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# 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 <neil.armstrong@linaro.org>
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>;
};
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