* Amlogic Virtual RTC (VRTC) This is a Linux interface to an RTC managed by firmware, hence it's virtual from a Linux perspective. The interface is 1 register where an alarm time (in seconds) is to be written. Required properties: - compatible: should be "amlogic,meson-vrtc" - reg: physical address for the alarm register The alarm register is a simple scratch register shared between the application processors (AP) and the secure co-processor (SCP.) When the AP suspends, the SCP will use the value of this register to program an always-on timer before going sleep. When the timer expires, the SCP will wake up and will then wake the AP. Example: vrtc: rtc@0a8 { compatible = "amlogic,meson-vrtc"; reg = <0x0 0x000a8 0x0 0x4>; }; |