From: Joel Holdsworth <joel@airwebreathe.org.uk>
To: Moritz Fischer <moritz.fischer@ettus.com>, Marek Vasut <marex@denx.de>
Cc: Alan Tull <atull@opensource.altera.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Rob Herring <robh@kernel.org>,
Devicetree List <devicetree@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-spi@vger.kernel.org, Clifford Wolf <clifford@clifford.at>
Subject: Re: [PATCH v8 3/3] fpga: Add support for Lattice iCE40 FPGAs
Date: Tue, 8 Nov 2016 10:30:54 -0700 [thread overview]
Message-ID: <feae0954-7e85-3946-defe-ce252869786d@airwebreathe.org.uk> (raw)
In-Reply-To: <CAAtXAHe_pz=oUpeP+t-Fy0z88LMmTeSffkD2Cbun3r+uTnmGYw@mail.gmail.com>
>>> 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.
WARNING: multiple messages have this Message-ID (diff)
From: Joel Holdsworth <joel-IJEoVVyKhCJXvIrf17iDB/XRex20P6io@public.gmane.org>
To: Moritz Fischer
<moritz.fischer-+aYTwkv1SeIAvxtiuMwx3w@public.gmane.org>,
Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>
Cc: Alan Tull
<atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org>,
Geert Uytterhoeven
<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>,
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Devicetree List
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Clifford Wolf <clifford-cPpHkPqGOEfk7+2FdBfRIA@public.gmane.org>
Subject: Re: [PATCH v8 3/3] fpga: Add support for Lattice iCE40 FPGAs
Date: Tue, 8 Nov 2016 10:30:54 -0700 [thread overview]
Message-ID: <feae0954-7e85-3946-defe-ce252869786d@airwebreathe.org.uk> (raw)
In-Reply-To: <CAAtXAHe_pz=oUpeP+t-Fy0z88LMmTeSffkD2Cbun3r+uTnmGYw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
>>> 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.
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next prev parent reply other threads:[~2016-11-08 17:31 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-07 2:49 [PATCH v8 1/3] of: Add vendor prefix for Lattice Semiconductor Joel Holdsworth
2016-11-07 2:49 ` Joel Holdsworth
2016-11-07 2:49 ` [PATCH v8 2/3] Documentation: Add binding document for Lattice iCE40 FPGA manager Joel Holdsworth
2016-11-07 17:53 ` Marek Vasut
2016-11-07 17:53 ` Marek Vasut
2016-11-07 18:57 ` Joel Holdsworth
2016-11-14 16:11 ` Rob Herring
2016-11-18 18:56 ` atull
2016-11-18 18:56 ` atull
2016-11-18 19:17 ` Moritz Fischer
2016-11-18 19:17 ` Moritz Fischer
2016-11-18 19:28 ` Marek Vasut
2016-11-18 19:28 ` Marek Vasut
2016-11-07 2:49 ` [PATCH v8 3/3] fpga: Add support for Lattice iCE40 FPGAs Joel Holdsworth
2016-11-07 2:49 ` Joel Holdsworth
2016-11-07 18:01 ` Marek Vasut
2016-11-07 18:01 ` Marek Vasut
2016-11-07 18:49 ` Joel Holdsworth
2016-11-07 18:49 ` Joel Holdsworth
2016-11-07 18:53 ` Marek Vasut
2016-11-08 17:06 ` Moritz Fischer
2016-11-08 17:30 ` Joel Holdsworth [this message]
2016-11-08 17:30 ` Joel Holdsworth
2016-11-09 12:01 ` Marek Vasut
2016-11-09 18:37 ` Joel Holdsworth
2016-11-09 18:39 ` Marek Vasut
2016-11-09 18:54 ` Joel Holdsworth
2016-11-09 18:54 ` Joel Holdsworth
2016-11-10 12:11 ` Marek Vasut
2016-11-10 12:11 ` Marek Vasut
2016-11-08 17:13 ` Joel Holdsworth
2016-11-08 17:13 ` Joel Holdsworth
2016-11-07 18:26 ` Moritz Fischer
2016-11-07 18:26 ` Moritz Fischer
2016-11-07 19:02 ` Joel Holdsworth
2016-11-07 19:02 ` Joel Holdsworth
2016-11-07 21:41 ` Moritz Fischer
2016-11-07 21:41 ` Moritz Fischer
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