1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "DT idle-states: " fmt
33 	idle_state->enter = match_id->data;  in init_state_node()
39 	idle_state->enter_s2idle = match_id->data;  in init_state_node()
41 	err = of_property_read_u32(state_node, "wakeup-latency-us",  in init_state_node()
42 				   &idle_state->exit_latency);  in init_state_node()
46 		err = of_property_read_u32(state_node, "entry-latency-us",  in init_state_node()
49 			pr_debug(" * %pOF missing entry-latency-us property\n",  in init_state_node()
51 			return -EINVAL;  in init_state_node()
54 		err = of_property_read_u32(state_node, "exit-latency-us",  in init_state_node()
57 			pr_debug(" * %pOF missing exit-latency-us property\n",  in init_state_node()
59 			return -EINVAL;  in init_state_node()
62 		 * If wakeup-latency-us is missing, default to entry+exit  in init_state_node()
65 		idle_state->exit_latency = entry_latency + exit_latency;  in init_state_node()
68 	err = of_property_read_u32(state_node, "min-residency-us",  in init_state_node()
69 				   &idle_state->target_residency);  in init_state_node()
71 		pr_debug(" * %pOF missing min-residency-us property\n",  in init_state_node()
73 		return -EINVAL;  in init_state_node()
76 	err = of_property_read_string(state_node, "idle-state-name", &desc);  in init_state_node()
78 		desc = state_node->name;  in init_state_node()
80 	idle_state->flags = 0;  in init_state_node()
81 	if (of_property_read_bool(state_node, "local-timer-stop"))  in init_state_node()
82 		idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;  in init_state_node()
88 	strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1);  in init_state_node()
89 	strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1);  in init_state_node()
109 	 * away since we certainly hit a firmware misconfiguration.  in idle_state_valid()
128  * dt_init_idle_driver() - Parse the DT idle states and initialize the
130  * @drv:	  Pointer to CPU idle driver to be initialized
141  * @start_idx:    First idle state index to be initialized
144  * array entries in the cpuidle driver are initialized accordingly starting
161 		return -EINVAL;  in dt_init_idle_driver()
166 	 * across CPUs, otherwise we hit a firmware misconfiguration.  in dt_init_idle_driver()
168 	cpumask = drv->cpumask ? : cpu_possible_mask;  in dt_init_idle_driver()
178 			err = -ENODEV;  in dt_init_idle_driver()
190 			err = -EINVAL;  in dt_init_idle_driver()
199 		idle_state = &drv->states[state_idx++];  in dt_init_idle_driver()
204 			err = -EINVAL;  in dt_init_idle_driver()
219 		drv->state_count = state_idx;  in dt_init_idle_driver()