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 static int omap_device_register(struct platform_device *pdev);
98 static int omap_early_device_register(struct platform_device *pdev);
100 /* Private functions */
103 * _omap_device_activate - increase device readiness
104 * @od: struct omap_device *
105 * @ignore_lat: increase to latency target (0) or full readiness (1)?
107 * Increase readiness of omap_device @od (thus decreasing device
108 * wakeup latency, but consuming more power). If @ignore_lat is
109 * IGNORE_WAKEUP_LAT, make the omap_device fully active. Otherwise,
110 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
111 * latency is greater than the requested maximum wakeup latency, step
112 * backwards in the omap_device_pm_latency table to ensure the
113 * device's maximum wakeup latency is less than or equal to the
114 * requested maximum wakeup latency. Returns 0.
116 static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
118 struct timespec a, b, c;
120 dev_dbg(&od->pdev->dev, "omap_device: activating\n");
122 while (od->pm_lat_level > 0) {
123 struct omap_device_pm_latency *odpl;
124 unsigned long long act_lat = 0;
128 odpl = od->pm_lats + od->pm_lat_level;
131 (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
134 read_persistent_clock(&a);
136 /* XXX check return code */
137 odpl->activate_func(od);
139 read_persistent_clock(&b);
141 c = timespec_sub(b, a);
142 act_lat = timespec_to_ns(&c);
144 dev_dbg(&od->pdev->dev,
145 "omap_device: pm_lat %d: activate: elapsed time "
146 "%llu nsec\n", od->pm_lat_level, act_lat);
148 if (act_lat > odpl->activate_lat) {
149 odpl->activate_lat_worst = act_lat;
150 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
151 odpl->activate_lat = act_lat;
152 dev_dbg(&od->pdev->dev,
153 "new worst case activate latency "
155 od->pm_lat_level, act_lat);
157 dev_warn(&od->pdev->dev,
158 "activate latency %d "
159 "higher than exptected. (%llu > %d)\n",
160 od->pm_lat_level, act_lat,
164 od->dev_wakeup_lat -= odpl->activate_lat;
171 * _omap_device_deactivate - decrease device readiness
172 * @od: struct omap_device *
173 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
175 * Decrease readiness of omap_device @od (thus increasing device
176 * wakeup latency, but conserving power). If @ignore_lat is
177 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
178 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
179 * latency is less than the requested maximum wakeup latency, step
180 * forwards in the omap_device_pm_latency table to ensure the device's
181 * maximum wakeup latency is less than or equal to the requested
182 * maximum wakeup latency. Returns 0.
184 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
186 struct timespec a, b, c;
188 dev_dbg(&od->pdev->dev, "omap_device: deactivating\n");
190 while (od->pm_lat_level < od->pm_lats_cnt) {
191 struct omap_device_pm_latency *odpl;
192 unsigned long long deact_lat = 0;
194 odpl = od->pm_lats + od->pm_lat_level;
197 ((od->dev_wakeup_lat + odpl->activate_lat) >
198 od->_dev_wakeup_lat_limit))
201 read_persistent_clock(&a);
203 /* XXX check return code */
204 odpl->deactivate_func(od);
206 read_persistent_clock(&b);
208 c = timespec_sub(b, a);
209 deact_lat = timespec_to_ns(&c);
211 dev_dbg(&od->pdev->dev,
212 "omap_device: pm_lat %d: deactivate: elapsed time "
213 "%llu nsec\n", od->pm_lat_level, deact_lat);
215 if (deact_lat > odpl->deactivate_lat) {
216 odpl->deactivate_lat_worst = deact_lat;
217 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
218 odpl->deactivate_lat = deact_lat;
219 dev_dbg(&od->pdev->dev,
220 "new worst case deactivate latency "
222 od->pm_lat_level, deact_lat);
224 dev_warn(&od->pdev->dev,
225 "deactivate latency %d "
226 "higher than exptected. (%llu > %d)\n",
227 od->pm_lat_level, deact_lat,
228 odpl->deactivate_lat);
231 od->dev_wakeup_lat += odpl->activate_lat;
239 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
240 const char *clk_name)
243 struct clk_lookup *l;
245 if (!clk_alias || !clk_name)
248 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
250 r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
252 dev_warn(&od->pdev->dev,
253 "alias %s already exists\n", clk_alias);
258 r = omap_clk_get_by_name(clk_name);
260 dev_err(&od->pdev->dev,
261 "omap_clk_get_by_name for %s failed\n", clk_name);
265 l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
267 dev_err(&od->pdev->dev,
268 "clkdev_alloc for %s failed\n", clk_alias);
276 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
278 * @od: struct omap_device *od
279 * @oh: struct omap_hwmod *oh
281 * For the main clock and every optional clock present per hwmod per
282 * omap_device, this function adds an entry in the clkdev table of the
283 * form <dev-id=dev_name, con-id=role> if it does not exist already.
