[PATCH v4 0/4] Modularization of DFL private feature drivers

[Xu Yilun]

This patchset makes it possible to develop independent driver modules
for DFL private features. It also helps to leverage existing kernel
drivers to enable some IP blocks in DFL.

Patch #1: An improvement of feature id definition. The feature id will be
          used as the key field for dfl device/driver matching.
Patch #2: Release the dfl mmio regions after enumeration, so that private
          feature drivers could request mmio region in their own drivers.
Patch #3: Introduce the dfl bus, then dfl devices could be supported by
          independent dfl drivers.
Patch #4: An example of the dfl driver for N3000 nios private feature.


Main changes from v1:
- Add the new Patch #1, to improve the feature id definition.
- Change the dfl bus uevent format.
- Change the dfl device's sysfs name format.
- refactor dfl_dev_add()
- Add the Patch #4 as an example of the dfl driver.
- A lot of minor fixes for comments from Hao and Tom.

Main changes from v2:
- Add the doc for dfl-n3000-nios driver.
- Minor fixes for comments from Tom.

Main changes from v3:
- improve the dfl devices' uevent format, 4 bits for type & 12 bits for id
- change dfl_device->type to u8
- A dedicate field in struct dfl_feature for dfl device instance.
- error out if dfl_device already exist on dfl_devs_init().
- Move the err log in regmap implementation, and delete
  n3000_nios_writel/readl(), they have nothing to wrapper now.
- Minor fixes and comments improvement.

Xu Yilun (4):
  fpga: dfl: change data type of feature id to u16
  fpga: dfl: map feature mmio resources in their own feature drivers
  fpga: dfl: create a dfl bus type to support DFL devices
  fpga: dfl: add support for N3000 Nios private feature

 Documentation/ABI/testing/sysfs-bus-dfl            |  15 +
 .../ABI/testing/sysfs-bus-dfl-devices-n3000-nios   |  18 +
 Documentation/fpga/dfl-n3000-nios.rst              |  41 ++
 Documentation/fpga/index.rst                       |   1 +
 drivers/fpga/Kconfig                               |  12 +
 drivers/fpga/Makefile                              |   2 +
 drivers/fpga/dfl-fme-perf.c                        |   2 +-
 drivers/fpga/dfl-n3000-nios.c                      | 475 +++++++++++++++++++++
 drivers/fpga/dfl-pci.c                             |  24 +-
 drivers/fpga/dfl.c                                 | 473 ++++++++++++++++----
 drivers/fpga/dfl.h                                 | 102 ++++-
 11 files changed, 1062 insertions(+), 103 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-dfl
 create mode 100644 Documentation/ABI/testing/sysfs-bus-dfl-devices-n3000-nios
 create mode 100644 Documentation/fpga/dfl-n3000-nios.rst
 create mode 100644 drivers/fpga/dfl-n3000-nios.c

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2.7.4