usb: host: xhci-plat: add support for the R-Car M2-N and H3 xHCI controllers

This patch set adds support for R-Car M2-N (r8a7793) and H3 (r8a7795) xHCI controllers. To add support these new SoCs, this patch set adds a new member "priv" in struct xhci_hcd.

This patch is based on the latest usb.git / usb-next branch. (The commit id = 0bbc367e21bfeea33230d893be4fa3a3ff9bcb48)

Changes from v3:
- