WIFI --- OOB(out of band)
OOB interrupts implementation is intended
to provide a faster interrupt mechanism for SDIO host controllers that
don't support SDIO interrupt. Also it provides the possibility that
dongle can wake up the application processor in deep sleep. So we
can have more offloading features to improve the overall system power
consumption especially for mobility platform.
CONFIG_BCMDHD_OOB
CUSTOMER_OOB
WIFI 支持 OOB,表示 WIFI 有个单独的引脚通知主机数据是否到来,主机采用中断方式获取这个引脚信号