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251 lines
7.3 KiB
251 lines
7.3 KiB
/* |
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* pm_domain.h - Definitions and headers related to device power domains. |
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* |
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
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* |
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* This file is released under the GPLv2. |
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*/ |
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#ifndef _LINUX_PM_DOMAIN_H |
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#define _LINUX_PM_DOMAIN_H |
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#include <linux/device.h> |
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#include <linux/mutex.h> |
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#include <linux/pm.h> |
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#include <linux/err.h> |
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#include <linux/of.h> |
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#include <linux/notifier.h> |
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/* Defines used for the flags field in the struct generic_pm_domain */ |
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#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */ |
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enum gpd_status { |
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GPD_STATE_ACTIVE = 0, /* PM domain is active */ |
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GPD_STATE_POWER_OFF, /* PM domain is off */ |
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}; |
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struct dev_power_governor { |
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bool (*power_down_ok)(struct dev_pm_domain *domain); |
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bool (*stop_ok)(struct device *dev); |
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}; |
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struct gpd_dev_ops { |
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int (*start)(struct device *dev); |
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int (*stop)(struct device *dev); |
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int (*save_state)(struct device *dev); |
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int (*restore_state)(struct device *dev); |
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bool (*active_wakeup)(struct device *dev); |
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}; |
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struct generic_pm_domain { |
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struct dev_pm_domain domain; /* PM domain operations */ |
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struct list_head gpd_list_node; /* Node in the global PM domains list */ |
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struct list_head master_links; /* Links with PM domain as a master */ |
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struct list_head slave_links; /* Links with PM domain as a slave */ |
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struct list_head dev_list; /* List of devices */ |
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struct mutex lock; |
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struct dev_power_governor *gov; |
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struct work_struct power_off_work; |
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const char *name; |
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atomic_t sd_count; /* Number of subdomains with power "on" */ |
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enum gpd_status status; /* Current state of the domain */ |
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unsigned int device_count; /* Number of devices */ |
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unsigned int suspended_count; /* System suspend device counter */ |
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unsigned int prepared_count; /* Suspend counter of prepared devices */ |
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bool suspend_power_off; /* Power status before system suspend */ |
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int (*power_off)(struct generic_pm_domain *domain); |
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s64 power_off_latency_ns; |
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int (*power_on)(struct generic_pm_domain *domain); |
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s64 power_on_latency_ns; |
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struct gpd_dev_ops dev_ops; |
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s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ |
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bool max_off_time_changed; |
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bool cached_power_down_ok; |
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int (*attach_dev)(struct generic_pm_domain *domain, |
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struct device *dev); |
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void (*detach_dev)(struct generic_pm_domain *domain, |
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struct device *dev); |
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unsigned int flags; /* Bit field of configs for genpd */ |
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}; |
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static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) |
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{ |
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return container_of(pd, struct generic_pm_domain, domain); |
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} |
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struct gpd_link { |
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struct generic_pm_domain *master; |
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struct list_head master_node; |
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struct generic_pm_domain *slave; |
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struct list_head slave_node; |
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}; |
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struct gpd_timing_data { |
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s64 suspend_latency_ns; |
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s64 resume_latency_ns; |
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s64 effective_constraint_ns; |
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bool constraint_changed; |
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bool cached_stop_ok; |
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}; |
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struct pm_domain_data { |
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struct list_head list_node; |
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struct device *dev; |
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}; |
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struct generic_pm_domain_data { |
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struct pm_domain_data base; |
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struct gpd_timing_data td; |
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struct notifier_block nb; |
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}; |
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#ifdef CONFIG_PM_GENERIC_DOMAINS |
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static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) |
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{ |
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return container_of(pdd, struct generic_pm_domain_data, base); |
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} |
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
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{ |
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return to_gpd_data(dev->power.subsys_data->domain_data); |
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} |
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extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev); |
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extern int __pm_genpd_add_device(struct generic_pm_domain *genpd, |
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struct device *dev, |
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struct gpd_timing_data *td); |
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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
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struct device *dev); |
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extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
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struct generic_pm_domain *new_subdomain); |
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extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
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struct generic_pm_domain *target); |
