linux-kernel - Re: [PATCH] dt-bindings: rtc: pcf2127: update bindings

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Message-ID: <0a8fd7f3-58c1-9e20-bcfa-9872b3dc3550@prevas.dk>
Date:   Wed, 27 Jan 2021 14:07:59 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: rtc: pcf2127: update bindings

On 26/01/2021 23.48, Alexandre Belloni wrote:
> On 21/12/2020 22:17:54+0100, Rasmus Villemoes wrote:
>> On 19/12/2020 02.34, Alexandre Belloni wrote:
>>> pcf2127, pcf2129 and pca2129 support start-year and reset-source.
>>>
>>
>> No, the 2129 variant doesn't even have a reset output pin. Not sure if
>> there's any way to reflect that, and it probably doesn't matter, since
>> nobody's going to add the reset-source property to a 2129 node. But the
>> commit message is a bit misleading.
>>
> 
> Actually no, the INT pin can be used as a reset, the pcf/pca2129
> can be used as a watchdog and so it may need the reset-source property.

Unless I'm missing something, that would require some rather creative
extra circuitry: The interrupt pin is kept low until the appropriate bit
in the rtc is cleared, so if that is routed directly to a reset pin on
the SOC, the SOC would be kept in reset indefinitely.

Rasmus