• Yogesh Narayan Gaur's avatar
    spi: spi-mem: Add driver for NXP FlexSPI controller · a5356aef
    Yogesh Narayan Gaur authored and Mark Brown's avatar Mark Brown committed
    
    
    - Add driver for NXP FlexSPI host controller
    
    (0) What is the FlexSPI controller?
     FlexSPI is a flexsible SPI host controller which supports two SPI
     channels and up to 4 external devices. Each channel supports
     Single/Dual/Quad/Octal mode data transfer (1/2/4/8 bidirectional
     data lines) i.e. FlexSPI acts as an interface to external devices,
     maximum 4, each with up to 8 bidirectional data lines.
    
     It uses new SPI memory interface of the SPI framework to issue
     flash memory operations to up to four connected flash
     devices (2 buses with 2 CS each).
    
    (1) Tested this driver with the mtd_debug and JFFS2 filesystem utility
     on NXP LX2160ARDB and LX2160AQDS targets.
     LX2160ARDB is having two NOR slave device connected on single bus A
     i.e. A0 and A1 (CS0 and CS1).
     LX2160AQDS is having two NOR slave device connected on separate buses
     one flash on A0 and second on B1 i.e. (CS0 and CS3).
     Verified this driver on following SPI NOR flashes:
        Micron, mt35xu512ab, [Read - 1 bit mode]
        Cypress, s25fl512s, [Read - 1/2/4 bit mode]
    
    Signed-off-by: default avatarYogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
    Reviewed-by: default avatarFrieder Schrempf <frieder.schrempf@kontron.de>
    Reviewed-by: default avatarBoris Brezillon <bbrezillon@kernel.org>
    Tested-by: default avatarAshish Kumar <Ashish.Kumar@nxp.com>
    Signed-off-by: Mark Brown's avatarMark Brown <broonie@kernel.org>
    a5356aef