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

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Message-ID: <feae0954-7e85-3946-defe-ce252869786d@airwebreathe.org.uk>
Date:   Tue, 8 Nov 2016 10:30:54 -0700
From:   Joel Holdsworth <joel@...webreathe.org.uk>
To:     Moritz Fischer <moritz.fischer@...us.com>,
        Marek Vasut <marex@...x.de>
Cc:     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

>>> 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?
>

It does not - no. See my other email.