设备树查看

原设备树文件 rockchip_suspend: rockchip-suspend { compatible = “rockchip,pm-rk3568”; status = “disabled”; rockchip,sleep-debug-en = <1>; rockchip,sleep-mode-config = < (0 // | RKPM_SLP_ARMOFF_LOGOFF | RKPM_SLP_CENTER_OFF | RKPM_SLP_HW_PLLS_OFF // | RKPM_SLP_PMUALIVE_32K // | RKPM_SLP_OSC_DIS // | RKPM_SLP_PMIC_LP // | RKPM_SLP_32K_PVTM ) >; rockchip,wakeup-config = < (0 | RKPM_GPIO_WKUP_EN ) >; };

设备树配置比较混乱，可以反编译最终得到的设备树文件 dtc -I dtb -O dts -o output.dts input.dtb

比如在其中寻找rockchip_suspend这个节点，会发现其指向了rockchip-suspend rockchip_suspend = “/rockchip-suspend”;

然后寻找rockchip-suspend这个节点 rockchip-suspend { compatible = “rockchip,pm-rk3568”; status = “okay”; rockchip,sleep-debug-en = <0x1>; rockchip,sleep-mode-config = <0x44>; rockchip,wakeup-config = <0x10>; phandle = <0x158>; };

就可以看到这个节点实际上是被启用的 status = “okay”;

比如rockchip,sleep-mode-config = <0x44>; 0x44 实际上是0b 0100 0100 对应了 rockchip,sleep-mode-config = < (0 // | RKPM_SLP_ARMOFF_LOGOFF | RKPM_SLP_CENTER_OFF | RKPM_SLP_HW_PLLS_OFF // | RKPM_SLP_PMUALIVE_32K // | RKPM_SLP_OSC_DIS // | RKPM_SLP_PMIC_LP // | RKPM_SLP_32K_PVTM )

; 从 kernel/include/dt-bindings/suspend/rockchip-rk3568.h 可以看到 #define BIT(nr) (1 « (nr)) #define RKPM_SLP_CENTER_OFF BIT(2) #define RKPM_SLP_HW_PLLS_OFF BIT(6) 是对应的