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Date: Wed, 20 May 2015 16:27:59 -0700
From: Brian Norris <computersforpeace@gmail.com>
To: Julian Calaby <julian.calaby@gmail.com>
Subject: Re: [linux-sunxi] [PATCH 3/3] MTD: m25p80: Add option to limit SPI
 transfer size.
Message-ID: <20150520232759.GW11598@ld-irv-0074>
References: <cover.1430403750.git.hramrach@gmail.com>
 <3b0c112672f364452e80c333048161eaffb655db.1430403750.git.hramrach@gmail.com>
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Cc: Mark Rutland <mark.rutland@arm.com>, Marek Vasut <marex@denx.de>,
 Michal Suchanek <hramrach@gmail.com>,
 Mika Westerberg <mika.westerberg@linux.intel.com>,
 "grmoore@altera.com" <grmoore@altera.com>, Pawel Moll <pawel.moll@arm.com>,
 Ian Campbell <ijc+devicetree@hellion.org.uk>,
 Ben Hutchings <ben@decadent.org.uk>,
 =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 Huang Shijie <b32955@freescale.com>,
 linux-sunxi <linux-sunxi@googlegroups.com>, Rob Herring <robh+dt@kernel.org>,
 linux-mtd@lists.infradead.org, Kumar Gala <galak@codeaurora.org>,
 David Woodhouse <dwmw2@infradead.org>,
 Alison Chaiken <alison_chaiken@mentor.com>,
 devicetree <devicetree@vger.kernel.org>,
 Bean Huo =?utf-8?B?6ZyN5paM5paMIChiZWFuaHVvKQ==?= <beanhuo@micron.com>
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On Fri, May 01, 2015 at 12:58:52AM +1000, Julian Calaby wrote:
> On Thu, Apr 30, 2015 at 11:46 PM, Michal Suchanek <hramrach@gmail.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.

Absolutely correct. This does not belong in the device tree.

Brian