linux-kernel - Re: [PATCH v2 1/3] dt-bindings: rtc: add reset-source property

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Date:   Fri, 11 Dec 2020 16:30:22 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Qiang Zhao <qiang.zhao@....com>,
        Bruno Thomsen <bruno.thomsen@...il.com>
Subject: Re: [PATCH v2 1/3] dt-bindings: rtc: add reset-source property

On Fri, Dec 11, 2020 at 3:56 PM Rasmus Villemoes
<rasmus.villemoes@...vas.dk> wrote:
>
> 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.

Why not use the watchdog 'timeout-sec' property?

Please send DT patches to the DT list.

>
> 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 ee237b2ed66a..b5e24dc24b0b 100644
> --- a/Documentation/devicetree/bindings/rtc/rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/rtc.yaml
> @@ -47,4 +47,9 @@ 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.
> +
>  ...
> --
> 2.23.0
>