1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * omap_device implementation
4  *
5  * Copyright (C) 2009-2010 Nokia Corporation
6  * Paul Walmsley, Kevin Hilman
7  *
8  * Developed in collaboration with (alphabetical order): Benoit
9  * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
10  * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
11  * Woodruff
12  *
13  * This code provides a consistent interface for OMAP device drivers
14  * to control power management and interconnect properties of their
15  * devices.
16  *
17  * In the medium- to long-term, this code should be implemented as a
18  * proper omap_bus/omap_device in Linux, no more platform_data func
19  * pointers
20  */
21 #undef DEBUG
22 
23 #include <linux/kernel.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/err.h>
27 #include <linux/io.h>
28 #include <linux/clk.h>
29 #include <linux/clkdev.h>
30 #include <linux/pm_domain.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/of.h>
33 #include <linux/of_address.h>
34 #include <linux/of_irq.h>
35 #include <linux/notifier.h>
36 
37 #include "common.h"
38 #include "soc.h"
39 #include "omap_device.h"
40 #include "omap_hwmod.h"
41 
42 /* Private functions */
43 
_add_clkdev(struct omap_device * od,const char * clk_alias,const char * clk_name)44 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
45 		       const char *clk_name)
46 {
47 	struct clk *r;
48 	int rc;
49 
50 	if (!clk_alias || !clk_name)
51 		return;
52 
53 	dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
54 
55 	r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
56 	if (!IS_ERR(r)) {
57 		dev_dbg(&od->pdev->dev,
58 			 "alias %s already exists\n", clk_alias);
59 		clk_put(r);
60 		return;
61 	}
62 
63 	r = clk_get_sys(NULL, clk_name);
64 
65 	if (IS_ERR(r)) {
66 		struct of_phandle_args clkspec;
67 
68 		clkspec.np = of_find_node_by_name(NULL, clk_name);
69 
70 		r = of_clk_get_from_provider(&clkspec);
71 
72 		rc = clk_register_clkdev(r, clk_alias,
73 					 dev_name(&od->pdev->dev));
74 	} else {
75 		rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev),
76 				   clk_name, NULL);
77 	}
78 
79 	if (rc) {
80 		if (rc == -ENODEV || rc == -ENOMEM)
81 			dev_err(&od->pdev->dev,
82 				"clkdev_alloc for %s failed\n", clk_alias);
83 		else
84 			dev_err(&od->pdev->dev,
85 				"clk_get for %s failed\n", clk_name);
86 	}
87 }
88 
89 /**
90  * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
91  * and main clock
92  * @od: struct omap_device *od
93  * @oh: struct omap_hwmod *oh
94  *
95  * For the main clock and every optional clock present per hwmod per
96  * omap_device, this function adds an entry in the clkdev table of the
97  * form <dev-id=dev_name, con-id=role> if it does not exist already.
98  *
99  * This allows drivers to get a pointer to its optional clocks based on its role
100  * by calling clk_get(<dev*>, <role>).
101  * In the case of the main clock, a "fck" alias is used.
102  *
103  * No return value.
104  */
_add_hwmod_clocks_clkdev(struct omap_device * od,struct omap_hwmod * oh)105 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
106 				     struct omap_hwmod *oh)
107 {
108 	int i;
109 
110 	_add_clkdev(od, "fck", oh->main_clk);
111 
112 	for (i = 0; i < oh->opt_clks_cnt; i++)
113 		_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
114 }
115 
116 
117 /**
118  * omap_device_build_from_dt - build an omap_device with multiple hwmods
119  * @pdev: The platform device to update.
120  *
121  * Function for building an omap_device already registered from device-tree
122  *
123  * Returns 0 or PTR_ERR() on error.
