2 * omap_device implementation
4 * Copyright (C) 2009-2010 Nokia Corporation
5 * Paul Walmsley, Kevin Hilman
7 * Developed in collaboration with (alphabetical order): Benoit
8 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
9 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
16 * This code provides a consistent interface for OMAP device drivers
17 * to control power management and interconnect properties of their
20 * In the medium- to long-term, this code should either be
21 * a) implemented via arch-specific pointers in platform_data
23 * b) implemented as a proper omap_bus/omap_device in Linux, no more
24 * platform_data func pointers
27 * Guidelines for usage by driver authors:
29 * 1. These functions are intended to be used by device drivers via
30 * function pointers in struct platform_data. As an example,
31 * omap_device_enable() should be passed to the driver as
33 * struct foo_driver_platform_data {
35 * int (*device_enable)(struct platform_device *pdev);
39 * Note that the generic "device_enable" name is used, rather than
40 * "omap_device_enable". This is so other architectures can pass in their
41 * own enable/disable functions here.
43 * This should be populated during device setup:
46 * pdata->device_enable = omap_device_enable;
49 * 2. Drivers should first check to ensure the function pointer is not null
50 * before calling it, as in:
52 * if (pdata->device_enable)
53 * pdata->device_enable(pdev);
55 * This allows other architectures that don't use similar device_enable()/
56 * device_shutdown() functions to execute normally.
60 * Suggested usage by device drivers:
62 * During device initialization:
66 * (save remaining device context if necessary)
69 * During device resume:
71 * (restore context if necessary)
73 * During device shutdown:
75 * (device must be reinitialized at this point to use it again)
80 #include <linux/kernel.h>
81 #include <linux/platform_device.h>
82 #include <linux/slab.h>
83 #include <linux/err.h>
85 #include <linux/clk.h>
86 #include <linux/clkdev.h>
87 #include <linux/pm_runtime.h>
89 #include <plat/omap_device.h>
90 #include <plat/omap_hwmod.h>
91 #include <plat/clock.h>
93 /* These parameters are passed to _omap_device_{de,}activate() */
94 #define USE_WAKEUP_LAT 0
95 #define IGNORE_WAKEUP_LAT 1
97 /* Private functions */
100 * _omap_device_activate - increase device readiness
101 * @od: struct omap_device *
102 * @ignore_lat: increase to latency target (0) or full readiness (1)?
104 * Increase readiness of omap_device @od (thus decreasing device
105 * wakeup latency, but consuming more power). If @ignore_lat is
106 * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
107 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
108 * latency is greater than the requested maximum wakeup latency, step
109 * backwards in the omap_device_pm_latency table to ensure the
110 * device's maximum wakeup latency is less than or equal to the
111 * requested maximum wakeup latency. Returns 0.
113 static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
115 struct timespec a, b, c;
117 pr_debug("omap_device: %s: activating\n", od->pdev.name);
119 while (od->pm_lat_level > 0) {
120 struct omap_device_pm_latency *odpl;
121 unsigned long long act_lat = 0;
125 odpl = od->pm_lats + od->pm_lat_level;
128 (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
131 read_persistent_clock(&a);
133 /* XXX check return code */
134 odpl->activate_func(od);
136 read_persistent_clock(&b);
138 c = timespec_sub(b, a);
139 act_lat = timespec_to_ns(&c);
141 pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
142 "%llu nsec\n", od->pdev.name, od->pm_lat_level,
145 if (act_lat > odpl->activate_lat) {
146 odpl->activate_lat_worst = act_lat;
147 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
148 odpl->activate_lat = act_lat;
149 pr_warning("omap_device: %s.%d: new worst case "
150 "activate latency %d: %llu\n",
151 od->pdev.name, od->pdev.id,
152 od->pm_lat_level, act_lat);
154 pr_warning("omap_device: %s.%d: activate "
155 "latency %d higher than exptected. "
157 od->pdev.name, od->pdev.id,
158 od->pm_lat_level, act_lat,
162 od->dev_wakeup_lat -= odpl->activate_lat;
169 * _omap_device_deactivate - decrease device readiness
170 * @od: struct omap_device *
171 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
173 * Decrease readiness of omap_device @od (thus increasing device
174 * wakeup latency, but conserving power). If @ignore_lat is
175 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
176 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
177 * latency is less than the requested maximum wakeup latency, step
178 * forwards in the omap_device_pm_latency table to ensure the device's
179 * maximum wakeup latency is less than or equal to the requested
180 * maximum wakeup latency. Returns 0.
