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Date:   Mon, 10 Oct 2022 07:57:58 -0500
From:   Rob Herring <robh@kernel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Yassine Oudjana <yassine.oudjana@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Sean Wang <sean.wang@kernel.org>,
        Andy Teng <andy.teng@mediatek.com>,
        Yassine Oudjana <y.oudjana@protonmail.com>,
        linux-mediatek@lists.infradead.org, linux-gpio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 05/10] dt-bindings: pinctrl: mediatek,pinctrl-mt6795:
 Fix interrupt count
Message-ID: <20221010125758.GA468288-robh@kernel.org>
References: <20221007125904.55371-1-y.oudjana@protonmail.com>
 <20221007125904.55371-6-y.oudjana@protonmail.com>
 <0769c6c8-567d-68c0-323a-9aaee1241e13@linaro.org>
 <6c889c7e-4c5a-a201-e37c-bf95b6826584@collabora.com>
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On Mon, Oct 10, 2022 at 01:47:18PM +0200, AngeloGioacchino Del Regno wrote:
> Il 10/10/22 13:13, Krzysztof Kozlowski ha scritto:
> > On 07/10/2022 08:58, Yassine Oudjana wrote:
> > > From: Yassine Oudjana <y.oudjana@protonmail.com>
> > > 
> > > The document currently states a maximum of 1 interrupt, but the DT
> > > has 2 specified causing a dtbs_check error. Replace the maximum limit
> > > with a minimum and add per-interrupt descriptions to pass the check.
> > > 
> > > Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> > > Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
> > > ---
> > >   .../devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml | 5 ++++-
> > >   1 file changed, 4 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml
> > > index 73ae6e11410b..a3a3f7fb9605 100644
> > > --- a/Documentation/devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml
> > > +++ b/Documentation/devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml
> > > @@ -47,7 +47,10 @@ properties:
> > >     interrupts:
> > >       description: The interrupt outputs to sysirq.
> > > -    maxItems: 1
> > > +    minItems: 1
> > > +    items:
> > > +      - description: EINT interrupt
> > > +      - description: EINT event_b interrupt
> > 
> > Is second interrupt really optional or you just wanted to silence the
> > warning?
> > 
> 
> The event_b interrupt exists (and fires on certain events, if configured to do so),
> but it's currently unused.
> 
> It's really optional.

Optional for DT means may or may not be wired up in the h/w, not what 
some OS 'currently' uses.

However, you can't really add new required properties or entries to an 
existing DT without breaking compatibility. Maybe that is not yet a 
concern.

Rob