Add endpoint driver for Rockchip PCIe controller

Patch 1 firstly move the whole Rockchip PCIe host driver from drivers/pci/host to a new folder, driver/pci/rockchip/, and rename pcie-rockchip.c to pcie-rockchip-host.c. It also update the Kconfig/Makefile etc to repect this change.

Then patch 2 and patch 3 are trying to spilt out some common code in preparation for adding endponit controller driver support.

Patch 4 rename rockchip-pcie.txt to rockchip-pcie-host.txt.

Patch 5 adds endpoint controller driver support as well as the new documentation, rockchip-pcie-ep.txt, introduced by patch 6.

Changes in v2:
- remove rockchip,rk3399-pcie-host compatible(Suggested by Rob)
- fix some error handling

Shawn Lin (6):
PCI: rockchip: Create individual folder for rockchip drivers
PCI: rockchip: Split out common function to parse DT
PCI: rockchip: Spilt out common function to init controller
dt-bindings: PCI: rockchip: Rename rockchip-pcie.txt to
rockchip-pcie-host.txt
PCI: rockchip: Add Endpoint controller driver for Rockchip PCIe
controller
dt-bindings: PCI: rockchip: Add DT bindings for Rockchip PCIe endpoint
controller

  .../devicetree/bindings/pci/rockchip-pcie-ep.txt   |  62 ++
  .../{rockchip-pcie.txt => rockchip-pcie-host.txt}  |   0
  MAINTAINERS                                        |   4 +-
  drivers/pci/Kconfig                                |   1 +
  drivers/pci/Makefile                               |   2 +
  drivers/pci/host/Kconfig                           |  11 -
  drivers/pci/host/Makefile                          |   1 -
  drivers/pci/rockchip/Kconfig                       |  32 +
  drivers/pci/rockchip/Makefile                      |   4 +
  drivers/pci/rockchip/pcie-rockchip-ep.c            | 641 +++++++++++++++++++++
  .../pcie-rockchip-host.c}                          | 594 +------------------
  drivers/pci/rockchip/pcie-rockchip.c               | 417 ++++++++++++++
  drivers/pci/rockchip/pcie-rockchip.h               | 343 +++++++++++
  13 files changed, 1517 insertions(+), 595 deletions(-)

create mode 100644 Documentation/devicetree/bindings/pci/rockchip-pcie-ep.txt rename Documentation/devicetree/bindings/pci/{rockchip-pcie.txt => rockchip-pcie-host.txt} (100%) create mode 100644 drivers/pci/rockchip/Kconfig
create mode 100644 drivers/pci/rockchip/Makefile
create mode 100644 drivers/pci/rockchip/pcie-rockchip-ep.c
rename drivers/pci/{host/pcie-rockchip.c => rockchip/pcie-rockchip-host.c} (61%) create mode 100644 drivers/pci/rockchip/pcie-rockchip.c
create mode 100644 drivers/pci/rockchip/pcie-rockchip.h