182 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
184 struct timespec a, b, c;
186 pr_debug("omap_device: %s: deactivating\n", od->pdev.name);
188 while (od->pm_lat_level < od->pm_lats_cnt) {
189 struct omap_device_pm_latency *odpl;
190 unsigned long long deact_lat = 0;
192 odpl = od->pm_lats + od->pm_lat_level;
195 ((od->dev_wakeup_lat + odpl->activate_lat) >
196 od->_dev_wakeup_lat_limit))
199 read_persistent_clock(&a);
201 /* XXX check return code */
202 odpl->deactivate_func(od);
204 read_persistent_clock(&b);
206 c = timespec_sub(b, a);
207 deact_lat = timespec_to_ns(&c);
209 pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
210 "%llu nsec\n", od->pdev.name, od->pm_lat_level,
213 if (deact_lat > odpl->deactivate_lat) {
214 odpl->deactivate_lat_worst = deact_lat;
215 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
216 odpl->deactivate_lat = deact_lat;
217 pr_warning("omap_device: %s.%d: new worst case "
218 "deactivate latency %d: %llu\n",
219 od->pdev.name, od->pdev.id,
220 od->pm_lat_level, deact_lat);
222 pr_warning("omap_device: %s.%d: deactivate "
223 "latency %d higher than exptected. "
225 od->pdev.name, od->pdev.id,
226 od->pm_lat_level, deact_lat,
227 odpl->deactivate_lat);
231 od->dev_wakeup_lat += odpl->activate_lat;
240 * _add_optional_clock_clkdev - Add clkdev entry for hwmod optional clocks
241 * @od: struct omap_device *od
243 * For every optional clock present per hwmod per omap_device, this function
244 * adds an entry in the clkdev table of the form <dev-id=dev_name, con-id=role>
245 * if it does not exist already.
247 * The function is called from inside omap_device_build_ss(), after
248 * omap_device_register.
250 * This allows drivers to get a pointer to its optional clocks based on its role
251 * by calling clk_get(<dev*>, <role>).
255 static void _add_optional_clock_clkdev(struct omap_device *od,
256 struct omap_hwmod *oh)
260 for (i = 0; i < oh->opt_clks_cnt; i++) {
261 struct omap_hwmod_opt_clk *oc;
263 struct clk_lookup *l;
265 oc = &oh->opt_clks[i];
270 r = clk_get_sys(dev_name(&od->pdev.dev), oc->role);
272 continue; /* clkdev entry exists */
274 r = omap_clk_get_by_name((char *)oc->clk);
276 pr_err("omap_device: %s: omap_clk_get_by_name for %s failed\n",
277 dev_name(&od->pdev.dev), oc->clk);
281 l = clkdev_alloc(r, oc->role, dev_name(&od->pdev.dev));
283 pr_err("omap_device: %s: clkdev_alloc for %s failed\n",
284 dev_name(&od->pdev.dev), oc->role);
292 /* Public functions for use by core code */
295 * omap_device_get_context_loss_count - get lost context count
296 * @od: struct omap_device *
298 * Using the primary hwmod, query the context loss count for this
301 * Callers should consider context for this device lost any time this
302 * function returns a value different than the value the caller got
303 * the last time it called this function.
305 * If any hwmods exist for the omap_device assoiated with @pdev,
306 * return the context loss counter for that hwmod, otherwise return
309 u32 omap_device_get_context_loss_count(struct platform_device *pdev)
311 struct omap_device *od;
314 od = to_omap_device(pdev);
317 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
323 * omap_device_count_resources - count number of struct resource entries needed
324 * @od: struct omap_device *
326 * Count the number of struct resource entries needed for this
327 * omap_device @od. Used by omap_device_build_ss() to determine how
328 * much memory to allocate before calling
329 * omap_device_fill_resources(). Returns the count.
331 int omap_device_count_resources(struct omap_device *od)
336 for (i = 0; i < od->hwmods_cnt; i++)
337 c += omap_hwmod_count_resources(od->hwmods[i]);
339 pr_debug("omap_device: %s: counted %d total resources across %d "
340 "hwmods\n", od->pdev.name, c, od->hwmods_cnt);
346 * omap_device_fill_resources - fill in array of struct resource
347 * @od: struct omap_device *
348 * @res: pointer to an array of struct resource to be filled in
350 * Populate one or more empty struct resource pointed to by @res with
351 * the resource data for this omap_device @od. Used by
352 * omap_device_build_ss() after calling omap_device_count_resources().
