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2744e8af LW |
1 | /* |
2 | * Core driver for the pin control subsystem | |
3 | * | |
4 | * Copyright (C) 2011 ST-Ericsson SA | |
5 | * Written on behalf of Linaro for ST-Ericsson | |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
10 | * License terms: GNU General Public License (GPL) version 2 | |
11 | */ | |
12 | #define pr_fmt(fmt) "pinctrl core: " fmt | |
13 | ||
14 | #include <linux/kernel.h> | |
a5a697cd | 15 | #include <linux/export.h> |
2744e8af LW |
16 | #include <linux/init.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/radix-tree.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/pinctrl/pinctrl.h> | |
28 | #include <linux/pinctrl/machine.h> | |
29 | #include "core.h" | |
30 | #include "pinmux.h" | |
31 | ||
32 | /* Global list of pin control devices */ | |
33 | static DEFINE_MUTEX(pinctrldev_list_mutex); | |
34 | static LIST_HEAD(pinctrldev_list); | |
35 | ||
36 | static void pinctrl_dev_release(struct device *dev) | |
37 | { | |
38 | struct pinctrl_dev *pctldev = dev_get_drvdata(dev); | |
39 | kfree(pctldev); | |
40 | } | |
41 | ||
42 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) | |
43 | { | |
44 | /* We're not allowed to register devices without name */ | |
45 | return pctldev->desc->name; | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
48 | ||
49 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
50 | { | |
51 | return pctldev->driver_data; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
54 | ||
55 | /** | |
56 | * get_pinctrl_dev_from_dev() - look up pin controller device | |
57 | * @dev: a device pointer, this may be NULL but then devname needs to be | |
58 | * defined instead | |
59 | * @devname: the name of a device instance, as returned by dev_name(), this | |
60 | * may be NULL but then dev needs to be defined instead | |
61 | * | |
62 | * Looks up a pin control device matching a certain device name or pure device | |
63 | * pointer, the pure device pointer will take precedence. | |
64 | */ | |
65 | struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev, | |
66 | const char *devname) | |
67 | { | |
68 | struct pinctrl_dev *pctldev = NULL; | |
69 | bool found = false; | |
70 | ||
71 | mutex_lock(&pinctrldev_list_mutex); | |
72 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
73 | if (dev && &pctldev->dev == dev) { | |
74 | /* Matched on device pointer */ | |
75 | found = true; | |
76 | break; | |
77 | } | |
78 | ||
79 | if (devname && | |
80 | !strcmp(dev_name(&pctldev->dev), devname)) { | |
81 | /* Matched on device name */ | |
82 | found = true; | |
83 | break; | |
84 | } | |
85 | } | |
86 | mutex_unlock(&pinctrldev_list_mutex); | |
87 | ||
88 | return found ? pctldev : NULL; | |
89 | } | |
90 | ||
91 | struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin) | |
92 | { | |
93 | struct pin_desc *pindesc; | |
94 | unsigned long flags; | |
95 | ||
96 | spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags); | |
97 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
98 | spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags); | |
99 | ||
100 | return pindesc; | |
101 | } | |
102 | ||
103 | /** | |
104 | * pin_is_valid() - check if pin exists on controller | |
105 | * @pctldev: the pin control device to check the pin on | |
106 | * @pin: pin to check, use the local pin controller index number | |
107 | * | |
108 | * This tells us whether a certain pin exist on a certain pin controller or | |
109 | * not. Pin lists may be sparse, so some pins may not exist. | |
110 | */ | |
111 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
112 | { | |
113 | struct pin_desc *pindesc; | |
114 | ||
115 | if (pin < 0) | |
116 | return false; | |
117 | ||
118 | pindesc = pin_desc_get(pctldev, pin); | |
119 | if (pindesc == NULL) | |
120 | return false; | |
121 | ||
122 | return true; | |
123 | } | |
