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dt-bindings: rtc: Add Apple SMC RTC

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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.

Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sven Peter <sven@kernel.org>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
Reviewd-by: Mark Kettenis <kettenis@openbsd.org>
Link: https://patch.msgid.link/20251112-macsmc-subdevs-v5-1-728e4b91fe81@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Sven Peter 2025-11-12 21:16:47 +10:00 • committed by Alexandre Belloni
parent 40d8123ff7
commit 07049187e8
3 changed files with 45 additions and 0 deletions
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9
Documentation/devicetree/bindings/mfd/apple,smc.yaml
View file

@ -46,6 +46,9 @@ properties:
reboot:
$ref: /schemas/power/reset/apple,smc-reboot.yaml
rtc:
$ref: /schemas/rtc/apple,smc-rtc.yaml
additionalProperties: false
required:
@ -80,5 +83,11 @@ examples:
nvmem-cell-names = "shutdown_flag", "boot_stage",
"boot_error_count", "panic_count";
};
rtc {
compatible = "apple,smc-rtc";
nvmem-cells = <&rtc_offset>;
nvmem-cell-names = "rtc_offset";
};
};
};

35
Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml Normal file
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@ -0,0 +1,35 @@
# 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

1
MAINTAINERS
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@ -2435,6 +2435,7 @@ F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml
F: Documentation/devicetree/bindings/power/apple*
F: Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml
F: Documentation/devicetree/bindings/pwm/apple,s5l-fpwm.yaml
F: Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml
F: Documentation/devicetree/bindings/spi/apple,spi.yaml
F: Documentation/devicetree/bindings/spmi/apple,spmi.yaml
F: Documentation/devicetree/bindings/watchdog/apple,wdt.yaml