linux-kernel - [PATCH v3 1/2] dt-bindings: rtc: add reset-source property

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Date:   Fri, 18 Dec 2020 11:10:53 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     linux-rtc@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Qiang Zhao <qiang.zhao@....com>,
        Bruno Thomsen <bruno.thomsen@...il.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
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 <alexandre.belloni@...tlin.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
---
 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:
     description:
       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
 
 ...
-- 
2.23.0