124 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
125 | ||
126 | /* Deletes a range of pin descriptors */ | |
127 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
128 | const struct pinctrl_pin_desc *pins, | |
129 | unsigned num_pins) | |
130 | { | |
131 | int i; | |
132 | ||
133 | spin_lock(&pctldev->pin_desc_tree_lock); | |
134 | for (i = 0; i < num_pins; i++) { | |
135 | struct pin_desc *pindesc; | |
136 | ||
137 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
138 | pins[i].number); | |
139 | if (pindesc != NULL) { | |
140 | radix_tree_delete(&pctldev->pin_desc_tree, | |
141 | pins[i].number); | |
142 | } | |
143 | kfree(pindesc); | |
144 | } | |
145 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
146 | } | |
147 | ||
148 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
149 | unsigned number, const char *name) | |
150 | { | |
151 | struct pin_desc *pindesc; | |
152 | ||
153 | pindesc = pin_desc_get(pctldev, number); | |
154 | if (pindesc != NULL) { | |
155 | pr_err("pin %d already registered on %s\n", number, | |
156 | pctldev->desc->name); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
161 | if (pindesc == NULL) | |
162 | return -ENOMEM; | |
163 | spin_lock_init(&pindesc->lock); | |
164 | ||
165 | /* Set owner */ | |
166 | pindesc->pctldev = pctldev; | |
167 | ||
9af1e44f SW |
168 | /* Copy basic pin info */ |
169 | pindesc->name = name; | |
2744e8af LW |
170 | |
171 | spin_lock(&pctldev->pin_desc_tree_lock); | |
172 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); | |
173 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
174 | pr_debug("registered pin %d (%s) on %s\n", | |
175 | number, name ? name : "(unnamed)", pctldev->desc->name); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
180 | struct pinctrl_pin_desc const *pins, | |
181 | unsigned num_descs) | |
182 | { | |
183 | unsigned i; | |
184 | int ret = 0; | |
185 | ||
186 | for (i = 0; i < num_descs; i++) { | |
187 | ret = pinctrl_register_one_pin(pctldev, | |
188 | pins[i].number, pins[i].name); | |
189 | if (ret) | |
190 | return ret; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /** | |
197 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
198 | * @pctldev: pin controller device to check | |
199 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
200 | * | |
201 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
202 | * controller, return the range or NULL | |
203 | */ | |
204 | static struct pinctrl_gpio_range * | |
205 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
206 | { | |
207 | struct pinctrl_gpio_range *range = NULL; | |
208 | ||
209 | /* Loop over the ranges */ | |
210 | mutex_lock(&pctldev->gpio_ranges_lock); | |
211 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
212 | /* Check if we're in the valid range */ | |
213 | if (gpio >= range->base && | |
214 | gpio < range->base + range->npins) { | |
215 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
216 | return range; | |
217 | } | |
218 | } | |
219 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
224 | /** | |
225 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
226 | * @gpio: the pin to locate the pin controller for | |
227 | * @outdev: the pin control device if found | |
228 | * @outrange: the GPIO range if found | |
229 | * | |
230 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
231 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
232 | * negative if the GPIO range could not be found in any device. | |
233 | */ | |
234 | int pinctrl_get_device_gpio_range(unsigned gpio, | |
235 | struct pinctrl_dev **outdev, | |
236 | struct pinctrl_gpio_range **outrange) | |
237 | { | |
238 | struct pinctrl_dev *pctldev = NULL; | |
239 | ||
240 | /* Loop over the pin controllers */ | |
241 | mutex_lock(&pinctrldev_list_mutex); | |
242 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
243 | struct pinctrl_gpio_range *range; | |
244 | ||
