# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/rtc/amlogic,meson-vrtc.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: Amlogic Virtual RTC (VRTC) maintainers: - Neil Armstrong description: | 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. 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. allOf: - $ref: rtc.yaml# properties: compatible: enum: - amlogic,meson-vrtc reg: maxItems: 1 required: - compatible - reg additionalProperties: false examples: - | rtc@a8 { compatible = "amlogic,meson-vrtc"; reg = <0x000a8 0x4>; };