285 * The function is called from inside omap_device_build_ss(), after
286 * omap_device_register.
288 * This allows drivers to get a pointer to its optional clocks based on its role
289 * by calling clk_get(<dev*>, <role>).
290 * In the case of the main clock, a "fck" alias is used.
294 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
295 struct omap_hwmod *oh)
299 _add_clkdev(od, "fck", oh->main_clk);
301 for (i = 0; i < oh->opt_clks_cnt; i++)
302 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
306 /* Public functions for use by core code */
309 * omap_device_get_context_loss_count - get lost context count
310 * @od: struct omap_device *
312 * Using the primary hwmod, query the context loss count for this
315 * Callers should consider context for this device lost any time this
316 * function returns a value different than the value the caller got
317 * the last time it called this function.
319 * If any hwmods exist for the omap_device assoiated with @pdev,
320 * return the context loss counter for that hwmod, otherwise return
323 u32 omap_device_get_context_loss_count(struct platform_device *pdev)
325 struct omap_device *od;
328 od = to_omap_device(pdev);
331 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
337 * omap_device_count_resources - count number of struct resource entries needed
338 * @od: struct omap_device *
340 * Count the number of struct resource entries needed for this
341 * omap_device @od. Used by omap_device_build_ss() to determine how
342 * much memory to allocate before calling
343 * omap_device_fill_resources(). Returns the count.
345 static int omap_device_count_resources(struct omap_device *od)
350 for (i = 0; i < od->hwmods_cnt; i++)
351 c += omap_hwmod_count_resources(od->hwmods[i]);
353 pr_debug("omap_device: %s: counted %d total resources across %d "
354 "hwmods\n", od->pdev->name, c, od->hwmods_cnt);
360 * omap_device_fill_resources - fill in array of struct resource
361 * @od: struct omap_device *
362 * @res: pointer to an array of struct resource to be filled in
364 * Populate one or more empty struct resource pointed to by @res with
365 * the resource data for this omap_device @od. Used by
366 * omap_device_build_ss() after calling omap_device_count_resources().
367 * Ideally this function would not be needed at all. If omap_device
368 * replaces platform_device, then we can specify our own
369 * get_resource()/ get_irq()/etc functions that use the underlying
370 * omap_hwmod information. Or if platform_device is extended to use
371 * subarchitecture-specific function pointers, the various
372 * platform_device functions can simply call omap_device internal
373 * functions to get device resources. Hacking around the existing
374 * platform_device code wastes memory. Returns 0.
376 static int omap_device_fill_resources(struct omap_device *od,
377 struct resource *res)
382 for (i = 0; i < od->hwmods_cnt; i++) {
383 r = omap_hwmod_fill_resources(od->hwmods[i], res);
392 * omap_device_build - build and register an omap_device with one omap_hwmod
393 * @pdev_name: name of the platform_device driver to use
394 * @pdev_id: this platform_device's connection ID
395 * @oh: ptr to the single omap_hwmod that backs this omap_device
396 * @pdata: platform_data ptr to associate with the platform_device
397 * @pdata_len: amount of memory pointed to by @pdata
398 * @pm_lats: pointer to a omap_device_pm_latency array for this device
399 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
400 * @is_early_device: should the device be registered as an early device or not
402 * Convenience function for building and registering a single
403 * omap_device record, which in turn builds and registers a
404 * platform_device record. See omap_device_build_ss() for more
405 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
406 * passes along the return value of omap_device_build_ss().
