linux-kernel - Re: [PATCH 0/2] rewrite mtk-quadspi spi-nor driver with spi-mem

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Date:   Wed, 26 Feb 2020 11:36:10 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Chuanhong Guo <gch981213@...il.com>
Cc:     Rob Herring <robh@...nel.org>, linux-mediatek@...ts.infradead.org,
        linux-spi@...r.kernel.org, linux-mtd@...ts.infradead.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] rewrite mtk-quadspi spi-nor driver with spi-mem

On Wed, Feb 26, 2020 at 09:31:33AM +0800, Chuanhong Guo wrote:
> On Wed, Feb 26, 2020 at 1:31 AM Rob Herring <robh@...nel.org> wrote:

> > You should should really only need 'spi-max-frequency' if the max freq
> > is less than the minimum of the host and device max freq.

> But current spi framework forces that a "spi-max-frequency" property
> is present. [0]
> Should we patch spi framework then?

That's one option, yes.  As far as I can tell the bindings have always
required an explicit frequency specified in the bindings but I've no
idea why.

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