linux-kernel - Re: [PATCH v8 3/3] fpga: Add support for Lattice iCE40 FPGAs

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Message-ID: <CAAtXAHe_pz=oUpeP+t-Fy0z88LMmTeSffkD2Cbun3r+uTnmGYw@mail.gmail.com>
Date:   Tue, 8 Nov 2016 09:06:10 -0800
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Marek Vasut <marex@...x.de>
Cc:     Joel Holdsworth <joel@...webreathe.org.uk>,
        Alan Tull <atull@...nsource.altera.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh@...nel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-spi@...r.kernel.org, Clifford Wolf <clifford@...fford.at>
Subject: Re: [PATCH v8 3/3] fpga: Add support for Lattice iCE40 FPGAs

Marek,

On Mon, Nov 7, 2016 at 10:53 AM, Marek Vasut <marex@...x.de> wrote:

>> On the whole, I don't think the zero-length transfers are too
>> egregiously bad, and all the alternatives seem worse to me.
>
> So why not turn the CS line into GPIO and just toggle the GPIO?

Does that work with *all* SPI controllers?

Cheers,

Moritz