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    SubjectRe: [PATCH 0/7] spi: spi-mem: Add a driver for NXP FlexSPI controller
    Hi Yogesh,

    On Fri, 31 Aug 2018 15:59:57 +0530
    Yogesh Gaur <yogeshnarayan.gaur@nxp.com> wrote:

    > - Add a driver for NXP FlexSPI host controller
    >
    > FlexSPI is a flexsible SPI host controller [1], Chapter 30 page 1475,
    > 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.
    >
    > FlexSPI controller is similar to the existing Freescale/NXP QuadSPI
    > controller with advanced features.
    >
    > - Tested this driver with mtd_debug(Erase/Write/Read) utility and JFFS2
    > filesystem mounting and booting on NXP LX2160ARDB[2] 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, mt35xu512aba[3], [Read - 1 bit mode]
    > Cypress, s25fl512s, [Read - 1/2/4 bit mode]
    >
    > Patch 1 adds variable size in spi_device struct, to save the
    > size of connected slave device.
    > Patch 2 adds flags for octal I/O data transfer.
    > Support for octal flash commands and other framework changes would going to be done in different
    > patch set.
    > Patch 3 adds a driver for the NXP FlexSPI controller, driver is based on
    > new spi-mem framework.

    Can we please omit octa mode support for now and focus on
    single/dual/quad SPI support? That is, drop patch 2, and do not set the
    OCTAL flags in patch 3.

    Regards,

    Boris

    > Patch 4 add binding file for this driver.
    > Patch 5 add device node property for FlexSPI driver for lx2160 SoC.
    > Patch 6 enables the config option.
    > Patch 7 add MAINTAINERS file.
    >
    > [1] https://www.nxp.com/docs/en/reference-manual/IMXRT1050RM.pdf
    > [2] https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=9721
    > [3] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=63445
    >
    > This series adds below patches:
    > Yogesh Gaur (7):
    > spi: add slave device size in spi_device struct
    > spi: add flags for octal I/O data transfer
    > spi: spi-mem: Add a driver for NXP FlexSPI controller
    > dt-bindings: spi: add binding file for NXP FlexSPI driver
    > arm64: dts: lx2160a: add fspi node property
    > arm64: defconfig: enable NXP FlexSPI driver
    > MAINTAINERS: add maintainers for the NXP FlexSPI driver
    >
    > .../devicetree/bindings/spi/spi-nxp-fspi.txt | 42 +
    > MAINTAINERS | 6 +
    > arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts | 21 +
    > arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi | 12 +
    > arch/arm64/configs/defconfig | 1 +
    > drivers/mtd/devices/m25p80.c | 6 +
    > drivers/mtd/spi-nor/spi-nor.c | 2 +
    > drivers/spi/Kconfig | 10 +
    > drivers/spi/Makefile | 1 +
    > drivers/spi/spi-nxp-fspi.c | 1242 ++++++++++++++++++++
    > include/linux/spi/spi.h | 4 +
    > 11 files changed, 1347 insertions(+)
    > create mode 100644 Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
    > create mode 100644 drivers/spi/spi-nxp-fspi.c
    >

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