353 * Ideally this function would not be needed at all. If omap_device
354 * replaces platform_device, then we can specify our own
355 * get_resource()/ get_irq()/etc functions that use the underlying
356 * omap_hwmod information. Or if platform_device is extended to use
357 * subarchitecture-specific function pointers, the various
358 * platform_device functions can simply call omap_device internal
359 * functions to get device resources. Hacking around the existing
360 * platform_device code wastes memory. Returns 0.
362 int omap_device_fill_resources(struct omap_device *od, struct resource *res)
367 for (i = 0; i < od->hwmods_cnt; i++) {
368 r = omap_hwmod_fill_resources(od->hwmods[i], res);
377 * omap_device_build - build and register an omap_device with one omap_hwmod
378 * @pdev_name: name of the platform_device driver to use
379 * @pdev_id: this platform_device's connection ID
380 * @oh: ptr to the single omap_hwmod that backs this omap_device
381 * @pdata: platform_data ptr to associate with the platform_device
382 * @pdata_len: amount of memory pointed to by @pdata
383 * @pm_lats: pointer to a omap_device_pm_latency array for this device
384 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
385 * @is_early_device: should the device be registered as an early device or not
387 * Convenience function for building and registering a single
388 * omap_device record, which in turn builds and registers a
389 * platform_device record. See omap_device_build_ss() for more
390 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
391 * passes along the return value of omap_device_build_ss().
393 struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
394 struct omap_hwmod *oh, void *pdata,
396 struct omap_device_pm_latency *pm_lats,
397 int pm_lats_cnt, int is_early_device)
399 struct omap_hwmod *ohs[] = { oh };
402 return ERR_PTR(-EINVAL);
404 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
405 pdata_len, pm_lats, pm_lats_cnt,
410 * omap_device_build_ss - build and register an omap_device with multiple hwmods
411 * @pdev_name: name of the platform_device driver to use
412 * @pdev_id: this platform_device's connection ID
413 * @oh: ptr to the single omap_hwmod that backs this omap_device
414 * @pdata: platform_data ptr to associate with the platform_device
415 * @pdata_len: amount of memory pointed to by @pdata
416 * @pm_lats: pointer to a omap_device_pm_latency array for this device
417 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
418 * @is_early_device: should the device be registered as an early device or not
420 * Convenience function for building and registering an omap_device
421 * subsystem record. Subsystem records consist of multiple
422 * omap_hwmods. This function in turn builds and registers a
423 * platform_device record. Returns an ERR_PTR() on error, or passes
424 * along the return value of omap_device_register().
426 struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
427 struct omap_hwmod **ohs, int oh_cnt,
428 void *pdata, int pdata_len,
429 struct omap_device_pm_latency *pm_lats,
430 int pm_lats_cnt, int is_early_device)
433 struct omap_device *od;
435 struct resource *res = NULL;
437 struct omap_hwmod **hwmods;
439 if (!ohs || oh_cnt == 0 || !pdev_name)
440 return ERR_PTR(-EINVAL);
442 if (!pdata && pdata_len > 0)
443 return ERR_PTR(-EINVAL);
445 pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
448 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
450 return ERR_PTR(-ENOMEM);
452 od->hwmods_cnt = oh_cnt;
454 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
459 memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
462 pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
465 strcpy(pdev_name2, pdev_name);
467 od->pdev.name = pdev_name2;
468 od->pdev.id = pdev_id;
470 res_count = omap_device_count_resources(od);
472 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
476 omap_device_fill_resources(od, res);
478 od->pdev.num_resources = res_count;
479 od->pdev.resource = res;
481 ret = platform_device_add_data(&od->pdev, pdata, pdata_len);
485 od->pm_lats = pm_lats;
486 od->pm_lats_cnt = pm_lats_cnt;
489 ret = omap_early_device_register(od);
491 ret = omap_device_register(od);
493 for (i = 0; i < oh_cnt; i++) {
495 _add_optional_clock_clkdev(od, hwmods[i]);
512 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
518 * omap_early_device_register - register an omap_device as an early platform
520 * @od: struct omap_device * to register
522 * Register the omap_device structure. This currently just calls
523 * platform_early_add_device() on the underlying platform_device.
524 * Returns 0 by default.
