[v4,00/19] Add sbefifo backend

This patch set adds per backend support of hardware drivers.  The drivers
for targets in the system device tree which can be matched to the same
compatible string (e.g. ibm,power-thread) are assigned to specific
backend.  When looking up a driver for a target in device tree, first
lookup the specific backend and then the default backend.

All targets in backend device tree, use compatible properties that
describe the hardware access (e.g. ibm,bmcfsi).  There must be only
single compatible string assigned to targets in backend device trees.

All targets in system device tree, use compatible properties that describe
the hardware (ibm,power9-adu) and can have multiple compatible properties
(e.g. ibm,power-thread and ibm,power9-thread) to load different drivers
based on the backend.

For openbmc, all the hardware access is required to go via sbefifo.
Currently some of the operations are hacked in to go via sbefifo
(e.g. all thread operations).  This patchset removes temporary hacks
and adds infrastructure to create sbefifo backend.

Also fix couple of bugs in libsbefifo.

V2 changes:
  - Rebased on top of latest master
    (resolved conflicts and add missing code due to upstream changes)

V3 changes:
  - Compatible properties in system device tree updated as per defined
    convetion (mentioned above)

V4 changes:
  - When matching compatible property, search all strings at once
  - All backend drivers are registered to default backend
  - All system drivers with specific compatible string
    (e.g. ibm,power9-thread) are registered to default backend
  - Only system drivers with generic compatible string
    (e.g. ibm,power-thread) are registered to specific backend
  - Do not assume specific parent/child relationship for sbefifo, find
    the sbefifo target based on pib index

Amitay Isaacs (19):
  libsbefifo: Fix compilation error for undefined variable
  libsbefifo: Use the correct sized pointer
  libpdbg: Add a private api to get current backend
  libpdbg: Register hwunit drivers per backend
  libpdbg: Use PDBG_BACKEND_DRIVER to specify drivers to load
  libpdbg: Use const char * for filenames
  dts: Backend device trees must use specific driver
  dts: Rename ibm,processor -> ibm,power-proc
  dts: Add a generic compatible string for core and thread
  libpdbg: Add sbefifo backend
  libpdbg: Add pib driver using sbefifo
  libpdbg: Add thread driver using sbefifo
  libpdbg: Add all thread procedures to pib target
  libpdbg: Implement all thread procedures using sbefifo
  libpdbg: Remove special case thread procedures using sbefifo
  libpdbg: Drop thread procedures from chipop target
  dts: Add sbefifo backend device tree
  libpdbg: Enable sbefifo backend
  main: Add sbefifo backend

 Makefile.am               |   1 +
 libpdbg/adu.c             |   4 +-
 libpdbg/bmcfsi.c          |   2 +-
 libpdbg/cfam.c            |   8 +-
 libpdbg/chip.c            |  64 ++---
 libpdbg/cronus.c          |   6 +-
 libpdbg/device.c          |  15 +-
 libpdbg/dtb.c             |  28 ++-
 libpdbg/fake.c            |   8 +-
 libpdbg/host.c            |   2 +-
 libpdbg/htm.c             |   6 +-
 libpdbg/hwunit.c          |  86 ++++++-
 libpdbg/hwunit.h          |  13 +-
 libpdbg/i2c.c             |   2 +-
 libpdbg/kernel.c          |   4 +-
 libpdbg/libpdbg.h         |   7 +-
 libpdbg/p8chip.c          |   4 +-
 libpdbg/p9_fapi_targets.c |  52 ++--
 libpdbg/p9chip.c          |   4 +-
 libpdbg/sbefifo.c         | 181 ++++++++++++--
 libpdbg/target.h          |   1 +
 libsbefifo/cmd_scom.c     |   4 +-
 libsbefifo/operation.c    |   5 +-
 p8-fsi.dts.m4             |   6 +-
 p8-i2c.dts.m4             |   4 +-
 p8-kernel.dts.m4          |   4 +-
 p8.dts.m4                 |   2 +-
 p9-fsi.dtsi.m4            |   4 +-
 p9-sbefifo.dts.m4         |  86 +++++++
 p9.dts                    | 484 +++++++++++++++++++-------------------
 src/main.c                |   3 +
 31 files changed, 696 insertions(+), 404 deletions(-)
 create mode 100644 p9-sbefifo.dts.m4