drivers: mtd: m25p80: add quad read support
drivers: mtd: m25p80: add quad read support

Some flash also support quad read mode. Adding support for quad read
mode in m25p80 for Spansion and Macronix flash.

[Tweaked by Brian]

With this patch, quad-read support will override fast-read and
normal-read, if the SPI controller and flash chip both support it.

Signed-off-by: Sourav Poddar <622174b0059324e3873cdaa4bff5b59554c7d88a@ti.com>
Tested-by: Sourav Poddar <622174b0059324e3873cdaa4bff5b59554c7d88a@ti.com>
Reviewed-by: Marek Vasut <f40600653b33f5282fa4c5daf377dfc444fb4625@denx.de>
Signed-off-by: Brian Norris <ac73eed4b8a8c9127255a2696c52b2e7503720b8@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs