海思的Linux方案中系统怎么待机和唤醒

海思的芯片定位大多是监控，所以基本不需要待机，这我了解。目前我们用Hi3518EV200在可穿戴设备VR上，但是貌似SDK自带的Linux 系统没有做待机和唤醒这块，
我输入命令使系统待机后又自动被唤醒了。。。
~ # echo standby > /sys/power/state
[   26.931698] PM: suspend entry 1970-01-01 00:00:26.717853360 UTC
[   26.937628] PM: Syncing filesystems ... done.
[   26.949561] Freezing user space processes ... (elapsed 0.01 seconds) done.
[   27.140839] PM: suspend of devices complete after 167.357 msecs
[   27.147212] PM: late suspend of devices complete after 0.429 msecs
[   27.153882] PM: noirq suspend of devices complete after 0.442 msecs
[   27.160660] PM: noirq resume of devices complete after 0.386 msecs
[   27.167256] PM: early resume of devices complete after 0.393 msecs
[   27.590541] PM: resume of devices complete after 417.048 msecs
[   27.596994] Restarting tasks ... done.
[   27.601368] PM: suspend exit 1970-01-01 00:00:27.387505360 UTC
~ # [   28.411579] PHY: himii:01 - Link is Up - 10/Half

~ #

难道需要自己参照芯片手册开发吗？
有同仁在Hi3518E或者其他芯片的Linux方案上做待机和唤醒吗？