316
317 return cl;
318}
319
320static int do_clk_register_clkdev(struct clk_hw *hw,
321 struct clk_lookup **cl, const char *con_id, const char *dev_id)
322{
323 if (IS_ERR(hw))
324 return PTR_ERR(hw);
325 /*
326 * Since dev_id can be NULL, and NULL is handled specially, we must
327 * pass it as either a NULL format string, or with "%s".
328 */
329 if (dev_id)
330 *cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
331 else
332 *cl = __clk_register_clkdev(hw, con_id, NULL);
333
334 return *cl ? 0 : -ENOMEM;
335}
336
337/**
338 * clk_register_clkdev - register one clock lookup for a struct clk
339 * @clk: struct clk to associate with all clk_lookups
340 * @con_id: connection ID string on device
341 * @dev_id: string describing device name
342 *
343 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
344 * clkdev.
345 *
346 * To make things easier for mass registration, we detect error clks
347 * from a previous clk_register() call, and return the error code for
348 * those. This is to permit this function to be called immediately
349 * after clk_register().
350 */
351int clk_register_clkdev(struct clk *clk, const char *con_id,
352 const char *dev_id)
353{
354 struct clk_lookup *cl;
355
356 if (IS_ERR(clk))
357 return PTR_ERR(clk);
358
359 return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
360 dev_id);
361}
362EXPORT_SYMBOL(clk_register_clkdev);
363
364/**
365 * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw
366 * @hw: struct clk_hw to associate with all clk_lookups
367 * @con_id: connection ID string on device
368 * @dev_id: format string describing device name
369 *
370 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
371 * clkdev.
372 *
373 * To make things easier for mass registration, we detect error clk_hws
374 * from a previous clk_hw_register_*() call, and return the error code for
375 * those. This is to permit this function to be called immediately
376 * after clk_hw_register_*().
377 */
378int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
379 const char *dev_id)
380{
381 struct clk_lookup *cl;
382
383 return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
384}
385EXPORT_SYMBOL(clk_hw_register_clkdev);
386
387static void devm_clkdev_release(void *res)
388{
389 clkdev_drop(res);
390}
391
392/**
393 * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
394 * @dev: device this lookup is bound
395 * @hw: struct clk_hw to associate with all clk_lookups
396 * @con_id: connection ID string on device
397 * @dev_id: format string describing device name
398 *
399 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
400 * clkdev.
401 *
402 * To make things easier for mass registration, we detect error clk_hws
403 * from a previous clk_hw_register_*() call, and return the error code for
404 * those. This is to permit this function to be called immediately
405 * after clk_hw_register_*().
406 */
407int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
408 const char *con_id, const char *dev_id)
409{
410 struct clk_lookup *cl;
411 int rval;
412
413 rval = do_clk_register_clkdev(hw, &cl, con_id, dev_id);
414 if (rval)
415 return rval;
416
417 return devm_add_action_or_reset(dev, devm_clkdev_release, cl);
418}
419EXPORT_SYMBOL(devm_clk_hw_register_clkdev);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/clk/clkdev.c
4 *
5 * Copyright (C) 2008 Russell King.
6 *
7 * Helper for the clk API to assist looking up a struct clk.
8 */
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/list.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/string.h>
16#include <linux/mutex.h>
17#include <linux/clk.h>
18#include <linux/clkdev.h>
19#include <linux/clk-provider.h>
20#include <linux/of.h>
21
22#include "clk.h"
23
24static LIST_HEAD(clocks);
25static DEFINE_MUTEX(clocks_mutex);
26
27/*
28 * Find the correct struct clk for the device and connection ID.
29 * We do slightly fuzzy matching here:
30 * An entry with a NULL ID is assumed to be a wildcard.
31 * If an entry has a device ID, it must match
32 * If an entry has a connection ID, it must match
33 * Then we take the most specific entry - with the following
34 * order of precedence: dev+con > dev only > con only.
