linux-kernel - Re: [PATCH v4 2/9] dt-bindings: rtc: mediatek: convert MT6397 rtc documentation

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Message-ID: <Y3NIRbyirJjT7xay@mail.local>
Date:   Tue, 15 Nov 2022 09:05:25 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh@...nel.org>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Fabien Parent <fabien.parent@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Lee Jones <lee@...nel.org>,
        Chen Zhong <chen.zhong@...iatek.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Pavel Machek <pavel@....cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Fabien Parent <fparent@...libre.com>,
        linux-rtc@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org,
        Mattijs Korpershoek <mkorpershoek@...libre.com>
Subject: Re: [PATCH v4 2/9] dt-bindings: rtc: mediatek: convert MT6397 rtc
 documentation

On 15/11/2022 08:56:40+0100, Krzysztof Kozlowski wrote:
> On 14/11/2022 23:57, Alexandre Belloni wrote:
> 
> >>>> As this is only a compatible string, just fold this into the MFD schema 
> >>>> doc.
> >>>
> >>> Actually, it probably also supports the start-year property
> >>
> > 
> > I checked and it doesn't support it but this needs to be fixed.
> > 
> >> What about rest of rtc.yaml schema?
> >>
> > 
> > wakeup-source would make sense but the driver doesn't support it yet.
> 
> The question is about hardware - does hardware support waking up the
> system via interrupt? This is usually a domain of PMICs which still are
> powered on when system sleeps.
> 

I'd say that it is possible that a PMIC is able to wake up the system
with or without having an interrupt wired to the SoC so wakeup-source
makes sense. We don't need it if it is interrupt only.

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com