第 1 阶段Linux Suspend/Resume↓第 2 阶段Runtime PM↓第 3 阶段GPIO/IRQ Wakeup↓第 4 阶段I2C/SPI/UART 外设 suspend/resume↓第 5 阶段regulator / clock / pinctrl↓第 6 阶段功耗测量 trace/ftrace↓Qualcomm RB5↓PMIC / RPMh / genpd / 电源域“Raspberry Pi Linux PM Lab自己写一个 platform driver实现 Runtime PM System Suspend/Resume GPIO Wakeup然后用 ftrace 把完整 PM 时序抓出来。”I2C/SPI 做“休眠后无法通信”System Suspend│↓device suspend│↓Runtime PM│↓genpd│┌──────┴──────┐↓ ↓clock regulator│ │└──────┬──────┘↓power off