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    Subject[PATCH v6 0/2] UIO support for dfl devices
    This patchset supports some dfl device drivers written in userspace.

    In the patchset v1, the "driver_override" interface should be used to bind
    the DFL UIO driver to DFL devices. But there is concern that the
    "driver_override" interface is not OK itself.

    In v2, we use a new matching algorithem. The "driver_override" interface
    is abandoned, the DFL UIO driver matches any DFL device which could not be
    handled by other DFL drivers. So the DFL UIO driver could be used for new
    DFL devices which are not supported by kernel. The concern is the UIO may
    not be suitable as a default/generic driver for all dfl features, such as
    features with multiple interrupts.

    In v4, we specify each matching device in the id_table of the UIO driver,
    just the same as other dfl drivers do. Now the UIO driver supports Ether
    Group feature. To support more DFL features, their feature ids should be
    added to the driver's id_table.

    Main changes from v1:
    - switch to the new matching algorithem. It matches DFL devices which could
    not be handled by other DFL drivers.
    - refacor the code about device resources filling.
    - add the documentation.

    Main changes from v2:
    - split the match ops changes in dfl.c to an independent patch.
    - move the declarations needed for dfl-uio-pdev from include/linux/dfl.h
    to driver/fpga/dfl.h
    - some minor fixes.

    Main changes from v3:
    - switch to specifying each matching device in the driver's id_table.
    - refactor the irq handling code.

    Main changes from v4:
    - refactor the irq handling code.

    Main changes from v5:
    - fix the res[] zero initialization issue.
    - improve the return code for probe().
    - some doc improvement.

    Xu Yilun (2):
    fpga: dfl: add the userspace I/O device support for DFL devices
    Documentation: fpga: dfl: Add description for DFL UIO support

    Documentation/fpga/dfl.rst | 24 ++++++++++++
    drivers/fpga/Kconfig | 10 +++++
    drivers/fpga/Makefile | 1 +
    drivers/fpga/dfl-uio-pdev.c | 93 +++++++++++++++++++++++++++++++++++++++++++++
    4 files changed, 128 insertions(+)
    create mode 100644 drivers/fpga/dfl-uio-pdev.c


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