124  */
omap_device_build_from_dt(struct platform_device * pdev)125 static int omap_device_build_from_dt(struct platform_device *pdev)
126 {
127 	struct omap_hwmod **hwmods;
128 	struct omap_device *od;
129 	struct omap_hwmod *oh;
130 	struct device_node *node = pdev->dev.of_node;
131 	struct resource res;
132 	const char *oh_name;
133 	int oh_cnt, i, ret = 0;
134 	bool device_active = false, skip_pm_domain = false;
135 
136 	oh_cnt = of_property_count_strings(node, "ti,hwmods");
137 	if (oh_cnt <= 0) {
138 		dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
139 		return -ENODEV;
140 	}
141 
142 	/* SDMA still needs special handling for omap_device_build() */
143 	ret = of_property_read_string_index(node, "ti,hwmods", 0, &oh_name);
144 	if (!ret && (!strncmp("dma_system", oh_name, 10) ||
145 		     !strncmp("dma", oh_name, 3)))
146 		skip_pm_domain = true;
147 
148 	/* Use ti-sysc driver instead of omap_device? */
149 	if (!skip_pm_domain &&
150 	    !omap_hwmod_parse_module_range(NULL, node, &res))
151 		return -ENODEV;
152 
153 	hwmods = kcalloc(oh_cnt, sizeof(struct omap_hwmod *), GFP_KERNEL);
154 	if (!hwmods) {
155 		ret = -ENOMEM;
156 		goto odbfd_exit;
157 	}
158 
159 	for (i = 0; i < oh_cnt; i++) {
160 		of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
161 		oh = omap_hwmod_lookup(oh_name);
162 		if (!oh) {
163 			dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
164 				oh_name);
165 			ret = -EINVAL;
166 			goto odbfd_exit1;
167 		}
168 		hwmods[i] = oh;
169 		if (oh->flags & HWMOD_INIT_NO_IDLE)
170 			device_active = true;
171 	}
172 
173 	od = omap_device_alloc(pdev, hwmods, oh_cnt);
174 	if (IS_ERR(od)) {
175 		dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
176 			oh_name);
177 		ret = PTR_ERR(od);
178 		goto odbfd_exit1;
179 	}
180 
181 	/* Fix up missing resource names */
182 	for (i = 0; i < pdev->num_resources; i++) {
183 		struct resource *r = &pdev->resource[i];
184 
185 		if (r->name == NULL)
186 			r->name = dev_name(&pdev->dev);
187 	}
188 
189 	if (!skip_pm_domain) {
190 		dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
191 		if (device_active) {
192 			omap_device_enable(pdev);
193 			pm_runtime_set_active(&pdev->dev);
194 		}
195 	}
196 
197 odbfd_exit1:
198 	kfree(hwmods);
199 odbfd_exit:
200 	/* if data/we are at fault.. load up a fail handler */
201 	if (ret)
202 		dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
203 
204 	return ret;
205 }
206 
_omap_device_notifier_call(struct notifier_block * nb,unsigned long event,void * dev)207 static int _omap_device_notifier_call(struct notifier_block *nb,
208 				      unsigned long event, void *dev)
209 {
210 	struct platform_device *pdev = to_platform_device(dev);
211 	struct omap_device *od;
212 	int err;
213 
214 	switch (event) {
215 	case BUS_NOTIFY_REMOVED_DEVICE:
216 		if (pdev->archdata.od)
217 			omap_device_delete(pdev->archdata.od);
218 		break;
219 	case BUS_NOTIFY_UNBOUND_DRIVER:
220 		od = to_omap_device(pdev);
221 		if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
222 			dev_info(dev, "enabled after unload, idling\n");
223 			err = omap_device_idle(pdev);
224 			if (err)
225 				dev_err(dev, "failed to idle\n");
226 		}
227 		break;
228 	case BUS_NOTIFY_BIND_DRIVER:
229 		od = to_omap_device(pdev);
230 		if (od) {
231 			od->_driver_status = BUS_NOTIFY_BIND_DRIVER;
232 			if (od->_state == OMAP_DEVICE_STATE_ENABLED &&
233 			    pm_runtime_status_suspended(dev)) {
234 				pm_runtime_set_active(dev);
235 			}
236 		}
237 		break;
238 	case BUS_NOTIFY_ADD_DEVICE:
239 		if (pdev->dev.of_node)
240 			omap_device_build_from_dt(pdev);
241 		omap_auxdata_legacy_init(dev);
242 		fallthrough;
243 	default:
244 		od = to_omap_device(pdev);
245 		if (od)
246 			od->_driver_status = event;
247 	}
248 
249 	return NOTIFY_DONE;
250 }
251 
252 /**
253  * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
254  * @od: struct omap_device *od
255  *
256  * Enable all underlying hwmods.  Returns 0.
257  */
_omap_device_enable_hwmods(struct omap_device * od)258 static int _omap_device_enable_hwmods(struct omap_device *od)
259 {
260 	int ret = 0;
261 	int i;
262 
263 	for (i = 0; i < od->hwmods_cnt; i++)
264 		ret |= omap_hwmod_enable(od->hwmods[i]);
265 
266 	return ret;
267 }
268 
269 /**
270  * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
271  * @od: struct omap_device *od
272  *
273  * Idle all underlying hwmods.  Returns 0.