245 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
246 | if (range != NULL) { | |
247 | *outdev = pctldev; | |
248 | *outrange = range; | |
249 | mutex_unlock(&pinctrldev_list_mutex); | |
250 | return 0; | |
251 | } | |
252 | } | |
253 | mutex_unlock(&pinctrldev_list_mutex); | |
254 | ||
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | /** | |
259 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
260 | * @pctldev: pin controller device to add the range to | |
261 | * @range: the GPIO range to add | |
262 | * | |
263 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
264 | * this to register handled ranges after registering your pin controller. | |
265 | */ | |
266 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
267 | struct pinctrl_gpio_range *range) | |
268 | { | |
269 | mutex_lock(&pctldev->gpio_ranges_lock); | |
270 | list_add(&range->node, &pctldev->gpio_ranges); | |
271 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
272 | } | |
273 | ||
274 | /** | |
275 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
276 | * @pctldev: pin controller device to remove the range from | |
277 | * @range: the GPIO range to remove | |
278 | */ | |
279 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
280 | struct pinctrl_gpio_range *range) | |
281 | { | |
282 | mutex_lock(&pctldev->gpio_ranges_lock); | |
283 | list_del(&range->node); | |
284 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
285 | } | |
286 | ||
287 | #ifdef CONFIG_DEBUG_FS | |
288 | ||
289 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
290 | { | |
291 | struct pinctrl_dev *pctldev = s->private; | |
292 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
293 | unsigned pin; | |
294 | ||
295 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
296 | seq_printf(s, "max pin number: %d\n", pctldev->desc->maxpin); | |
297 | ||
298 | /* The highest pin number need to be included in the loop, thus <= */ | |
299 | for (pin = 0; pin <= pctldev->desc->maxpin; pin++) { | |
300 | struct pin_desc *desc; | |
301 | ||
302 | desc = pin_desc_get(pctldev, pin); | |
303 | /* Pin space may be sparse */ | |
304 | if (desc == NULL) | |
305 | continue; | |
306 | ||
307 | seq_printf(s, "pin %d (%s) ", pin, | |
308 | desc->name ? desc->name : "unnamed"); | |
309 | ||
310 | /* Driver-specific info per pin */ | |
311 | if (ops->pin_dbg_show) | |
312 | ops->pin_dbg_show(pctldev, s, pin); | |
313 | ||
314 | seq_puts(s, "\n"); | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
321 | { | |
322 | struct pinctrl_dev *pctldev = s->private; | |
323 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
324 | unsigned selector = 0; | |
325 | ||
326 | /* No grouping */ | |
327 | if (!ops) | |
328 | return 0; | |
329 | ||
330 | seq_puts(s, "registered pin groups:\n"); | |
331 | while (ops->list_groups(pctldev, selector) >= 0) { | |
a5818a8b | 332 | const unsigned *pins; |
2744e8af LW |
333 | unsigned num_pins; |
334 | const char *gname = ops->get_group_name(pctldev, selector); | |
335 | int ret; | |
336 | int i; | |
337 | ||
338 | ret = ops->get_group_pins(pctldev, selector, | |
339 | &pins, &num_pins); | |
340 | if (ret) | |
341 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
342 | gname); | |
343 | else { | |
344 | seq_printf(s, "group: %s, pins = [ ", gname); | |
345 | for (i = 0; i < num_pins; i++) | |
346 | seq_printf(s, "%d ", pins[i]); | |
347 | seq_puts(s, "]\n"); | |
348 | } | |
349 | selector++; | |
350 | } | |
351 | ||
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
357 | { | |
358 | struct pinctrl_dev *pctldev = s->private; | |
359 | struct pinctrl_gpio_range *range = NULL; | |
360 | ||
361 | seq_puts(s, "GPIO ranges handled:\n"); | |
362 | ||
363 | /* Loop over the ranges */ | |
364 | mutex_lock(&pctldev->gpio_ranges_lock); | |
365 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
366 | seq_printf(s, "%u: %s [%u - %u]\n", range->id, range->name, | |
