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 dev_dbg(&od->pdev.dev, "omap_device: activating\n");
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 dev_dbg(&od->pdev.dev,
142 "omap_device: pm_lat %d: activate: elapsed time "
143 "%llu nsec\n", od->pm_lat_level, act_lat);
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 dev_dbg(&od->pdev.dev,
150 "new worst case activate latency "
152 od->pm_lat_level, act_lat);
154 dev_warn(&od->pdev.dev,
155 "activate latency %d "
156 "higher than exptected. (%llu > %d)\n",
157 od->pm_lat_level, act_lat,
161 od->dev_wakeup_lat -= odpl->activate_lat;
168 * _omap_device_deactivate - decrease device readiness
169 * @od: struct omap_device *
170 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
172 * Decrease readiness of omap_device @od (thus increasing device
173 * wakeup latency, but conserving power). If @ignore_lat is
174 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive. Otherwise,
175 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
176 * latency is less than the requested maximum wakeup latency, step
177 * forwards in the omap_device_pm_latency table to ensure the device's
178 * maximum wakeup latency is less than or equal to the requested
179 * maximum wakeup latency. Returns 0.
181 static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
183 struct timespec a, b, c;
185 dev_dbg(&od->pdev.dev, "omap_device: deactivating\n");
187 while (od->pm_lat_level < od->pm_lats_cnt) {
188 struct omap_device_pm_latency *odpl;
189 unsigned long long deact_lat = 0;
191 odpl = od->pm_lats + od->pm_lat_level;
194 ((od->dev_wakeup_lat + odpl->activate_lat) >
195 od->_dev_wakeup_lat_limit))
198 read_persistent_clock(&a);
200 /* XXX check return code */
201 odpl->deactivate_func(od);
203 read_persistent_clock(&b);
205 c = timespec_sub(b, a);
206 deact_lat = timespec_to_ns(&c);
208 dev_dbg(&od->pdev.dev,
209 "omap_device: pm_lat %d: deactivate: elapsed time "
210 "%llu nsec\n", od->pm_lat_level, deact_lat);
212 if (deact_lat > odpl->deactivate_lat) {
213 odpl->deactivate_lat_worst = deact_lat;
214 if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
215 odpl->deactivate_lat = deact_lat;
216 dev_dbg(&od->pdev.dev,
217 "new worst case deactivate latency "
219 od->pm_lat_level, deact_lat);
221 dev_warn(&od->pdev.dev,
222 "deactivate latency %d "
223 "higher than exptected. (%llu > %d)\n",
224 od->pm_lat_level, deact_lat,
225 odpl->deactivate_lat);
228 od->dev_wakeup_lat += odpl->activate_lat;
236 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
237 const char *clk_name)
240 struct clk_lookup *l;
242 if (!clk_alias || !clk_name)
245 dev_dbg(&od->pdev.dev, "Creating %s -> %s\n", clk_alias, clk_name);
247 r = clk_get_sys(dev_name(&od->pdev.dev), clk_alias);
249 dev_warn(&od->pdev.dev,
250 "alias %s already exists\n", clk_alias);
255 r = omap_clk_get_by_name(clk_name);
257 dev_err(&od->pdev.dev,
258 "omap_clk_get_by_name for %s failed\n", clk_name);
262 l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev.dev));
264 dev_err(&od->pdev.dev,
265 "clkdev_alloc for %s failed\n", clk_alias);
273 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
275 * @od: struct omap_device *od
276 * @oh: struct omap_hwmod *oh
278 * For the main clock and every optional clock present per hwmod per
279 * omap_device, this function adds an entry in the clkdev table of the
280 * form <dev-id=dev_name, con-id=role> if it does not exist already.
282 * The function is called from inside omap_device_build_ss(), after
283 * omap_device_register.
285 * This allows drivers to get a pointer to its optional clocks based on its role
286 * by calling clk_get(<dev*>, <role>).
287 * In the case of the main clock, a "fck" alias is used.