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extern void pm_genpd_init(struct generic_pm_domain *genpd, |
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struct dev_power_governor *gov, bool is_off); |
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extern struct dev_power_governor simple_qos_governor; |
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extern struct dev_power_governor pm_domain_always_on_gov; |
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#else |
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
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{ |
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return ERR_PTR(-ENOSYS); |
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} |
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static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) |
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{ |
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return NULL; |
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} |
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static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd, |
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struct device *dev, |
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struct gpd_timing_data *td) |
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{ |
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return -ENOSYS; |
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} |
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static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
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struct device *dev) |
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{ |
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return -ENOSYS; |
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} |
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static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
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struct generic_pm_domain *new_sd) |
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{ |
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return -ENOSYS; |
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} |
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static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
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struct generic_pm_domain *target) |
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{ |
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return -ENOSYS; |
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} |
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static inline void pm_genpd_init(struct generic_pm_domain *genpd, |
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struct dev_power_governor *gov, bool is_off) |
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{ |
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} |
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#endif |
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, |
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struct device *dev) |
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{ |
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return __pm_genpd_add_device(genpd, dev, NULL); |
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} |
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#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP |
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extern void pm_genpd_syscore_poweroff(struct device *dev); |
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extern void pm_genpd_syscore_poweron(struct device *dev); |
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#else |
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static inline void pm_genpd_syscore_poweroff(struct device *dev) {} |
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static inline void pm_genpd_syscore_poweron(struct device *dev) {} |
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#endif |
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/* OF PM domain providers */ |
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struct of_device_id; |
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struct genpd_onecell_data { |
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struct generic_pm_domain **domains; |
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unsigned int num_domains; |
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}; |
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typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, |
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void *data); |
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
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int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
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void *data); |
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void of_genpd_del_provider(struct device_node *np); |
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struct generic_pm_domain *of_genpd_get_from_provider( |
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struct of_phandle_args *genpdspec); |
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struct generic_pm_domain *__of_genpd_xlate_simple( |
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struct of_phandle_args *genpdspec, |
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void *data); |
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struct generic_pm_domain *__of_genpd_xlate_onecell( |
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struct of_phandle_args *genpdspec, |
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void *data); |
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int genpd_dev_pm_attach(struct device *dev); |
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#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ |
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static inline int __of_genpd_add_provider(struct device_node *np, |
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genpd_xlate_t xlate, void *data) |
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{ |
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return 0; |
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} |
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static inline void of_genpd_del_provider(struct device_node *np) {} |
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static inline struct generic_pm_domain *of_genpd_get_from_provider( |
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struct of_phandle_args *genpdspec) |
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{ |
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return NULL; |
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} |
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#define __of_genpd_xlate_simple NULL |
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#define __of_genpd_xlate_onecell NULL |
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static inline int genpd_dev_pm_attach(struct device *dev) |
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{ |
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return -ENODEV; |
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} |
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#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
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static inline int of_genpd_add_provider_simple(struct device_node *np, |
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struct generic_pm_domain *genpd) |
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{ |
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return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd); |
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} |
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static inline int of_genpd_add_provider_onecell(struct device_node *np, |
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struct genpd_onecell_data *data) |
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{ |
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return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data); |
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} |
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#ifdef CONFIG_PM |
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extern int dev_pm_domain_attach(struct device *dev, bool power_on); |
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extern void dev_pm_domain_detach(struct device *dev, bool power_off); |
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#else |
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static inline int dev_pm_domain_attach(struct device *dev, bool power_on) |
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{ |
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return -ENODEV; |
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} |
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static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {} |
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#endif |
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#endif /* _LINUX_PM_DOMAIN_H */
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