linux-kernel - Re: [PATCH 2/3] mtd: davinci-nand: add dts property for NAND_NO_SUBPAGE

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Date:	Thu, 20 Mar 2014 11:54:52 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Warner Losh <imp@...imp.com>,
	Ivan Khoronzhuk <ivan.khoronzhuk@...com>,
	David Woodhouse <dwmw2@...radead.org>, galak@...eaurora.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, rob@...dley.net,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	grygorii.strashko@...com, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mtd@...ts.infradead.org,
	Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH 2/3] mtd: davinci-nand: add dts property for
 NAND_NO_SUBPAGE_WRITE option

On Thu, Mar 20, 2014 at 02:02:39PM -0400, Santosh Shilimkar wrote:
> On Thursday 20 March 2014 01:44 PM, Warner Losh wrote:
> > I though sub page writing was one of the fields in the onfi and/or jedec(toggle) meta data structures. Have you looked there?
> > 
> Am not sure if I follow you. The limitation is from the TI NAND controller(AEMIF) and
> not the NAND memory. 

That doesn't match the patch description, which says "that flash doesn't
support subpage writing". Flash != flash controller.

Which one is it? If it's a controller limitation, I think we should be
able to pull this from a "compatible" property, no?

Brian
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