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

[Brian Norris]

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 at micron.com>
> Acked-by: Marek Vasut <marex at denx.de>

Pushed to l2-mtd.git. Thanks.

Brian