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Date:   Fri, 18 Dec 2020 11:10:53 +0100
From:   Rasmus Villemoes <>
        Alexandre Belloni <>
        Rob Herring <>,
        Uwe Kleine-K├Ânig 
        <>, Qiang Zhao <>,
        Bruno Thomsen <>,
        Rasmus Villemoes <>
Subject: [PATCH v3 1/2] dt-bindings: rtc: add reset-source property

Some RTCs, e.g. the pcf2127, can be used as a hardware watchdog. But
if the reset pin is not actually wired up, the driver exposes a
watchdog device that doesn't actually work.

Provide a standard binding that can be used to indicate that a given
RTC can perform a reset of the machine, similar to wakeup-source.

Suggested-by: Alexandre Belloni <>
Signed-off-by: Rasmus Villemoes <>
 Documentation/devicetree/bindings/rtc/rtc.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/rtc.yaml b/Documentation/devicetree/bindings/rtc/rtc.yaml
index 8acd2de3de3a..d30dc045aac6 100644
--- a/Documentation/devicetree/bindings/rtc/rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/rtc.yaml
@@ -63,6 +63,11 @@ properties:
       Enables wake up of host system on alarm.
+  reset-source:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The RTC is able to reset the machine.
 additionalProperties: true

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