1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/rtc/rtc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Real Time Clock Common Properties
8
9maintainers:
10  - Alexandre Belloni <alexandre.belloni@bootlin.com>
11
12description: |
13  This document describes generic bindings which can be used to
14  describe Real Time Clock devices in a device tree.
15
16properties:
17  $nodename:
18    pattern: "^rtc(@.*|-[0-9a-f])*$"
19
20  aux-voltage-chargeable:
21    $ref: /schemas/types.yaml#/definitions/uint32
22    enum: [0, 1]
23    description: |
24      Tells whether the battery/supercap of the RTC (if any) is
25      chargeable or not:
26      0: not chargeable
27      1: chargeable
28
29  quartz-load-femtofarads:
30    description:
31      The capacitive load of the quartz(x-tal), expressed in femto
32      Farad (fF). The default value shall be listed (if optional),
33      and likewise all valid values.
34
35  start-year:
36    $ref: /schemas/types.yaml#/definitions/uint32
37    description:
38      If provided, the default hardware range supported by the RTC is
39      shifted so the first usable year is the specified one.
40
41  trickle-diode-disable:
42    $ref: /schemas/types.yaml#/definitions/flag
43    description:
44      Do not use internal trickle charger diode. Should be given if
45      internal trickle charger diode should be disabled.
46    deprecated: true
47
48  trickle-resistor-ohms:
49    description:
50      Selected resistor for trickle charger. Should be given
51      if trickle charger should be enabled.
52
53  trickle-voltage-millivolt:
54    description:
55      Selected voltage for trickle charger. Should be given
56      if trickle charger should be enabled and the trickle voltage is different
57      from the RTC main power supply.
58
59  wakeup-source:
60    $ref: /schemas/types.yaml#/definitions/flag
61    description:
62      Enables wake up of host system on alarm.
63
64  reset-source:
65    $ref: /schemas/types.yaml#/definitions/flag
66    description:
67      The RTC is able to reset the machine.
68
69additionalProperties: true
70
71...
72