linux-kernel - Re: [PATCH 1/2] spi: support inter-word delay requirement for devices

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Message-ID: <20190128114757.GA11699@sirena.org.uk>
Date:   Mon, 28 Jan 2019 11:47:57 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jonas Bonn <jonas@...rbonn.se>,
        Baolin Wang <baolin.wang@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] spi: support inter-word delay requirement for devices

On Mon, Jan 28, 2019 at 08:41:05AM +0100, Geert Uytterhoeven wrote:
> On Sat, Jan 26, 2019 at 4:40 PM Jonas Bonn <jonas@...rbonn.se> wrote:

> > spi-3wire: again, only set by MAXIM DS-1302 which always needs this
> > setting; driver could set this

> For DS1302, this is probable true.
> Some devices may support both 4-wire or 3-wire mode?

IIRC yes.

> > Yeah, that one make sense.  But if the DT is only overriding the maximum
> > device frequency that the driver should otherwise be setting, why is
> > spi-max-frequency a _required_ property?

> That's a good question. Legacy?

It's a documentation error.

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