291 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
292 struct omap_hwmod *oh)
296 _add_clkdev(od, "fck", oh->main_clk);
298 for (i = 0; i < oh->opt_clks_cnt; i++)
299 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
303 /* Public functions for use by core code */
306 * omap_device_get_context_loss_count - get lost context count
307 * @od: struct omap_device *
309 * Using the primary hwmod, query the context loss count for this
312 * Callers should consider context for this device lost any time this
313 * function returns a value different than the value the caller got
314 * the last time it called this function.
316 * If any hwmods exist for the omap_device assoiated with @pdev,
317 * return the context loss counter for that hwmod, otherwise return
320 u32 omap_device_get_context_loss_count(struct platform_device *pdev)
322 struct omap_device *od;
325 od = to_omap_device(pdev);
328 ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
334 * omap_device_count_resources - count number of struct resource entries needed
335 * @od: struct omap_device *
337 * Count the number of struct resource entries needed for this
338 * omap_device @od. Used by omap_device_build_ss() to determine how
339 * much memory to allocate before calling
340 * omap_device_fill_resources(). Returns the count.
342 int omap_device_count_resources(struct omap_device *od)
347 for (i = 0; i < od->hwmods_cnt; i++)
348 c += omap_hwmod_count_resources(od->hwmods[i]);
350 pr_debug("omap_device: %s: counted %d total resources across %d "
351 "hwmods\n", od->pdev.name, c, od->hwmods_cnt);
357 * omap_device_fill_resources - fill in array of struct resource
358 * @od: struct omap_device *
359 * @res: pointer to an array of struct resource to be filled in
361 * Populate one or more empty struct resource pointed to by @res with
362 * the resource data for this omap_device @od. Used by
363 * omap_device_build_ss() after calling omap_device_count_resources().
364 * Ideally this function would not be needed at all. If omap_device
365 * replaces platform_device, then we can specify our own
366 * get_resource()/ get_irq()/etc functions that use the underlying
367 * omap_hwmod information. Or if platform_device is extended to use
368 * subarchitecture-specific function pointers, the various
369 * platform_device functions can simply call omap_device internal
370 * functions to get device resources. Hacking around the existing
371 * platform_device code wastes memory. Returns 0.
373 int omap_device_fill_resources(struct omap_device *od, struct resource *res)
378 for (i = 0; i < od->hwmods_cnt; i++) {
379 r = omap_hwmod_fill_resources(od->hwmods[i], res);
388 * omap_device_build - build and register an omap_device with one omap_hwmod
389 * @pdev_name: name of the platform_device driver to use
390 * @pdev_id: this platform_device's connection ID
391 * @oh: ptr to the single omap_hwmod that backs this omap_device
392 * @pdata: platform_data ptr to associate with the platform_device
393 * @pdata_len: amount of memory pointed to by @pdata
394 * @pm_lats: pointer to a omap_device_pm_latency array for this device
395 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
396 * @is_early_device: should the device be registered as an early device or not
398 * Convenience function for building and registering a single
399 * omap_device record, which in turn builds and registers a
400 * platform_device record. See omap_device_build_ss() for more
401 * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
402 * passes along the return value of omap_device_build_ss().
404 struct omap_device *omap_device_build(const char *pdev_name, int pdev_id,
405 struct omap_hwmod *oh, void *pdata,
407 struct omap_device_pm_latency *pm_lats,
408 int pm_lats_cnt, int is_early_device)
410 struct omap_hwmod *ohs[] = { oh };
413 return ERR_PTR(-EINVAL);
415 return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
416 pdata_len, pm_lats, pm_lats_cnt,
421 * omap_device_build_ss - build and register an omap_device with multiple hwmods
422 * @pdev_name: name of the platform_device driver to use
423 * @pdev_id: this platform_device's connection ID
424 * @oh: ptr to the single omap_hwmod that backs this omap_device
425 * @pdata: platform_data ptr to associate with the platform_device
426 * @pdata_len: amount of memory pointed to by @pdata
427 * @pm_lats: pointer to a omap_device_pm_latency array for this device
428 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
429 * @is_early_device: should the device be registered as an early device or not
431 * Convenience function for building and registering an omap_device
432 * subsystem record. Subsystem records consist of multiple
433 * omap_hwmods. This function in turn builds and registers a
434 * platform_device record. Returns an ERR_PTR() on error, or passes
435 * along the return value of omap_device_register().