35 */
36static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
37{
38 struct clk_lookup *p, *cl = NULL;
39 int match, best_found = 0, best_possible = 0;
40
41 if (dev_id)
42 best_possible += 2;
43 if (con_id)
44 best_possible += 1;
45
46 lockdep_assert_held(&clocks_mutex);
47
48 list_for_each_entry(p, &clocks, node) {
49 match = 0;
50 if (p->dev_id) {
51 if (!dev_id || strcmp(p->dev_id, dev_id))
52 continue;
53 match += 2;
54 }
55 if (p->con_id) {
56 if (!con_id || strcmp(p->con_id, con_id))
57 continue;
58 match += 1;
59 }
60
61 if (match > best_found) {
62 cl = p;
63 if (match != best_possible)
64 best_found = match;
65 else
66 break;
67 }
68 }
69 return cl;
70}
71
72struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
73{
74 struct clk_lookup *cl;
75 struct clk_hw *hw = ERR_PTR(-ENOENT);
76
77 mutex_lock(&clocks_mutex);
78 cl = clk_find(dev_id, con_id);
79 if (cl)
80 hw = cl->clk_hw;
81 mutex_unlock(&clocks_mutex);
82
83 return hw;
84}
85
86static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
87 const char *con_id)
88{
89 struct clk_hw *hw = clk_find_hw(dev_id, con_id);
90
91 return clk_hw_create_clk(dev, hw, dev_id, con_id);
92}
93
94struct clk *clk_get_sys(const char *dev_id, const char *con_id)
95{
96 return __clk_get_sys(NULL, dev_id, con_id);
97}
98EXPORT_SYMBOL(clk_get_sys);
99
100struct clk *clk_get(struct device *dev, const char *con_id)
101{
102 const char *dev_id = dev ? dev_name(dev) : NULL;
103 struct clk_hw *hw;
104
105 if (dev && dev->of_node) {
106 hw = of_clk_get_hw(dev->of_node, 0, con_id);
107 if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
108 return clk_hw_create_clk(dev, hw, dev_id, con_id);
109 }
110
111 return __clk_get_sys(dev, dev_id, con_id);
112}
113EXPORT_SYMBOL(clk_get);
114
115void clk_put(struct clk *clk)
116{
117 __clk_put(clk);
118}
119EXPORT_SYMBOL(clk_put);
120
121static void __clkdev_add(struct clk_lookup *cl)
122{
123 mutex_lock(&clocks_mutex);
124 list_add_tail(&cl->node, &clocks);
125 mutex_unlock(&clocks_mutex);
126}
127
128void clkdev_add(struct clk_lookup *cl)
129{
130 if (!cl->clk_hw)
131 cl->clk_hw = __clk_get_hw(cl->clk);
132 __clkdev_add(cl);
133}
134EXPORT_SYMBOL(clkdev_add);
135
136void clkdev_add_table(struct clk_lookup *cl, size_t num)
137{
138 mutex_lock(&clocks_mutex);
139 while (num--) {
140 cl->clk_hw = __clk_get_hw(cl->clk);
141 list_add_tail(&cl->node, &clocks);
142 cl++;
143 }
144 mutex_unlock(&clocks_mutex);
145}
146
147#define MAX_DEV_ID 20
148#define MAX_CON_ID 16
149
150struct clk_lookup_alloc {
151 struct clk_lookup cl;
152 char dev_id[MAX_DEV_ID];
153 char con_id[MAX_CON_ID];
154};
155
156static struct clk_lookup * __ref
157vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
158 va_list ap)
159{
160 struct clk_lookup_alloc *cla;
161
162 cla = kzalloc(sizeof(*cla), GFP_KERNEL);
163 if (!cla)
164 return NULL;
165
166 cla->cl.clk_hw = hw;
167 if (con_id) {
168 strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
169 cla->cl.con_id = cla->con_id;
170 }
171
172 if (dev_fmt) {
173 vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
174 cla->cl.dev_id = cla->dev_id;
175 }
176
177 return &cla->cl;
178}
179
180static struct clk_lookup *
181vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
182 va_list ap)
183{
184 struct clk_lookup *cl;
185
186 cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
187 if (cl)
188 __clkdev_add(cl);
189
190 return cl;
191}
192
193struct clk_lookup * __ref
194clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
195{
196 struct clk_lookup *cl;
197 va_list ap;
198
199 va_start(ap, dev_fmt);
200 cl = vclkdev_alloc(__clk_get_hw(clk), con_id, dev_fmt, ap);
201 va_end(ap);
202
203 return cl;
204}
205EXPORT_SYMBOL(clkdev_alloc);
206
207struct clk_lookup *
208clkdev_hw_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...)
209{
210 struct clk_lookup *cl;
211 va_list ap;
212
213 va_start(ap, dev_fmt);
214 cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
215 va_end(ap);
216
217 return cl;
218}
219EXPORT_SYMBOL(clkdev_hw_alloc);
220
221/**
222 * clkdev_create - allocate and add a clkdev lookup structure
223 * @clk: struct clk to associate with all clk_lookups
224 * @con_id: connection ID string on device
225 * @dev_fmt: format string describing device name
226 *
227 * Returns a clk_lookup structure, which can be later unregistered and
228 * freed.
229 */
230struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
231 const char *dev_fmt, ...)
232{
233 struct clk_lookup *cl;
234 va_list ap;
235
236 va_start(ap, dev_fmt);
237 cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap);
238 va_end(ap);
239
240 return cl;
241}
242EXPORT_SYMBOL_GPL(clkdev_create);
243
244/**
245 * clkdev_hw_create - allocate and add a clkdev lookup structure
246 * @hw: struct clk_hw to associate with all clk_lookups
247 * @con_id: connection ID string on device
248 * @dev_fmt: format string describing device name
249 *
250 * Returns a clk_lookup structure, which can be later unregistered and
251 * freed.
252 */
253struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
254 const char *dev_fmt, ...)
