linux-kernel - [PATCH 5.10 05/20] dt-bindings: rtc: add reset-source property

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Date:   Thu,  7 Jan 2021 15:34:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 5.10 05/20] dt-bindings: rtc: add reset-source property

From: Rasmus Villemoes <rasmus.villemoes@...vas.dk>

commit 320d159e2d63a97a40f24cd6dfda5a57eec65b91 upstream.

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>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Link: https://lore.kernel.org/r/20201218101054.25416-2-rasmus.villemoes@prevas.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 Documentation/devicetree/bindings/rtc/rtc.yaml |    5 +++++
 1 file changed, 5 insertions(+)

--- 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
 
 ...