367 | range->base, (range->base + range->npins - 1)); | |
368 | } | |
369 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | static int pinctrl_devices_show(struct seq_file *s, void *what) | |
375 | { | |
376 | struct pinctrl_dev *pctldev; | |
377 | ||
378 | seq_puts(s, "name [pinmux]\n"); | |
379 | mutex_lock(&pinctrldev_list_mutex); | |
380 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
381 | seq_printf(s, "%s ", pctldev->desc->name); | |
382 | if (pctldev->desc->pmxops) | |
383 | seq_puts(s, "yes"); | |
384 | else | |
385 | seq_puts(s, "no"); | |
386 | seq_puts(s, "\n"); | |
387 | } | |
388 | mutex_unlock(&pinctrldev_list_mutex); | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static int pinctrl_pins_open(struct inode *inode, struct file *file) | |
394 | { | |
395 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
396 | } | |
397 | ||
398 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
399 | { | |
400 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
401 | } | |
402 | ||
403 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
404 | { | |
405 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
406 | } | |
407 | ||
408 | static int pinctrl_devices_open(struct inode *inode, struct file *file) | |
409 | { | |
410 | return single_open(file, pinctrl_devices_show, NULL); | |
411 | } | |
412 | ||
413 | static const struct file_operations pinctrl_pins_ops = { | |
414 | .open = pinctrl_pins_open, | |
415 | .read = seq_read, | |
416 | .llseek = seq_lseek, | |
417 | .release = single_release, | |
418 | }; | |
419 | ||
420 | static const struct file_operations pinctrl_groups_ops = { | |
421 | .open = pinctrl_groups_open, | |
422 | .read = seq_read, | |
423 | .llseek = seq_lseek, | |
424 | .release = single_release, | |
425 | }; | |
426 | ||
427 | static const struct file_operations pinctrl_gpioranges_ops = { | |
428 | .open = pinctrl_gpioranges_open, | |
429 | .read = seq_read, | |
430 | .llseek = seq_lseek, | |
431 | .release = single_release, | |
432 | }; | |
433 | ||
434 | static const struct file_operations pinctrl_devices_ops = { | |
435 | .open = pinctrl_devices_open, | |
436 | .read = seq_read, | |
437 | .llseek = seq_lseek, | |
438 | .release = single_release, | |
439 | }; | |
440 | ||
441 | static struct dentry *debugfs_root; | |
442 | ||
443 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
444 | { | |
445 | static struct dentry *device_root; | |
446 | ||
447 | device_root = debugfs_create_dir(dev_name(&pctldev->dev), | |
448 | debugfs_root); | |
449 | if (IS_ERR(device_root) || !device_root) { | |
450 | pr_warn("failed to create debugfs directory for %s\n", | |
451 | dev_name(&pctldev->dev)); | |
452 | return; | |
453 | } | |
454 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
455 | device_root, pctldev, &pinctrl_pins_ops); | |
456 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
457 | device_root, pctldev, &pinctrl_groups_ops); | |
458 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
459 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
460 | pinmux_init_device_debugfs(device_root, pctldev); | |
461 | } | |
462 | ||
463 | static void pinctrl_init_debugfs(void) | |
464 | { | |
465 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
466 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
467 | pr_warn("failed to create debugfs directory\n"); | |
468 | debugfs_root = NULL; | |
469 | return; | |
470 | } | |
471 | ||
472 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
473 | debugfs_root, NULL, &pinctrl_devices_ops); | |
474 | pinmux_init_debugfs(debugfs_root); | |
475 | } | |
476 | ||
477 | #else /* CONFIG_DEBUG_FS */ | |
478 | ||
479 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
480 | { | |
481 | } | |
482 | ||
483 | static void pinctrl_init_debugfs(void) | |
484 | { | |
485 | } | |
486 | ||
487 | #endif | |
488 | ||
489 | /** | |
490 | * pinctrl_register() - register a pin controller device | |
