// 获得 tick-less 模式相关工作参数
void        ms_bsp_tick_less_param(ms_tick_t *max_tick, ms_tick_t *min_tick,
                                   ms_uint32_t *timer_cnt_per_tick,
                                   ms_uint32_t *timer_stop_compensation);

// 进入 tick-less CPU 休眠模式
void        ms_bsp_tick_less_sleep(ms_tick_t expected_tick, ms_arch_sr_t sr);

// 设置 CPU 运行模式
void        ms_bsp_pm_set_run_mode(ms_pm_run_mode_t run_mode);

// 设备驱动操作
typedef struct {
    ...
    // 根据运行模式调整设备的运行频率
    void       (*adjust_freq)(ms_ptr_t ctx, ms_pm_run_mode_t run_mode);
    ...
} const ms_io_driver_ops_t;

// 响应电源管理的通知事件
void        ms_bsp_pm_notify(ms_pm_sleep_mode_t sleep_mode, ms_pm_event_t event);

// 让 CPU 进入指定的休眠模式
void        ms_bsp_pm_sleep(ms_pm_sleep_mode_t sleep_mode, ms_arch_sr_t sr);

// 启动低功耗定时器
void        ms_bsp_pm_timer_start(ms_tick_t tick);

// 停止低功耗定时器
void        ms_bsp_pm_timer_stop(void);

// 获得 CPU 休眠期间低功耗定时器流逝的嘀嗒数
ms_tick_t   ms_bsp_pm_timer_elapsed(void);

// 设备驱动操作
typedef struct {
    ...
    // 挂起设备
    ms_err_t   (*suspend)(ms_ptr_t ctx, ms_pm_sleep_mode_t sleep_mode);
    // 恢复设备
    void       (*resume)(ms_ptr_t ctx, ms_pm_sleep_mode_t sleep_mode);
    ...
} const ms_io_driver_ops_t;