274  */
_omap_device_idle_hwmods(struct omap_device * od)275 static int _omap_device_idle_hwmods(struct omap_device *od)
276 {
277 	int ret = 0;
278 	int i;
279 
280 	for (i = 0; i < od->hwmods_cnt; i++)
281 		ret |= omap_hwmod_idle(od->hwmods[i]);
282 
283 	return ret;
284 }
285 
286 /* Public functions for use by core code */
287 
288 /**
289  * omap_device_get_context_loss_count - get lost context count
290  * @pdev: The platform device to update.
291  *
292  * Using the primary hwmod, query the context loss count for this
293  * device.
294  *
295  * Callers should consider context for this device lost any time this
296  * function returns a value different than the value the caller got
297  * the last time it called this function.
298  *
299  * If any hwmods exist for the omap_device associated with @pdev,
300  * return the context loss counter for that hwmod, otherwise return
301  * zero.
302  */
omap_device_get_context_loss_count(struct platform_device * pdev)303 int omap_device_get_context_loss_count(struct platform_device *pdev)
304 {
305 	struct omap_device *od;
306 	u32 ret = 0;
307 
308 	od = to_omap_device(pdev);
309 
310 	if (od->hwmods_cnt)
311 		ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
312 
313 	return ret;
314 }
315 
316 /**
317  * omap_device_alloc - allocate an omap_device
318  * @pdev: platform_device that will be included in this omap_device
319  * @ohs: ptr to the omap_hwmod for this omap_device
320  * @oh_cnt: the size of the ohs list
321  *
322  * Convenience function for allocating an omap_device structure and filling
323  * hwmods, and resources.
324  *
325  * Returns an struct omap_device pointer or ERR_PTR() on error;
326  */
omap_device_alloc(struct platform_device * pdev,struct omap_hwmod ** ohs,int oh_cnt)327 struct omap_device *omap_device_alloc(struct platform_device *pdev,
328 					struct omap_hwmod **ohs, int oh_cnt)
329 {
330 	int ret = -ENOMEM;
331 	struct omap_device *od;
332 	int i;
333 	struct omap_hwmod **hwmods;
334 
335 	od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
336 	if (!od)
337 		goto oda_exit1;
338 
339 	od->hwmods_cnt = oh_cnt;
340 
341 	hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
342 	if (!hwmods)
343 		goto oda_exit2;
344 
345 	od->hwmods = hwmods;
346 	od->pdev = pdev;
347 	pdev->archdata.od = od;
348 
349 	for (i = 0; i < oh_cnt; i++) {
350 		hwmods[i]->od = od;
351 		_add_hwmod_clocks_clkdev(od, hwmods[i]);
352 	}
353 
354 	return od;
355 
356 oda_exit2:
357 	kfree(od);
358 oda_exit1:
359 	dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
360 
361 	return ERR_PTR(ret);
362 }
363 
omap_device_delete(struct omap_device * od)364 void omap_device_delete(struct omap_device *od)
365 {
366 	if (!od)
367 		return;
368 
369 	od->pdev->archdata.od = NULL;
370 	kfree(od->hwmods);
371 	kfree(od);
372 }
373 
374 #ifdef CONFIG_PM
_od_runtime_suspend(struct device * dev)375 static int _od_runtime_suspend(struct device *dev)
376 {
377 	struct platform_device *pdev = to_platform_device(dev);
378 	int ret;
379 
380 	ret = pm_generic_runtime_suspend(dev);
381 	if (ret)
382 		return ret;
383 
384 	return omap_device_idle(pdev);
385 }
386 
_od_runtime_resume(struct device * dev)387 static int _od_runtime_resume(struct device *dev)
388 {
389 	struct platform_device *pdev = to_platform_device(dev);
390 	int ret;
391 
392 	ret = omap_device_enable(pdev);
393 	if (ret) {
394 		dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
395 		return ret;
396 	}
397 
398 	return pm_generic_runtime_resume(dev);
399 }
400 
_od_fail_runtime_suspend(struct device * dev)401 static int _od_fail_runtime_suspend(struct device *dev)
402 {
403 	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
404 	return -ENODEV;
405 }
406 
_od_fail_runtime_resume(struct device * dev)407 static int _od_fail_runtime_resume(struct device *dev)
408 {
409 	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
410 	return -ENODEV;
411 }
412 
413 #endif
414 
415 #ifdef CONFIG_SUSPEND
_od_suspend_noirq(struct device * dev)416 static int _od_suspend_noirq(struct device *dev)
417 {
418 	struct platform_device *pdev = to_platform_device(dev);
419 	struct omap_device *od = to_omap_device(pdev);
