1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/rtc/amlogic,meson-vrtc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Amlogic Virtual RTC (VRTC)
8
9 maintainers:
10 - Neil Armstrong <neil.armstrong@linaro.org>
11
12 description: |
13 This is a Linux interface to an RTC managed by firmware, hence it's
14 virtual from a Linux perspective. The interface is 1 register where
15 an alarm time (in seconds) is to be written.
16 The alarm register is a simple scratch register shared between the
17 application processors (AP) and the secure co-processor (SCP.) When
18 the AP suspends, the SCP will use the value of this register to
19 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
22 allOf:
23 - $ref: rtc.yaml#
24
25 properties:
26 compatible:
27 enum:
28 - amlogic,meson-vrtc
29
30 reg:
31 maxItems: 1
32
33 required:
34 - compatible
35 - reg
36
37 additionalProperties: false
38
39 examples:
40 - |
41 rtc@a8 {
42 compatible = "amlogic,meson-vrtc";
43 reg = <0x000a8 0x4>;
44 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.