Commit 07049187 authored by Sven Peter's avatar Sven Peter Committed by Alexandre Belloni
Browse files

dt-bindings: rtc: Add Apple SMC RTC 



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: default avatarMark Kettenis <kettenis@openbsd.org>
Reviewed-by: default avatarNeal Gompa <neal@gompa.dev>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Signed-off-by: default avatarSven Peter <sven@kernel.org>
Signed-off-by: default avatarJames Calligeros <jcalligeros99@gmail.com>
Reviewd-by: default avatarMark Kettenis <kettenis@openbsd.org>
Link: https://patch.msgid.link/20251112-macsmc-subdevs-v5-1-728e4b91fe81@gmail.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 40d8123f

Documentation/devicetree/bindings/mfd/apple,smc.yaml

+9 −0
Original line number Diff line number Diff line
@@ -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";

       };

      };

    };

Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml

0 → 100644
+35 −0
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# 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

MAINTAINERS

+1 −0
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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