408 struct platform_device *omap_device_build(const char *pdev_name, int pdev_id,
409 struct omap_hwmod *oh, void *pdata,
411 struct omap_device_pm_latency *pm_lats,
412 int pm_lats_cnt, int is_early_device)
414 struct omap_hwmod *ohs[] = { oh };
417 return ERR_PTR(-EINVAL);
419 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
420 pdata_len, pm_lats, pm_lats_cnt,
425 * omap_device_build_ss - build and register an omap_device with multiple hwmods
426 * @pdev_name: name of the platform_device driver to use
427 * @pdev_id: this platform_device's connection ID
428 * @oh: ptr to the single omap_hwmod that backs this omap_device
429 * @pdata: platform_data ptr to associate with the platform_device
430 * @pdata_len: amount of memory pointed to by @pdata
431 * @pm_lats: pointer to a omap_device_pm_latency array for this device
432 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
433 * @is_early_device: should the device be registered as an early device or not
435 * Convenience function for building and registering an omap_device
436 * subsystem record. Subsystem records consist of multiple
437 * omap_hwmods. This function in turn builds and registers a
438 * platform_device record. Returns an ERR_PTR() on error, or passes
439 * along the return value of omap_device_register().
441 struct platform_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
442 struct omap_hwmod **ohs, int oh_cnt,
443 void *pdata, int pdata_len,
444 struct omap_device_pm_latency *pm_lats,
445 int pm_lats_cnt, int is_early_device)
448 struct platform_device *pdev;
449 struct omap_device *od;
450 struct resource *res = NULL;
452 struct omap_hwmod **hwmods;
454 if (!ohs || oh_cnt == 0 || !pdev_name)
455 return ERR_PTR(-EINVAL);
457 if (!pdata && pdata_len > 0)
458 return ERR_PTR(-EINVAL);
460 pdev = platform_device_alloc(pdev_name, pdev_id);
466 pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
469 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
474 od->hwmods_cnt = oh_cnt;
476 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
481 memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
485 res_count = omap_device_count_resources(od);
487 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
491 omap_device_fill_resources(od, res);
493 ret = platform_device_add_resources(pdev, res, res_count);
500 ret = platform_device_add_data(pdev, pdata, pdata_len);
504 pdev->archdata.od = od;
507 ret = omap_early_device_register(pdev);
509 ret = omap_device_register(pdev);
513 od->pm_lats = pm_lats;
514 od->pm_lats_cnt = pm_lats_cnt;
516 for (i = 0; i < oh_cnt; i++) {
518 _add_hwmod_clocks_clkdev(od, hwmods[i]);
528 platform_device_put(pdev);
531 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
537 * omap_early_device_register - register an omap_device as an early platform
539 * @od: struct omap_device * to register
541 * Register the omap_device structure. This currently just calls
542 * platform_early_add_device() on the underlying platform_device.
543 * Returns 0 by default.
545 static int omap_early_device_register(struct platform_device *pdev)
547 struct platform_device *devices[1];
550 early_platform_add_devices(devices, 1);
554 #ifdef CONFIG_PM_RUNTIME
555 static int _od_runtime_suspend(struct device *dev)
557 struct platform_device *pdev = to_platform_device(dev);
560 ret = pm_generic_runtime_suspend(dev);
563 omap_device_idle(pdev);
568 static int _od_runtime_idle(struct device *dev)
570 return pm_generic_runtime_idle(dev);
573 static int _od_runtime_resume(struct device *dev)
575 struct platform_device *pdev = to_platform_device(dev);
577 omap_device_enable(pdev);
579 return pm_generic_runtime_resume(dev);
583 #ifdef CONFIG_SUSPEND
584 static int _od_suspend_noirq(struct device *dev)
586 struct platform_device *pdev = to_platform_device(dev);
587 struct omap_device *od = to_omap_device(pdev);
590 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
591 return pm_generic_suspend_noirq(dev);
593 ret = pm_generic_suspend_noirq(dev);
595 if (!ret && !pm_runtime_status_suspended(dev)) {
596 if (pm_generic_runtime_suspend(dev) == 0) {
597 omap_device_idle(pdev);
598 od->flags |= OMAP_DEVICE_SUSPENDED;
605 static int _od_resume_noirq(struct device *dev)
607 struct platform_device *pdev = to_platform_device(dev);
608 struct omap_device *od = to_omap_device(pdev);
610 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
611 return pm_generic_resume_noirq(dev);
613 if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
614 !pm_runtime_status_suspended(dev)) {
615 od->flags &= ~OMAP_DEVICE_SUSPENDED;
616 omap_device_enable(pdev);
617 pm_generic_runtime_resume(dev);
620 return pm_generic_resume_noirq(dev);
623 #define _od_suspend_noirq NULL
624 #define _od_resume_noirq NULL
627 static struct dev_pm_domain omap_device_pm_domain = {
629 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
631 USE_PLATFORM_PM_SLEEP_OPS
632 .suspend_noirq = _od_suspend_noirq,
633 .resume_noirq = _od_resume_noirq,
638 * omap_device_register - register an omap_device with one omap_hwmod
639 * @od: struct omap_device * to register
641 * Register the omap_device structure. This currently just calls
642 * platform_device_register() on the underlying platform_device.
