[PATCH v7 0/3] 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: Release the dfl mmio regions after enumeration, so that private
          feature drivers could request mmio region in their own drivers.
Patch #2: Introduce the dfl bus, then dfl devices could be supported by
          independent dfl drivers.
Patch #3: 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.

Main changes from v4:
- The patch "fpga: dfl: change data type of feature id to u16" is already
   applied to for-next
- Unify the naming of some functions in dfl.c
- Fix the output of fec_mode sysfs inf to "no" on 10G configuration, cause
   no FEC mode could be configured for 10G.
- Change the N3000 Nios driver name from "dfl-n3000-nios" to "n3000-nios",
   and also rename some structures and functions from dfl_n3000_nios_* to
   n3000_nios_*
- Minor fixes and comments improvement.

Main changes from v5:
- Fix the output of fec_mode sysfs inf to "not supported" if in 10G,
   or the firmware version major < 3.
- The input param of dfl_devs_add() changes to
   struct dfl_feature_platform_data.
- Minor fixes and improves comments.

Main changes from v6:
- Rebased to 5.9-rc1.
- Improves comments.

Xu Yilun (3):
  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   |  21 +
 Documentation/fpga/dfl-n3000-nios.rst              |  80 +++
 Documentation/fpga/index.rst                       |   1 +
 drivers/fpga/Kconfig                               |  11 +
 drivers/fpga/Makefile                              |   2 +
 drivers/fpga/dfl-n3000-nios.c                      | 542 +++++++++++++++++++++
 drivers/fpga/dfl-pci.c                             |  24 +-
 drivers/fpga/dfl.c                                 | 449 ++++++++++++++---
 drivers/fpga/dfl.h                                 |  93 +++-
 10 files changed, 1153 insertions(+), 85 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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