linux-kernel - Re: [PATCH] dt-bindings: mfd: x-powers,axp152: make interrupt optional for more chips

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Message-ID: <20230804153432.GA1388331-robh@kernel.org>
Date:   Fri, 4 Aug 2023 09:34:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Icenowy Zheng <uwu@...nowy.me>,
        Shengyu Qu <wiagn233@...look.com>,
        Martin Botka <martin.botka@...ainline.org>,
        Martin Botka <martin@...u3d.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] dt-bindings: mfd: x-powers,axp152: make interrupt
 optional for more chips

On Wed, Aug 02, 2023 at 03:18:29PM +0100, Andre Przywara wrote:
> All X-Powers PMICs described by this binding have an IRQ pin, and so
> far (almost) all boards connected this to some NMI pin or GPIO on the SoC
> they are connected to.
> However we start to see boards that omit this connection, and technically
> the IRQ pin is not essential to the basic PMIC operation.
> The existing Linux driver allows skipping an IRQ pin setup for some
> chips already, so update the binding to also make the DT property
> optional for these chips, so that we can actually have DTs describing
> boards with the PMIC interrupt not wired up.
> 
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
> Hi,
> 
> arguably the IRQ functionality is optional for many more PMICs,
> especially if a board doesn't use GPIOs or a power key.
> So I wonder if the interrupts property should become optional for all?
> After all it's more a board designer's decision to wire up the IRQ pin
> or not, and nothing that's really related to a particular PMIC.

I would say yes. Particularly if it gets rid of a conditional schema.

Rob