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dt-bindings: rtc: Convert Amlogic Meson vrtc controller binding

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Convert Amlogic Meson vrtc controller binding to yaml.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/d820d54b-d082-589a-621f-2795d885696a@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Heiner Kallweit 2023-01-25 23:24:24 +01:00 committed by Alexandre Belloni
parent e5c594233f
commit 6a22a5dbc6
2 changed files with 44 additions and 22 deletions
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44
Documentation/devicetree/bindings/rtc/amlogic,meson-vrtc.yaml Normal file
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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>;
};

22
Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt
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* 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>;
};