linux-kernel - Re: [V7 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for Micron spi nor

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Date:	Wed, 7 Jan 2015 11:36:07 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>
Cc:	Marek Vasut <marex@...x.de>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"shijie8@...il.com" <shijie8@...il.com>,
	"geert+renesas@...der.be" <geert+renesas@...der.be>,
	"grmoore@...era.com" <grmoore@...era.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [V7 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for
 Micron spi nor

On Wed, Dec 17, 2014 at 07:35:45AM +0000, Bean Huo 霍斌斌 (beanhuo) wrote:
> This patch adds code which enables Quad I/O mode on Micron SPI NOR flashes.
> 
> For Micron SPI NOR flash, enabling or disabling quad I/O protocol can be done
> By two methods, which are to use EVCR(Enhanced Volatile Configuration Register)
> and the ENTER QUAD I/O MODE command. There is no difference between these two
> methods. Unfortunately, for some Micron spi nor flashes, there no ENTER Quad I/O
> command(35h),such as n25q064.But for all current Micron spi nor, if it support
> quad I/O mode, using EVCR definitely be supported. It is a recommended method to
> enable Quad I/O mode by EVCR, Quad I/O protocol bit 7.When EVCR bit 7 is reset
> to 0,the SPI NOR flash will operate in quad I/O mode.
> 
> This patch has been tested on N25Q512A and MT25TL256BAA1ESF.Micron spi nor of
> spi_nor_ids[] table all support this method.
> 
> Signed-off-by: bean huo <beanhuo@...ron.com>
> Acked-by: Marek Vasut <marex@...x.de>

Pushed to l2-mtd.git. Thanks.

Brian
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