linux/Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml at aee3b283827bba837ad8ae7da228d048d25797ed · AsahiLinux/linux · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/rtc/apple,smc-rtc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Apple SMC RTC

description:
  Apple Silicon Macs (M1, etc.) have an RTC that is part of the PMU IC,
  but most of the PMU functionality is abstracted out by the SMC.
  An additional RTC offset stored inside NVMEM is required to compute
  the current date/time.

maintainers:
  - Sven Peter <sven@kernel.org>

properties:
  compatible:
    const: apple,smc-rtc

  nvmem-cells:
    items:
      - description: 48bit RTC offset, specified in 32768 (2^15) Hz clock ticks

  nvmem-cell-names:
    items:
      - const: rtc_offset

required:
  - compatible
  - nvmem-cells
  - nvmem-cell-names

additionalProperties: false