437 struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
438 struct omap_hwmod **ohs, int oh_cnt,
439 void *pdata, int pdata_len,
440 struct omap_device_pm_latency *pm_lats,
441 int pm_lats_cnt, int is_early_device)
444 struct omap_device *od;
446 struct resource *res = NULL;
448 struct omap_hwmod **hwmods;
450 if (!ohs || oh_cnt == 0 || !pdev_name)
451 return ERR_PTR(-EINVAL);
453 if (!pdata && pdata_len > 0)
454 return ERR_PTR(-EINVAL);
456 pr_debug("omap_device: %s: building with %d hwmods\n", pdev_name,
459 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
461 return ERR_PTR(-ENOMEM);
463 od->hwmods_cnt = oh_cnt;
465 hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt,
470 memcpy(hwmods, ohs, sizeof(struct omap_hwmod *) * oh_cnt);
473 pdev_name2 = kzalloc(strlen(pdev_name) + 1, GFP_KERNEL);
476 strcpy(pdev_name2, pdev_name);
478 od->pdev.name = pdev_name2;
479 od->pdev.id = pdev_id;
481 res_count = omap_device_count_resources(od);
483 res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
487 omap_device_fill_resources(od, res);
489 od->pdev.num_resources = res_count;
490 od->pdev.resource = res;
492 ret = platform_device_add_data(&od->pdev, pdata, pdata_len);
496 od->pm_lats = pm_lats;
497 od->pm_lats_cnt = pm_lats_cnt;
500 ret = omap_early_device_register(od);
502 ret = omap_device_register(od);
504 for (i = 0; i < oh_cnt; i++) {
506 _add_hwmod_clocks_clkdev(od, hwmods[i]);
523 pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
529 * omap_early_device_register - register an omap_device as an early platform
531 * @od: struct omap_device * to register
533 * Register the omap_device structure. This currently just calls
534 * platform_early_add_device() on the underlying platform_device.
535 * Returns 0 by default.
537 int omap_early_device_register(struct omap_device *od)
539 struct platform_device *devices[1];
541 devices[0] = &(od->pdev);
542 early_platform_add_devices(devices, 1);
546 #ifdef CONFIG_PM_RUNTIME
547 static int _od_runtime_suspend(struct device *dev)
549 struct platform_device *pdev = to_platform_device(dev);
552 ret = pm_generic_runtime_suspend(dev);
555 omap_device_idle(pdev);
560 static int _od_runtime_idle(struct device *dev)
562 return pm_generic_runtime_idle(dev);
565 static int _od_runtime_resume(struct device *dev)
567 struct platform_device *pdev = to_platform_device(dev);
569 omap_device_enable(pdev);
571 return pm_generic_runtime_resume(dev);
575 #ifdef CONFIG_SUSPEND
576 static int _od_suspend_noirq(struct device *dev)
578 struct platform_device *pdev = to_platform_device(dev);
579 struct omap_device *od = to_omap_device(pdev);
582 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
583 return pm_generic_suspend_noirq(dev);
585 ret = pm_generic_suspend_noirq(dev);
587 if (!ret && !pm_runtime_status_suspended(dev)) {
588 if (pm_generic_runtime_suspend(dev) == 0) {
589 omap_device_idle(pdev);
590 od->flags |= OMAP_DEVICE_SUSPENDED;
597 static int _od_resume_noirq(struct device *dev)
599 struct platform_device *pdev = to_platform_device(dev);
600 struct omap_device *od = to_omap_device(pdev);
602 if (od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND)
603 return pm_generic_resume_noirq(dev);
605 if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
606 !pm_runtime_status_suspended(dev)) {
607 od->flags &= ~OMAP_DEVICE_SUSPENDED;
608 omap_device_enable(pdev);
609 pm_generic_runtime_resume(dev);
612 return pm_generic_resume_noirq(dev);
615 #define _od_suspend_noirq NULL
616 #define _od_resume_noirq NULL
619 static struct dev_pm_domain omap_device_pm_domain = {
621 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
623 USE_PLATFORM_PM_SLEEP_OPS
624 .suspend_noirq = _od_suspend_noirq,
625 .resume_noirq = _od_resume_noirq,
630 * omap_device_register - register an omap_device with one omap_hwmod
631 * @od: struct omap_device * to register
633 * Register the omap_device structure. This currently just calls
634 * platform_device_register() on the underlying platform_device.