491 | * @pctldesc: descriptor for this pin controller | |
492 | * @dev: parent device for this pin controller | |
493 | * @driver_data: private pin controller data for this pin controller | |
494 | */ | |
495 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
496 | struct device *dev, void *driver_data) | |
497 | { | |
498 | static atomic_t pinmux_no = ATOMIC_INIT(0); | |
499 | struct pinctrl_dev *pctldev; | |
500 | int ret; | |
501 | ||
502 | if (pctldesc == NULL) | |
503 | return NULL; | |
504 | if (pctldesc->name == NULL) | |
505 | return NULL; | |
506 | ||
507 | /* If we're implementing pinmuxing, check the ops for sanity */ | |
508 | if (pctldesc->pmxops) { | |
509 | ret = pinmux_check_ops(pctldesc->pmxops); | |
510 | if (ret) { | |
511 | pr_err("%s pinmux ops lacks necessary functions\n", | |
512 | pctldesc->name); | |
513 | return NULL; | |
514 | } | |
515 | } | |
516 | ||
517 | pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL); | |
518 | if (pctldev == NULL) | |
519 | return NULL; | |
520 | ||
521 | /* Initialize pin control device struct */ | |
522 | pctldev->owner = pctldesc->owner; | |
523 | pctldev->desc = pctldesc; | |
524 | pctldev->driver_data = driver_data; | |
525 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
526 | spin_lock_init(&pctldev->pin_desc_tree_lock); | |
527 | INIT_LIST_HEAD(&pctldev->gpio_ranges); | |
528 | mutex_init(&pctldev->gpio_ranges_lock); | |
529 | ||
530 | /* Register device */ | |
531 | pctldev->dev.parent = dev; | |
532 | dev_set_name(&pctldev->dev, "pinctrl.%d", | |
533 | atomic_inc_return(&pinmux_no) - 1); | |
534 | pctldev->dev.release = pinctrl_dev_release; | |
535 | ret = device_register(&pctldev->dev); | |
536 | if (ret != 0) { | |
537 | pr_err("error in device registration\n"); | |
538 | goto out_reg_dev_err; | |
539 | } | |
540 | dev_set_drvdata(&pctldev->dev, pctldev); | |
541 | ||
542 | /* Register all the pins */ | |
543 | pr_debug("try to register %d pins on %s...\n", | |
544 | pctldesc->npins, pctldesc->name); | |
545 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); | |
546 | if (ret) { | |
547 | pr_err("error during pin registration\n"); | |
548 | pinctrl_free_pindescs(pctldev, pctldesc->pins, | |
549 | pctldesc->npins); | |
550 | goto out_reg_pins_err; | |
551 | } | |
552 | ||
553 | pinctrl_init_device_debugfs(pctldev); | |
554 | mutex_lock(&pinctrldev_list_mutex); | |
555 | list_add(&pctldev->node, &pinctrldev_list); | |
556 | mutex_unlock(&pinctrldev_list_mutex); | |
557 | pinmux_hog_maps(pctldev); | |
558 | return pctldev; | |
559 | ||
560 | out_reg_pins_err: | |
561 | device_del(&pctldev->dev); | |
562 | out_reg_dev_err: | |
563 | put_device(&pctldev->dev); | |
564 | return NULL; | |
565 | } | |
566 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
567 | ||
568 | /** | |
569 | * pinctrl_unregister() - unregister pinmux | |
570 | * @pctldev: pin controller to unregister | |
571 | * | |
572 | * Called by pinmux drivers to unregister a pinmux. | |
573 | */ | |
574 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
575 | { | |
576 | if (pctldev == NULL) | |
577 | return; | |
578 | ||
579 | pinmux_unhog_maps(pctldev); | |
580 | /* TODO: check that no pinmuxes are still active? */ | |
581 | mutex_lock(&pinctrldev_list_mutex); | |
582 | list_del(&pctldev->node); | |
583 | mutex_unlock(&pinctrldev_list_mutex); | |
584 | /* Destroy descriptor tree */ | |
585 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
586 | pctldev->desc->npins); | |
587 | device_unregister(&pctldev->dev); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
590 | ||
591 | static int __init pinctrl_init(void) | |
592 | { | |
593 | pr_info("initialized pinctrl subsystem\n"); | |
594 | pinctrl_init_debugfs(); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | /* init early since many drivers really need to initialized pinmux early */ | |
599 | core_initcall(pinctrl_init); |