3  * Generic Exynos Bus frequency driver with DEVFREQ Framework
9  * DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.
13 #include <linux/devfreq.h>
14 #include <linux/devfreq-event.h>
29 	struct devfreq *devfreq;  member
42  * Control the devfreq-event device to get the current state of bus
91  * devfreq function for both simple-ondemand and passive governor
130 		dev_err(dev, "failed to get event from devfreq-event devices\n");  in exynos_bus_get_dev_status()
138 	dev_dbg(dev, "Usage of devfreq-event : %lu/%lu\n", stat->busy_time,  in exynos_bus_get_dev_status()
144 		dev_err(dev, "failed to set event to devfreq-event devices\n");  in exynos_bus_get_dev_status()
158 		dev_warn(dev, "failed to disable the devfreq-event devices\n");  in exynos_bus_exit()
196 	 * Get the devfreq-event devices to get the current utilization of  in exynos_bus_parent_parse_of()
197 	 * buses. This raw data will be used in devfreq ondemand governor.  in exynos_bus_parent_parse_of()
199 	count = devfreq_event_get_edev_count(dev, "devfreq-events");  in exynos_bus_parent_parse_of()
201 		dev_err(dev, "failed to get the count of devfreq-event dev\n");  in exynos_bus_parent_parse_of()
216 							"devfreq-events", i);  in exynos_bus_parent_parse_of()
225 	 * When measuring the utilization of each AXI bus with devfreq-event  in exynos_bus_parent_parse_of()
227 	 * total cycle of bus during sampling rate. In result, the devfreq  in exynos_bus_parent_parse_of()
314 	/* Add devfreq device to monitor and handle the exynos bus */  in exynos_bus_profile_init()
315 	bus->devfreq = devm_devfreq_add_device(dev, profile,  in exynos_bus_profile_init()
318 	if (IS_ERR(bus->devfreq)) {  in exynos_bus_profile_init()
319 		dev_err(dev, "failed to add devfreq device\n");  in exynos_bus_profile_init()
320 		return PTR_ERR(bus->devfreq);  in exynos_bus_profile_init()
324 	ret = devm_devfreq_register_opp_notifier(dev, bus->devfreq);  in exynos_bus_profile_init()
331 	 * Enable devfreq-event to get raw data which is used to determine  in exynos_bus_profile_init()
336 		dev_err(dev, "failed to enable devfreq-event devices\n");  in exynos_bus_profile_init()
342 		dev_err(dev, "failed to set event to devfreq-event devices\n");  in exynos_bus_profile_init()
350 		dev_warn(dev, "failed to disable the devfreq-event devices\n");  in exynos_bus_profile_init()
360 	struct devfreq *parent_devfreq;  in exynos_bus_profile_init_passive()
366 	/* Get the instance of parent devfreq device */  in exynos_bus_profile_init_passive()
367 	parent_devfreq = devfreq_get_devfreq_by_phandle(dev, "devfreq", 0);  in exynos_bus_profile_init_passive()
377 	/* Add devfreq device for exynos bus with passive governor */  in exynos_bus_profile_init_passive()
378 	bus->devfreq = devm_devfreq_add_device(dev, profile, DEVFREQ_GOV_PASSIVE,  in exynos_bus_profile_init_passive()
380 	if (IS_ERR(bus->devfreq)) {  in exynos_bus_profile_init_passive()
382 			"failed to add devfreq dev with passive governor\n");  in exynos_bus_profile_init_passive()
383 		return PTR_ERR(bus->devfreq);  in exynos_bus_profile_init_passive()
415 	node = of_parse_phandle(dev->of_node, "devfreq", 0);  in exynos_bus_probe()
450 	max_state = bus->devfreq->profile->max_state;  in exynos_bus_probe()
451 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);  in exynos_bus_probe()
452 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);  in exynos_bus_probe()
472 	devfreq_suspend_device(bus->devfreq);  in exynos_bus_shutdown()
483 		dev_err(dev, "failed to enable the devfreq-event devices\n");  in exynos_bus_resume()
497 		dev_err(dev, "failed to disable the devfreq-event devices\n");  in exynos_bus_suspend()