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References: <cover.1430403750.git.hramrach@gmail.com> <OF23B05612.4290AF80-ONC1257E37.00589292-C1257E37.005AB106@rohde-schwarz.com>
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 30 Apr 2015 18:56:18 +0200
Message-ID: <CAOMqctRLnCJfVCYGjsmhORYNk+HCf07wwSXnZv4oqDxbaQqKGw@mail.gmail.com>
Subject: Re: [PATCH 0/3] Using SPI NOR flah on sunxi.
To: Thomas.Betker@rohde-schwarz.com
Cc: Alison Chaiken <alison_chaiken@mentor.com>,
        Huang Shijie <b32955@freescale.com>,
        "Bean Huo ????????? (beanhuo)" <beanhuo@micron.com>,
        Ben Hutchings <ben@decadent.org.uk>,
        Brian Norris <computersforpeace@gmail.com>,
        devicetree <devicetree@vger.kernel.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Kumar Gala <galak@codeaurora.org>,
        "grmoore@altera.com" <grmoore@altera.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-mtd@lists.infradead.org,
        linux-mtd <linux-mtd-bounces@lists.infradead.org>,
        linux-sunxi <linux-sunxi@googlegroups.com>,
        Marek Vasut <marex@denx.de>, Mark Rutland <mark.rutland@arm.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Pawel Moll <pawel.moll@arm.com>, Rob Herring <robh+dt@kernel.org>,
        "Rafa?? Mi??ecki" <zajec5@gmail.com>
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On 30 April 2015 at 18:30,  <Thomas.Betker@rohde-schwarz.com> wrote:
> Hello Michal:
>
>> I tried to connect a SPI NOR flash to my sunxi board and due to the
> current
>> sunxi SPI driver limitations it does not work.
>>
>> The SPI driver returns an error when more than 64 bytes are
>> transferred at once
>> due to lack of DMA support.
>
> Wouldn't it be easier to fix the SPI driver to handle transfers larger
> than 64 bytes, filling and draining the FIFO multiple times if neccessary?
> (As far as I can tell, most SPI drivers do this.)
>

Yes, the intent is to fix this by adding dma support to the driver, eventually.

The patch might be still useful for other hardware with developing SPI support.

Thanks

Michal
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