643 * Returns the return value of platform_device_register().
645 static int omap_device_register(struct platform_device *pdev)
647 pr_debug("omap_device: %s: registering\n", pdev->name);
649 pdev->dev.parent = &omap_device_parent;
650 pdev->dev.pm_domain = &omap_device_pm_domain;
651 return platform_device_add(pdev);
655 /* Public functions for use by device drivers through struct platform_data */
658 * omap_device_enable - fully activate an omap_device
659 * @od: struct omap_device * to activate
661 * Do whatever is necessary for the hwmods underlying omap_device @od
662 * to be accessible and ready to operate. This generally involves
663 * enabling clocks, setting SYSCONFIG registers; and in the future may
664 * involve remuxing pins. Device drivers should call this function
665 * (through platform_data function pointers) where they would normally
666 * enable clocks, etc. Returns -EINVAL if called when the omap_device
667 * is already enabled, or passes along the return value of
668 * _omap_device_activate().
670 int omap_device_enable(struct platform_device *pdev)
673 struct omap_device *od;
675 od = to_omap_device(pdev);
677 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
679 "omap_device: %s() called from invalid state %d\n",
680 __func__, od->_state);
684 /* Enable everything if we're enabling this device from scratch */
685 if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
686 od->pm_lat_level = od->pm_lats_cnt;
688 ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
690 od->dev_wakeup_lat = 0;
691 od->_dev_wakeup_lat_limit = UINT_MAX;
692 od->_state = OMAP_DEVICE_STATE_ENABLED;
698 * omap_device_idle - idle an omap_device
699 * @od: struct omap_device * to idle
701 * Idle omap_device @od by calling as many .deactivate_func() entries
702 * in the omap_device's pm_lats table as is possible without exceeding
703 * the device's maximum wakeup latency limit, pm_lat_limit. Device
704 * drivers should call this function (through platform_data function
705 * pointers) where they would normally disable clocks after operations
706 * complete, etc.. Returns -EINVAL if the omap_device is not
707 * currently enabled, or passes along the return value of
708 * _omap_device_deactivate().
710 int omap_device_idle(struct platform_device *pdev)
713 struct omap_device *od;
715 od = to_omap_device(pdev);
717 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
719 "omap_device: %s() called from invalid state %d\n",
720 __func__, od->_state);
724 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
726 od->_state = OMAP_DEVICE_STATE_IDLE;
732 * omap_device_shutdown - shut down an omap_device
733 * @od: struct omap_device * to shut down
735 * Shut down omap_device @od by calling all .deactivate_func() entries
736 * in the omap_device's pm_lats table and then shutting down all of
737 * the underlying omap_hwmods. Used when a device is being "removed"
738 * or a device driver is being unloaded. Returns -EINVAL if the
739 * omap_device is not currently enabled or idle, or passes along the
740 * return value of _omap_device_deactivate().