526 int omap_early_device_register(struct omap_device *od)
528 struct platform_device *devices[1];
530 devices[0] = &(od->pdev);
531 early_platform_add_devices(devices, 1);
535 #ifdef CONFIG_PM_RUNTIME
536 static int _od_runtime_suspend(struct device *dev)
538 struct platform_device *pdev = to_platform_device(dev);
541 ret = pm_generic_runtime_suspend(dev);
544 omap_device_idle(pdev);
549 static int _od_runtime_idle(struct device *dev)
551 return pm_generic_runtime_idle(dev);
554 static int _od_runtime_resume(struct device *dev)
556 struct platform_device *pdev = to_platform_device(dev);
558 omap_device_enable(pdev);
560 return pm_generic_runtime_resume(dev);
564 #ifdef CONFIG_SUSPEND
565 static int _od_suspend_noirq(struct device *dev)
567 struct platform_device *pdev = to_platform_device(dev);
568 struct omap_device *od = to_omap_device(pdev);
571 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
572 return pm_generic_suspend_noirq(dev);
574 ret = pm_generic_suspend_noirq(dev);
576 if (!ret && !pm_runtime_status_suspended(dev)) {
577 if (pm_generic_runtime_suspend(dev) == 0) {
578 omap_device_idle(pdev);
579 od->flags |= OMAP_DEVICE_SUSPENDED;
586 static int _od_resume_noirq(struct device *dev)
588 struct platform_device *pdev = to_platform_device(dev);
589 struct omap_device *od = to_omap_device(pdev);
591 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
592 return pm_generic_resume_noirq(dev);
594 if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
595 !pm_runtime_status_suspended(dev)) {
596 od->flags &= ~OMAP_DEVICE_SUSPENDED;
597 omap_device_enable(pdev);
598 pm_generic_runtime_resume(dev);
601 return pm_generic_resume_noirq(dev);
605 static struct dev_pm_domain omap_device_pm_domain = {
607 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
609 USE_PLATFORM_PM_SLEEP_OPS
610 SET_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq, _od_resume_noirq)
615 * omap_device_register - register an omap_device with one omap_hwmod
616 * @od: struct omap_device * to register
618 * Register the omap_device structure. This currently just calls
619 * platform_device_register() on the underlying platform_device.
620 * Returns the return value of platform_device_register().
622 int omap_device_register(struct omap_device *od)
624 pr_debug("omap_device: %s: registering\n", od->pdev.name);
626 od->pdev.dev.parent = &omap_device_parent;
627 od->pdev.dev.pm_domain = &omap_device_pm_domain;
628 return platform_device_register(&od->pdev);
632 /* Public functions for use by device drivers through struct platform_data */
635 * omap_device_enable - fully activate an omap_device
636 * @od: struct omap_device * to activate
638 * Do whatever is necessary for the hwmods underlying omap_device @od
639 * to be accessible and ready to operate. This generally involves
640 * enabling clocks, setting SYSCONFIG registers; and in the future may
641 * involve remuxing pins. Device drivers should call this function
642 * (through platform_data function pointers) where they would normally
643 * enable clocks, etc. Returns -EINVAL if called when the omap_device
644 * is already enabled, or passes along the return value of
645 * _omap_device_activate().
647 int omap_device_enable(struct platform_device *pdev)
650 struct omap_device *od;
652 od = to_omap_device(pdev);
654 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
655 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
656 od->pdev.name, od->pdev.id, __func__, od->_state);
660 /* Enable everything if we're enabling this device from scratch */
661 if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
662 od->pm_lat_level = od->pm_lats_cnt;
664 ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
666 od->dev_wakeup_lat = 0;
667 od->_dev_wakeup_lat_limit = UINT_MAX;
668 od->_state = OMAP_DEVICE_STATE_ENABLED;
674 * omap_device_idle - idle an omap_device
675 * @od: struct omap_device * to idle
677 * Idle omap_device @od by calling as many .deactivate_func() entries
678 * in the omap_device's pm_lats table as is possible without exceeding
679 * the device's maximum wakeup latency limit, pm_lat_limit. Device
680 * drivers should call this function (through platform_data function
681 * pointers) where they would normally disable clocks after operations
682 * complete, etc.. Returns -EINVAL if the omap_device is not
683 * currently enabled, or passes along the return value of
684 * _omap_device_deactivate().
686 int omap_device_idle(struct platform_device *pdev)
689 struct omap_device *od;
691 od = to_omap_device(pdev);
693 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
694 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
695 od->pdev.name, od->pdev.id, __func__, od->_state);
699 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
701 od->_state = OMAP_DEVICE_STATE_IDLE;
707 * omap_device_shutdown - shut down an omap_device
708 * @od: struct omap_device * to shut down
710 * Shut down omap_device @od by calling all .deactivate_func() entries
711 * in the omap_device's pm_lats table and then shutting down all of
712 * the underlying omap_hwmods. Used when a device is being "removed"
713 * or a device driver is being unloaded. Returns -EINVAL if the
714 * omap_device is not currently enabled or idle, or passes along the
715 * return value of _omap_device_deactivate().