635 * Returns the return value of platform_device_register().
637 int omap_device_register(struct omap_device *od)
639 pr_debug("omap_device: %s: registering\n", od->pdev.name);
641 od->pdev.dev.parent = &omap_device_parent;
642 od->pdev.dev.pm_domain = &omap_device_pm_domain;
643 return platform_device_register(&od->pdev);
647 /* Public functions for use by device drivers through struct platform_data */
650 * omap_device_enable - fully activate an omap_device
651 * @od: struct omap_device * to activate
653 * Do whatever is necessary for the hwmods underlying omap_device @od
654 * to be accessible and ready to operate. This generally involves
655 * enabling clocks, setting SYSCONFIG registers; and in the future may
656 * involve remuxing pins. Device drivers should call this function
657 * (through platform_data function pointers) where they would normally
658 * enable clocks, etc. Returns -EINVAL if called when the omap_device
659 * is already enabled, or passes along the return value of
660 * _omap_device_activate().
662 int omap_device_enable(struct platform_device *pdev)
665 struct omap_device *od;
667 od = to_omap_device(pdev);
669 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
671 "omap_device: %s() called from invalid state %d\n",
672 __func__, od->_state);
676 /* Enable everything if we're enabling this device from scratch */
677 if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
678 od->pm_lat_level = od->pm_lats_cnt;
680 ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);
682 od->dev_wakeup_lat = 0;
683 od->_dev_wakeup_lat_limit = UINT_MAX;
684 od->_state = OMAP_DEVICE_STATE_ENABLED;
690 * omap_device_idle - idle an omap_device
691 * @od: struct omap_device * to idle
693 * Idle omap_device @od by calling as many .deactivate_func() entries
694 * in the omap_device's pm_lats table as is possible without exceeding
695 * the device's maximum wakeup latency limit, pm_lat_limit. Device
696 * drivers should call this function (through platform_data function
697 * pointers) where they would normally disable clocks after operations
698 * complete, etc.. Returns -EINVAL if the omap_device is not
699 * currently enabled, or passes along the return value of
700 * _omap_device_deactivate().
702 int omap_device_idle(struct platform_device *pdev)
705 struct omap_device *od;
707 od = to_omap_device(pdev);
709 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
711 "omap_device: %s() called from invalid state %d\n",
712 __func__, od->_state);
716 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
718 od->_state = OMAP_DEVICE_STATE_IDLE;
724 * omap_device_shutdown - shut down an omap_device
725 * @od: struct omap_device * to shut down
727 * Shut down omap_device @od by calling all .deactivate_func() entries
728 * in the omap_device's pm_lats table and then shutting down all of
729 * the underlying omap_hwmods. Used when a device is being "removed"
730 * or a device driver is being unloaded. Returns -EINVAL if the
731 * omap_device is not currently enabled or idle, or passes along the
732 * return value of _omap_device_deactivate().
734 int omap_device_shutdown(struct platform_device *pdev)
737 struct omap_device *od;
739 od = to_omap_device(pdev);
741 if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
742 od->_state != OMAP_DEVICE_STATE_IDLE) {
744 "omap_device: %s() called from invalid state %d\n",
745 __func__, od->_state);
749 ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);
751 for (i = 0; i < od->hwmods_cnt; i++)
752 omap_hwmod_shutdown(od->hwmods[i]);
754 od->_state = OMAP_DEVICE_STATE_SHUTDOWN;
760 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
761 * @od: struct omap_device *
763 * When a device's maximum wakeup latency limit changes, call some of
764 * the .activate_func or .deactivate_func function pointers in the
765 * omap_device's pm_lats array to ensure that the device's maximum
766 * wakeup latency is less than or equal to the new latency limit.