742 int omap_device_shutdown(struct platform_device *pdev)
745 struct omap_device *od;
747 od = to_omap_device(pdev);
749 if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
750 od->_state != OMAP_DEVICE_STATE_IDLE) {
752 "omap_device: %s() called from invalid state %d\n",
753 __func__, od->_state);
757 ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
759 for (i = 0; i < od->hwmods_cnt; i++)
760 omap_hwmod_shutdown(od->hwmods[i]);
762 od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
768 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
769 * @od: struct omap_device *
771 * When a device's maximum wakeup latency limit changes, call some of
772 * the .activate_func or .deactivate_func function pointers in the
773 * omap_device's pm_lats array to ensure that the device's maximum
774 * wakeup latency is less than or equal to the new latency limit.
775 * Intended to be called by OMAP PM code whenever a device's maximum
776 * wakeup latency limit changes (e.g., via
777 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
778 * done (e.g., if the omap_device is not currently idle, or if the
779 * wakeup latency is already current with the new limit) or passes
780 * along the return value of _omap_device_deactivate() or
781 * _omap_device_activate().
783 int omap_device_align_pm_lat(struct platform_device *pdev,
784 u32 new_wakeup_lat_limit)
787 struct omap_device *od;
789 od = to_omap_device(pdev);
791 if (new_wakeup_lat_limit == od->dev_wakeup_lat)
794 od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
796 if (od->_state != OMAP_DEVICE_STATE_IDLE)
798 else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
799 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
800 else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
801 ret = _omap_device_activate(od, USE_WAKEUP_LAT);
807 * omap_device_get_pwrdm - return the powerdomain * associated with @od
808 * @od: struct omap_device *
810 * Return the powerdomain associated with the first underlying
811 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
812 * code. Returns NULL on error or a struct powerdomain * upon
815 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
818 * XXX Assumes that all omap_hwmod powerdomains are identical.
819 * This may not necessarily be true. There should be a sanity
820 * check in here to WARN() if any difference appears.
825 return omap_hwmod_get_pwrdm(od->hwmods[0]);
829 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
830 * @od: struct omap_device *
832 * Return the MPU's virtual address for the base of the hwmod, from
833 * the ioremap() that the hwmod code does. Only valid if there is one
834 * hwmod associated with this device. Returns NULL if there are zero
835 * or more than one hwmods associated with this omap_device;
836 * otherwise, passes along the return value from
837 * omap_hwmod_get_mpu_rt_va().
839 void __iomem *omap_device_get_rt_va(struct omap_device *od)
841 if (od->hwmods_cnt != 1)
844 return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
848 * Public functions intended for use in omap_device_pm_latency
849 * .activate_func and .deactivate_func function pointers
853 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
854 * @od: struct omap_device *od
856 * Enable all underlying hwmods. Returns 0.
858 int omap_device_enable_hwmods(struct omap_device *od)
862 for (i = 0; i < od->hwmods_cnt; i++)
863 omap_hwmod_enable(od->hwmods[i]);
865 /* XXX pass along return value here? */
870 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
871 * @od: struct omap_device *od
873 * Idle all underlying hwmods. Returns 0.
875 int omap_device_idle_hwmods(struct omap_device *od)
879 for (i = 0; i < od->hwmods_cnt; i++)
880 omap_hwmod_idle(od->hwmods[i]);
882 /* XXX pass along return value here? */
887 * omap_device_disable_clocks - disable all main and interface clocks
888 * @od: struct omap_device *od
890 * Disable the main functional clock and interface clock for all of the
891 * omap_hwmods associated with the omap_device. Returns 0.
893 int omap_device_disable_clocks(struct omap_device *od)
897 for (i = 0; i < od->hwmods_cnt; i++)
898 omap_hwmod_disable_clocks(od->hwmods[i]);
900 /* XXX pass along return value here? */
905 * omap_device_enable_clocks - enable all main and interface clocks
906 * @od: struct omap_device *od
908 * Enable the main functional clock and interface clock for all of the
909 * omap_hwmods associated with the omap_device. Returns 0.
911 int omap_device_enable_clocks(struct omap_device *od)
915 for (i = 0; i < od->hwmods_cnt; i++)
916 omap_hwmod_enable_clocks(od->hwmods[i]);
918 /* XXX pass along return value here? */
922 struct device omap_device_parent = {
924 .parent = &platform_bus,
927 static int __init omap_device_init(void)
929 return device_register(&omap_device_parent);
931 core_initcall(omap_device_init);