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

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Message-ID: <f7917987-a4cb-2840-8128-07eebd242c17@denx.de>
Date:   Wed, 9 Nov 2016 13:01:56 +0100
From:   Marek Vasut <marex@...x.de>
To:     Joel Holdsworth <joel@...webreathe.org.uk>,
        Moritz Fischer <moritz.fischer@...us.com>
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 11/08/2016 06:30 PM, Joel Holdsworth 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?
>>
> 
> It does not - no. See my other email.

And is that line an actual CS of that lattice chip or a generic input
which almost works like CS?

-- 
Best regards,
Marek Vasut