420 	int ret;
421 
422 	/* Don't attempt late suspend on a driver that is not bound */
423 	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
424 		return 0;
425 
426 	ret = pm_generic_suspend_noirq(dev);
427 
428 	if (!ret && !pm_runtime_status_suspended(dev)) {
429 		if (pm_generic_runtime_suspend(dev) == 0) {
430 			omap_device_idle(pdev);
431 			od->flags |= OMAP_DEVICE_SUSPENDED;
432 		}
433 	}
434 
435 	return ret;
436 }
437 
_od_resume_noirq(struct device * dev)438 static int _od_resume_noirq(struct device *dev)
439 {
440 	struct platform_device *pdev = to_platform_device(dev);
441 	struct omap_device *od = to_omap_device(pdev);
442 
443 	if (od->flags & OMAP_DEVICE_SUSPENDED) {
444 		od->flags &= ~OMAP_DEVICE_SUSPENDED;
445 		omap_device_enable(pdev);
446 		pm_generic_runtime_resume(dev);
447 	}
448 
449 	return pm_generic_resume_noirq(dev);
450 }
451 #else
452 #define _od_suspend_noirq NULL
453 #define _od_resume_noirq NULL
454 #endif
455 
456 struct dev_pm_domain omap_device_fail_pm_domain = {
457 	.ops = {
458 		SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
459 				   _od_fail_runtime_resume, NULL)
460 	}
461 };
462 
463 struct dev_pm_domain omap_device_pm_domain = {
464 	.ops = {
465 		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
466 				   NULL)
467 		USE_PLATFORM_PM_SLEEP_OPS
468 		SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
469 					      _od_resume_noirq)
470 	}
471 };
472 
473 /* Public functions for use by device drivers through struct platform_data */
474 
475 /**
476  * omap_device_enable - fully activate an omap_device
477  * @pdev: the platform device to activate
478  *
479  * Do whatever is necessary for the hwmods underlying omap_device @od
480  * to be accessible and ready to operate.  This generally involves
481  * enabling clocks, setting SYSCONFIG registers; and in the future may
482  * involve remuxing pins.  Device drivers should call this function
483  * indirectly via pm_runtime_get*().  Returns -EINVAL if called when
484  * the omap_device is already enabled, or passes along the return
485  * value of _omap_device_enable_hwmods().
486  */
omap_device_enable(struct platform_device * pdev)487 int omap_device_enable(struct platform_device *pdev)
488 {
489 	int ret;
490 	struct omap_device *od;
491 
492 	od = to_omap_device(pdev);
493 
494 	if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
495 		dev_warn(&pdev->dev,
496 			 "omap_device: %s() called from invalid state %d\n",
497 			 __func__, od->_state);
498 		return -EINVAL;
499 	}
500 
501 	ret = _omap_device_enable_hwmods(od);
502 
503 	if (ret == 0)
504 		od->_state = OMAP_DEVICE_STATE_ENABLED;
505 
506 	return ret;
507 }
508 
509 /**
510  * omap_device_idle - idle an omap_device
511  * @pdev: The platform_device (omap_device) to idle
512  *
513  * Idle omap_device @od.  Device drivers call this function indirectly
514  * via pm_runtime_put*().  Returns -EINVAL if the omap_device is not
515  * currently enabled, or passes along the return value of
516  * _omap_device_idle_hwmods().
517  */
omap_device_idle(struct platform_device * pdev)518 int omap_device_idle(struct platform_device *pdev)
519 {
520 	int ret;
521 	struct omap_device *od;
522 
523 	od = to_omap_device(pdev);
524 
525 	if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
526 		dev_warn(&pdev->dev,
527 			 "omap_device: %s() called from invalid state %d\n",
528 			 __func__, od->_state);
529 		return -EINVAL;
530 	}
531 
532 	ret = _omap_device_idle_hwmods(od);
533 
534 	if (ret == 0)
535 		od->_state = OMAP_DEVICE_STATE_IDLE;
536 
537 	return ret;
538 }
539 
540 /**
541  * omap_device_assert_hardreset - set a device's hardreset line
542  * @pdev: struct platform_device * to reset
543  * @name: const char * name of the reset line
544  *
545  * Set the hardreset line identified by @name on the IP blocks
546  * associated with the hwmods backing the platform_device @pdev.  All
547  * of the hwmods associated with @pdev must have the same hardreset
548  * line linked to them for this to work.  Passes along the return value
549  * of omap_hwmod_assert_hardreset() in the event of any failure, or
550  * returns 0 upon success.
