Altera Cyclone Passive Serial SPI FPGA Manager

This series adds an FPGA manager for Altera cyclone FPGAs
that can program them using an spi port and a couple of gpios, using
Alteras passive serial protocol.

Changes from v3:
- Fixed up the state() function to return the state of the status pin
  reqested by Alan Tull
- Switched the pin to ACTIVE_LOW and coresponding logic level, and updated
  the corresponding documentation. Thanks Rob Herring for pointing out my
  mistake.
- Per Rob Herring, switched from "gpio" to "gpios" in dts

Changes from v2:
- Merged patch 3 and 4 as suggested in review by Moritz Fischer
- Changed FPGA_MIN_DELAY from 250 to 50 ms is the time advertized by
  Altera. This now works, as we don't assume it is done

Changes from v1:
- Changed the name from cyclone-spi-fpga-mgr to cyclone-ps-spi-fpga-mgr
  This name change was requested by Alan Tull, to be specific about which
  programming method is being employed on the fpga.
- Changed the name of the reset-gpio to config-gpio to closer match the
  way the pins are described in the Altera manual
- Moved MODULE_LICENCE, _AUTHOR, and _DESCRIPTION to the bottom

- Added a bitrev8x4() function to the bitrev headers and implemented ARM
 const, runtime, and ARM specific faster versions (This may end up
 needing to be a standalone patch)

- Moved the bitswapping into cyclonespi_write(), as requested.
  This falls short of my desired generic lsb first spi support, but is a step
  in that direction.

- Fixed whitespace problems introduced during refactoring

- Replaced magic number for initial delay with a descriptive macro
- Poll the fpga to see when it is ready rather than a fixed 1 ms sleep

Joshua Clayton (3):
  lib: add bitrev8x4()
  doc: dt: add cyclone-spi binding document
  fpga manager: Add cyclone-ps-spi driver for Altera FPGAs

 .../bindings/fpga/cyclone-ps-spi-fpga-mgr.txt      |  25 +++
 arch/arm/include/asm/bitrev.h                      |   5 +
 drivers/fpga/Kconfig                               |   7 +
 drivers/fpga/Makefile                              |   1 +
 drivers/fpga/cyclone-ps-spi.c                      | 181 +++++++++++++++++++++
 include/linux/bitrev.h                             |  26 +++
 6 files changed, 245 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/cyclone-ps-spi-fpga-mgr.txt
 create mode 100644 drivers/fpga/cyclone-ps-spi.c

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2.9.3