linux-kernel - Re: [linux-sunxi] [PATCH 3/3] MTD: m25p80: Add option to limit SPI transfer size.

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Message-ID: <CAGRGNgXKrpJ8rc4h4BykgHsn3kfT5fuAssMK1bQJtxhVL=s2BA@mail.gmail.com>
Date:	Fri, 1 May 2015 00:58:52 +1000
From:	Julian Calaby <julian.calaby@...il.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Marek Vasut <marex@...x.de>,
	Huang Shijie <b32955@...escale.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Alison Chaiken <alison_chaiken@...tor.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>, "grmoore@...era.com" <grmoore@...era.com>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org
Subject: Re: [linux-sunxi] [PATCH 3/3] MTD: m25p80: Add option to limit SPI
 transfer size.

Hi Michal,

On Thu, Apr 30, 2015 at 11:46 PM, Michal Suchanek <hramrach@...il.com> wrote:
> My SPI driver does not support DMA so sizes larger than 64 bytes return
> an error. Add an option to limit transfer size so m25p80 can be used
> with reduced speed with such controller.

I suspect that this will be rejected as the maximum transfer size is a
property of the SPI controller, not the device and should be exported
to the device driver from the controller, not specified in the
device's binding.

Thanks,

-- 
Julian Calaby

Email: julian.calaby@...il.com
Profile: http://www.google.com/profiles/julian.calaby/
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