551  */
omap_device_assert_hardreset(struct platform_device * pdev,const char * name)552 int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
553 {
554 	struct omap_device *od = to_omap_device(pdev);
555 	int ret = 0;
556 	int i;
557 
558 	for (i = 0; i < od->hwmods_cnt; i++) {
559 		ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
560 		if (ret)
561 			break;
562 	}
563 
564 	return ret;
565 }
566 
567 /**
568  * omap_device_deassert_hardreset - release a device's hardreset line
569  * @pdev: struct platform_device * to reset
570  * @name: const char * name of the reset line
571  *
572  * Release the hardreset line identified by @name on the IP blocks
573  * associated with the hwmods backing the platform_device @pdev.  All
574  * of the hwmods associated with @pdev must have the same hardreset
575  * line linked to them for this to work.  Passes along the return
576  * value of omap_hwmod_deassert_hardreset() in the event of any
577  * failure, or returns 0 upon success.
578  */
omap_device_deassert_hardreset(struct platform_device * pdev,const char * name)579 int omap_device_deassert_hardreset(struct platform_device *pdev,
580 				   const char *name)
581 {
582 	struct omap_device *od = to_omap_device(pdev);
583 	int ret = 0;
584 	int i;
585 
586 	for (i = 0; i < od->hwmods_cnt; i++) {
587 		ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
588 		if (ret)
589 			break;
590 	}
591 
592 	return ret;
593 }
594 
595 /**
596  * omap_device_get_by_hwmod_name() - convert a hwmod name to
597  * device pointer.
598  * @oh_name: name of the hwmod device
599  *
600  * Returns back a struct device * pointer associated with a hwmod
601  * device represented by a hwmod_name
602  */
omap_device_get_by_hwmod_name(const char * oh_name)603 struct device *omap_device_get_by_hwmod_name(const char *oh_name)
604 {
605 	struct omap_hwmod *oh;
606 
607 	if (!oh_name) {
608 		WARN(1, "%s: no hwmod name!\n", __func__);
609 		return ERR_PTR(-EINVAL);
610 	}
611 
612 	oh = omap_hwmod_lookup(oh_name);
613 	if (!oh) {
614 		WARN(1, "%s: no hwmod for %s\n", __func__,
615 			oh_name);
616 		return ERR_PTR(-ENODEV);
617 	}
618 	if (!oh->od) {
619 		WARN(1, "%s: no omap_device for %s\n", __func__,
620 			oh_name);
621 		return ERR_PTR(-ENODEV);
622 	}
623 
624 	return &oh->od->pdev->dev;
625 }
626 
627 static struct notifier_block platform_nb = {
628 	.notifier_call = _omap_device_notifier_call,
629 };
630 
omap_device_init(void)631 static int __init omap_device_init(void)
632 {
633 	bus_register_notifier(&platform_bus_type, &platform_nb);
634 	return 0;
635 }
636 omap_postcore_initcall(omap_device_init);
637 
638 /**
639  * omap_device_late_idle - idle devices without drivers
640  * @dev: struct device * associated with omap_device
641  * @data: unused
642  *
643  * Check the driver bound status of this device, and idle it
644  * if there is no driver attached.
645  */
omap_device_late_idle(struct device * dev,void * data)646 static int __init omap_device_late_idle(struct device *dev, void *data)
647 {
648 	struct platform_device *pdev = to_platform_device(dev);
649 	struct omap_device *od = to_omap_device(pdev);
650 	int i;
651 
652 	if (!od)
653 		return 0;
654 
655 	/*
656 	 * If omap_device state is enabled, but has no driver bound,
657 	 * idle it.
658 	 */
659 
660 	/*
661 	 * Some devices (like memory controllers) are always kept
662 	 * enabled, and should not be idled even with no drivers.
663 	 */
664 	for (i = 0; i < od->hwmods_cnt; i++)
665 		if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
666 			return 0;
667 
668 	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
669 	    od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
670 		if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
671 			dev_warn(dev, "%s: enabled but no driver.  Idling\n",
672 				 __func__);
673 			omap_device_idle(pdev);
674 		}
675 	}
676 
677 	return 0;
678 }
679 
omap_device_late_init(void)680 static int __init omap_device_late_init(void)
681 {
682 	bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
683 
684 	return 0;
685 }
686 omap_late_initcall_sync(omap_device_late_init);
687