1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "DT idle-states: " fmt
32 	idle_state->enter = match_id->data;  in init_state_node()
38 	idle_state->enter_s2idle = match_id->data;  in init_state_node()
40 	err = of_property_read_u32(state_node, "wakeup-latency-us",  in init_state_node()
41 				   &idle_state->exit_latency);  in init_state_node()
45 		err = of_property_read_u32(state_node, "entry-latency-us",  in init_state_node()
48 			pr_debug(" * %pOF missing entry-latency-us property\n",  in init_state_node()
50 			return -EINVAL;  in init_state_node()
53 		err = of_property_read_u32(state_node, "exit-latency-us",  in init_state_node()
56 			pr_debug(" * %pOF missing exit-latency-us property\n",  in init_state_node()
58 			return -EINVAL;  in init_state_node()
61 		 * If wakeup-latency-us is missing, default to entry+exit  in init_state_node()
64 		idle_state->exit_latency = entry_latency + exit_latency;  in init_state_node()
67 	err = of_property_read_u32(state_node, "min-residency-us",  in init_state_node()
68 				   &idle_state->target_residency);  in init_state_node()
70 		pr_debug(" * %pOF missing min-residency-us property\n",  in init_state_node()
72 		return -EINVAL;  in init_state_node()
75 	err = of_property_read_string(state_node, "idle-state-name", &desc);  in init_state_node()
77 		desc = state_node->name;  in init_state_node()
79 	idle_state->flags = CPUIDLE_FLAG_RCU_IDLE;  in init_state_node()
80 	if (of_property_read_bool(state_node, "local-timer-stop"))  in init_state_node()
81 		idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;  in init_state_node()
87 	strscpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN);  in init_state_node()
88 	strscpy(idle_state->desc, desc, CPUIDLE_DESC_LEN);  in init_state_node()
101 	bool valid = true;  in idle_state_valid()  local
115 			valid = false;  in idle_state_valid()
119 		if (!valid)  in idle_state_valid()
123 	return valid;  in idle_state_valid()
127  * dt_init_idle_driver() - Parse the DT idle states and initialize the
131  *		  compatible idle state nodes. The data pointer for each valid
142  * If DT idle states are detected and are valid the state count and states
146  * Return: number of valid DT idle states parsed, <0 on failure
160 		return -EINVAL;  in dt_init_idle_driver()
163 	 * driver mask (or cpu_possible_mask if the driver cpumask is not set)  in dt_init_idle_driver()
167 	cpumask = drv->cpumask ? : cpu_possible_mask;  in dt_init_idle_driver()
177 			err = -ENODEV;  in dt_init_idle_driver()
187 			pr_warn("%pOF idle state not valid, bailing out\n",  in dt_init_idle_driver()
189 			err = -EINVAL;  in dt_init_idle_driver()
198 		idle_state = &drv->states[state_idx++];  in dt_init_idle_driver()
203 			err = -EINVAL;  in dt_init_idle_driver()
215 	drv->state_count = state_idx;  in dt_init_idle_driver()
218 	 * Return the number of present and valid DT idle states, which can  in dt_init_idle_driver()
222 	return state_idx - start_idx;  in dt_init_idle_driver()