717 int omap_device_shutdown(struct platform_device *pdev)
720 struct omap_device *od;
722 od = to_omap_device(pdev);
724 if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
725 od->_state != OMAP_DEVICE_STATE_IDLE) {
726 WARN(1, "omap_device: %s.%d: %s() called from invalid state %d\n",
727 od->pdev.name, od->pdev.id, __func__, od->_state);
731 ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
733 for (i = 0; i < od->hwmods_cnt; i++)
734 omap_hwmod_shutdown(od->hwmods[i]);
736 od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
742 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
743 * @od: struct omap_device *
745 * When a device's maximum wakeup latency limit changes, call some of
746 * the .activate_func or .deactivate_func function pointers in the
747 * omap_device's pm_lats array to ensure that the device's maximum
748 * wakeup latency is less than or equal to the new latency limit.
749 * Intended to be called by OMAP PM code whenever a device's maximum
750 * wakeup latency limit changes (e.g., via
751 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
752 * done (e.g., if the omap_device is not currently idle, or if the
753 * wakeup latency is already current with the new limit) or passes
754 * along the return value of _omap_device_deactivate() or
755 * _omap_device_activate().
757 int omap_device_align_pm_lat(struct platform_device *pdev,
758 u32 new_wakeup_lat_limit)
761 struct omap_device *od;
763 od = to_omap_device(pdev);
765 if (new_wakeup_lat_limit == od->dev_wakeup_lat)
768 od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
770 if (od->_state != OMAP_DEVICE_STATE_IDLE)
772 else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
773 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
774 else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
775 ret = _omap_device_activate(od, USE_WAKEUP_LAT);
781 * omap_device_get_pwrdm - return the powerdomain * associated with @od
782 * @od: struct omap_device *
784 * Return the powerdomain associated with the first underlying
785 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
786 * code. Returns NULL on error or a struct powerdomain * upon
789 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
792 * XXX Assumes that all omap_hwmod powerdomains are identical.
793 * This may not necessarily be true. There should be a sanity
794 * check in here to WARN() if any difference appears.
799 return omap_hwmod_get_pwrdm(od->hwmods[0]);
803 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
804 * @od: struct omap_device *
806 * Return the MPU's virtual address for the base of the hwmod, from
807 * the ioremap() that the hwmod code does. Only valid if there is one
808 * hwmod associated with this device. Returns NULL if there are zero
809 * or more than one hwmods associated with this omap_device;
810 * otherwise, passes along the return value from
811 * omap_hwmod_get_mpu_rt_va().
813 void __iomem *omap_device_get_rt_va(struct omap_device *od)
815 if (od->hwmods_cnt != 1)
818 return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
822 * Public functions intended for use in omap_device_pm_latency
823 * .activate_func and .deactivate_func function pointers
827 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
828 * @od: struct omap_device *od
830 * Enable all underlying hwmods. Returns 0.
832 int omap_device_enable_hwmods(struct omap_device *od)
836 for (i = 0; i < od->hwmods_cnt; i++)
837 omap_hwmod_enable(od->hwmods[i]);
839 /* XXX pass along return value here? */
844 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
845 * @od: struct omap_device *od
847 * Idle all underlying hwmods. Returns 0.
849 int omap_device_idle_hwmods(struct omap_device *od)
853 for (i = 0; i < od->hwmods_cnt; i++)
854 omap_hwmod_idle(od->hwmods[i]);
856 /* XXX pass along return value here? */
861 * omap_device_disable_clocks - disable all main and interface clocks
862 * @od: struct omap_device *od
864 * Disable the main functional clock and interface clock for all of the
865 * omap_hwmods associated with the omap_device. Returns 0.
867 int omap_device_disable_clocks(struct omap_device *od)
871 for (i = 0; i < od->hwmods_cnt; i++)
872 omap_hwmod_disable_clocks(od->hwmods[i]);
874 /* XXX pass along return value here? */
879 * omap_device_enable_clocks - enable all main and interface clocks
880 * @od: struct omap_device *od
882 * Enable the main functional clock and interface clock for all of the
883 * omap_hwmods associated with the omap_device. Returns 0.
885 int omap_device_enable_clocks(struct omap_device *od)
889 for (i = 0; i < od->hwmods_cnt; i++)
890 omap_hwmod_enable_clocks(od->hwmods[i]);
892 /* XXX pass along return value here? */
896 struct device omap_device_parent = {
898 .parent = &platform_bus,
901 static int __init omap_device_init(void)
903 return device_register(&omap_device_parent);
905 core_initcall(omap_device_init);