[PATCH v3 00/16] Enable upper layers using FPGA region w/o device tree

[Alan Tull]

* Change the fpga-mgr API to have one fpga_mgr_load function
  instead of three.

* Expose API functions for FPGA region

* Separate common FPGA region code from Device Tree support

* Add API functions for bridges where DT is not used.

This is needed because the current FPGA layer has a couple of problems:

* We now have 3 functions for programming a FPGA, depending on whether
the image is in a sg list, a buffer, or firmware.  So upper layers
have to be written assuming where the image will be or will have to
write extra code to maintain flexibility.

* users who aren't using device tree are left to write their
own code that is essentially a rewrite of FPGA region.

Currently on the linux-fpga git repo as branch
next-20170615-fpga-region-api-v3

Patch 1 updates documentation and adds a FPGA region API doc.

Patch 2 adds non-dt support for fpga-bridges

Patch 3 changes the FPGA manager API, replacing the 3 FPGA load
functions with a single function that can handle whether the image
is a sg list, a contiguous buffer, or a firmware file.

Patch 4 separates getting a ref to a manager from locking it so
code can hang onto a ref without preventing other users from
using the manager to program a FPGA.

Patches 5 to 16 separate FPGA region common code from DT overlay
support and adds API functions.  Functional code changes are separated
into a bunch of little patches.  The last patch actually moves code to
of-fpga-region.c with only minor init/probe changes as this becomes
two modules.

I've tested this functionally for all patches separately.

Code changes from v3 are pretty small.

Changes in v3:
* rewrite fpga-region.txt
* fix bisect, test on each patch
* change fpga_region_program_fpga take only the region as a parameter
* update docs for fpga_region_program_fpga change

Changes in v2:
* split the final (large) patch into smaller patches for easier reviewability.
* documentation has been expanded
* reorder things, clean up
* dev_err instead of pr_err
* move functions that alloc/free image info from fpga-region.c to fpga-mgr.c
* move fpga-region.h to include/linux/fpga/
* add fpga_region_class_find to fpga-region.c
* move of_fpga_region_find to of-fpga-region.c

Alan Tull (16):
  doc: fpga: update documents for the FPGA API
  fpga: bridge: support getting bridge from device
  fpga: mgr: API change to replace fpga load functions with single
    function
  fpga: mgr: separate getting/locking FPGA manager
  fpga: region: use dev_err instead of pr_err
  fpga: region: remove unneeded of_node_get and put
  fpga: region: get mgr early on
  fpga: region: check for child regions before allocing image info
  fpga: region: fix slow warning with more than one overlay
  fpga: region: use image info as parameter for programming region
  fpga: region: separate out code that parses the overlay
  fpga: region: add fpga-region.h header
  fpga: region: rename some functions prior to moving
  fpga: region: add register/unregister functions
  fpga: region: add fpga_region_class_find
  fpga: region: move device tree support to of-fpga-region.c

 Documentation/fpga/fpga-mgr.txt    | 133 +++++-----
 Documentation/fpga/fpga-region.txt |  95 +++++++
 Documentation/fpga/overview.txt    |  23 ++
 drivers/fpga/Kconfig               |  13 +-
 drivers/fpga/Makefile              |   1 +
 drivers/fpga/fpga-bridge.c         | 110 +++++++--
 drivers/fpga/fpga-mgr.c            | 111 +++++++--
 drivers/fpga/fpga-region.c         | 463 ++++------------------------------
 drivers/fpga/of-fpga-region.c      | 495 +++++++++++++++++++++++++++++++++++++
 include/linux/fpga/fpga-bridge.h   |   7 +-
 include/linux/fpga/fpga-mgr.h      |  29 ++-
 include/linux/fpga/fpga-region.h   |  38 +++
 12 files changed, 975 insertions(+), 543 deletions(-)
 create mode 100644 Documentation/fpga/fpga-region.txt
 create mode 100644 Documentation/fpga/overview.txt
 create mode 100644 drivers/fpga/of-fpga-region.c
 create mode 100644 include/linux/fpga/fpga-region.h

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