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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/rtc/amlogic,meson-vrtc.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Amlogic Virtual RTC (VRTC)8 9maintainers:10 - Neil Armstrong <neil.armstrong@linaro.org>11 12description: |13 This is a Linux interface to an RTC managed by firmware, hence it's14 virtual from a Linux perspective. The interface is 1 register where15 an alarm time (in seconds) is to be written.16 The alarm register is a simple scratch register shared between the17 application processors (AP) and the secure co-processor (SCP.) When18 the AP suspends, the SCP will use the value of this register to19 program an always-on timer before going sleep. When the timer expires,20 the SCP will wake up and will then wake the AP.21 22allOf:23 - $ref: rtc.yaml#24 25properties:26 compatible:27 enum:28 - amlogic,meson-vrtc29 30 reg:31 maxItems: 132 33required:34 - compatible35 - reg36 37additionalProperties: false38 39examples:40 - |41 rtc@a8 {42 compatible = "amlogic,meson-vrtc";43 reg = <0x000a8 0x4>;44 };45