linux-kernel - Re: [PATCH] ARM: dts: st: add buswidth property to stm32f429-disco

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Message-ID: <CAGE=qrpE9pP4m07VT+RRLhPysF+wO690mF7ChToJYcArKm_nGg@mail.gmail.com>
Date:   Mon, 3 Jul 2023 09:13:06 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Raphaël Gallais-Pou <rgallaispou@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: st: add buswidth property to stm32f429-disco

On Mon, 3 Jul 2023 at 05:21, Raphaël Gallais-Pou <rgallaispou@...il.com> wrote:
> >>              spi-3wire;
> >>              spi-max-frequency = <10000000>;
> >>              dc-gpios = <&gpiod 13 0>;
> >> +            buswidth = <8>;
> >
> > There is no such spi property.
>
> While I agree with you, I saw in staging drivers that this property was
> fetch in the device-tree by the fbtft core.
>
> Should I document those in or try to do it another way ?

You cannot use undocumented properties. Whether this should be used at
all, depends what's this, why other properties cannot be used etc.