255{
256 struct clk_lookup *cl;
257 va_list ap;
258
259 va_start(ap, dev_fmt);
260 cl = vclkdev_create(hw, con_id, dev_fmt, ap);
261 va_end(ap);
262
263 return cl;
264}
265EXPORT_SYMBOL_GPL(clkdev_hw_create);
266
267int clk_add_alias(const char *alias, const char *alias_dev_name,
268 const char *con_id, struct device *dev)
269{
270 struct clk *r = clk_get(dev, con_id);
271 struct clk_lookup *l;
272
273 if (IS_ERR(r))
274 return PTR_ERR(r);
275
276 l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
277 alias_dev_name);
278 clk_put(r);
279
280 return l ? 0 : -ENODEV;
281}
282EXPORT_SYMBOL(clk_add_alias);
283
284/*
285 * clkdev_drop - remove a clock dynamically allocated
286 */
287void clkdev_drop(struct clk_lookup *cl)
288{
289 mutex_lock(&clocks_mutex);
290 list_del(&cl->node);
291 mutex_unlock(&clocks_mutex);
292 kfree(cl);
293}
294EXPORT_SYMBOL(clkdev_drop);
295
296static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
297 const char *con_id,
298 const char *dev_id, ...)
299{
300 struct clk_lookup *cl;
301 va_list ap;
302
303 va_start(ap, dev_id);
304 cl = vclkdev_create(hw, con_id, dev_id, ap);
305 va_end(ap);
306
307 return cl;
308}
309
310static int do_clk_register_clkdev(struct clk_hw *hw,
311 struct clk_lookup **cl, const char *con_id, const char *dev_id)
312{
313 if (IS_ERR(hw))
314 return PTR_ERR(hw);
315 /*
316 * Since dev_id can be NULL, and NULL is handled specially, we must
317 * pass it as either a NULL format string, or with "%s".
318 */
319 if (dev_id)
320 *cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
321 else
322 *cl = __clk_register_clkdev(hw, con_id, NULL);
323
324 return *cl ? 0 : -ENOMEM;
325}
326
327/**
328 * clk_register_clkdev - register one clock lookup for a struct clk
329 * @clk: struct clk to associate with all clk_lookups
330 * @con_id: connection ID string on device
331 * @dev_id: string describing device name
332 *
333 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
334 * clkdev.
335 *
336 * To make things easier for mass registration, we detect error clks
337 * from a previous clk_register() call, and return the error code for
338 * those. This is to permit this function to be called immediately
339 * after clk_register().
340 */
341int clk_register_clkdev(struct clk *clk, const char *con_id,
342 const char *dev_id)
343{
344 struct clk_lookup *cl;
345
346 if (IS_ERR(clk))
347 return PTR_ERR(clk);
348
349 return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
350 dev_id);
351}
352EXPORT_SYMBOL(clk_register_clkdev);
353
354/**
355 * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw
356 * @hw: struct clk_hw to associate with all clk_lookups
357 * @con_id: connection ID string on device
358 * @dev_id: format string describing device name
359 *
360 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
361 * clkdev.
362 *
363 * To make things easier for mass registration, we detect error clk_hws
364 * from a previous clk_hw_register_*() call, and return the error code for
365 * those. This is to permit this function to be called immediately
366 * after clk_hw_register_*().
367 */
368int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
369 const char *dev_id)
370{
371 struct clk_lookup *cl;
372
373 return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
374}
375EXPORT_SYMBOL(clk_hw_register_clkdev);
376
377static void devm_clkdev_release(struct device *dev, void *res)
378{
379 clkdev_drop(*(struct clk_lookup **)res);
380}
381
382static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
383{
384 struct clk_lookup **l = res;
385
386 return *l == data;
387}
388
389/**
390 * devm_clk_release_clkdev - Resource managed clkdev lookup release
391 * @dev: device this lookup is bound
392 * @con_id: connection ID string on device
393 * @dev_id: format string describing device name
394 *
395 * Drop the clkdev lookup created with devm_clk_hw_register_clkdev.
396 * Normally this function will not need to be called and the resource
397 * management code will ensure that the resource is freed.
398 */
399void devm_clk_release_clkdev(struct device *dev, const char *con_id,
400 const char *dev_id)
401{
402 struct clk_lookup *cl;
403 int rval;
404
405 mutex_lock(&clocks_mutex);
406 cl = clk_find(dev_id, con_id);
407 mutex_unlock(&clocks_mutex);
408
409 WARN_ON(!cl);
410 rval = devres_release(dev, devm_clkdev_release,
411 devm_clk_match_clkdev, cl);
412 WARN_ON(rval);
413}
414EXPORT_SYMBOL(devm_clk_release_clkdev);
415
416/**
417 * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
418 * @dev: device this lookup is bound
419 * @hw: struct clk_hw to associate with all clk_lookups
420 * @con_id: connection ID string on device
421 * @dev_id: format string describing device name
422 *
423 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
424 * clkdev.
425 *
426 * To make things easier for mass registration, we detect error clk_hws
427 * from a previous clk_hw_register_*() call, and return the error code for
428 * those. This is to permit this function to be called immediately
429 * after clk_hw_register_*().
430 */
431int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
432 const char *con_id, const char *dev_id)
433{
434 int rval = -ENOMEM;
435 struct clk_lookup **cl;
436
437 cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
438 if (cl) {
439 rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
440 if (!rval)
441 devres_add(dev, cl);
442 else
443 devres_free(cl);
444 }
445 return rval;
446}
447EXPORT_SYMBOL(devm_clk_hw_register_clkdev);