767 * Intended to be called by OMAP PM code whenever a device's maximum
768 * wakeup latency limit changes (e.g., via
769 * omap_pm_set_dev_wakeup_lat()). Returns 0 if nothing needs to be
770 * done (e.g., if the omap_device is not currently idle, or if the
771 * wakeup latency is already current with the new limit) or passes
772 * along the return value of _omap_device_deactivate() or
773 * _omap_device_activate().
775 int omap_device_align_pm_lat(struct platform_device *pdev,
776 u32 new_wakeup_lat_limit)
779 struct omap_device *od;
781 od = to_omap_device(pdev);
783 if (new_wakeup_lat_limit == od->dev_wakeup_lat)
786 od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;
788 if (od->_state != OMAP_DEVICE_STATE_IDLE)
790 else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
791 ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
792 else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
793 ret = _omap_device_activate(od, USE_WAKEUP_LAT);
799 * omap_device_get_pwrdm - return the powerdomain * associated with @od
800 * @od: struct omap_device *
802 * Return the powerdomain associated with the first underlying
803 * omap_hwmod for this omap_device. Intended for use by core OMAP PM
804 * code. Returns NULL on error or a struct powerdomain * upon
807 struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
810 * XXX Assumes that all omap_hwmod powerdomains are identical.
811 * This may not necessarily be true. There should be a sanity
812 * check in here to WARN() if any difference appears.
817 return omap_hwmod_get_pwrdm(od->hwmods[0]);
821 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
822 * @od: struct omap_device *
824 * Return the MPU's virtual address for the base of the hwmod, from
825 * the ioremap() that the hwmod code does. Only valid if there is one
826 * hwmod associated with this device. Returns NULL if there are zero
827 * or more than one hwmods associated with this omap_device;
828 * otherwise, passes along the return value from
829 * omap_hwmod_get_mpu_rt_va().
831 void __iomem *omap_device_get_rt_va(struct omap_device *od)
833 if (od->hwmods_cnt != 1)
836 return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
840 * Public functions intended for use in omap_device_pm_latency
841 * .activate_func and .deactivate_func function pointers
845 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
846 * @od: struct omap_device *od
848 * Enable all underlying hwmods. Returns 0.
850 int omap_device_enable_hwmods(struct omap_device *od)
854 for (i = 0; i < od->hwmods_cnt; i++)
855 omap_hwmod_enable(od->hwmods[i]);
857 /* XXX pass along return value here? */
862 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
863 * @od: struct omap_device *od
865 * Idle all underlying hwmods. Returns 0.
867 int omap_device_idle_hwmods(struct omap_device *od)
871 for (i = 0; i < od->hwmods_cnt; i++)
872 omap_hwmod_idle(od->hwmods[i]);
874 /* XXX pass along return value here? */
879 * omap_device_disable_clocks - disable all main and interface clocks
880 * @od: struct omap_device *od
882 * Disable 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_disable_clocks(struct omap_device *od)
889 for (i = 0; i < od->hwmods_cnt; i++)
890 omap_hwmod_disable_clocks(od->hwmods[i]);
892 /* XXX pass along return value here? */
897 * omap_device_enable_clocks - enable all main and interface clocks
898 * @od: struct omap_device *od
900 * Enable the main functional clock and interface clock for all of the
901 * omap_hwmods associated with the omap_device. Returns 0.
903 int omap_device_enable_clocks(struct omap_device *od)
907 for (i = 0; i < od->hwmods_cnt; i++)
908 omap_hwmod_enable_clocks(od->hwmods[i]);
910 /* XXX pass along return value here? */
914 struct device omap_device_parent = {
916 .parent = &platform_bus,
919 static int __init omap_device_init(void)
921 return device_register(&omap_device_parent);
923 core_initcall(omap_device_init);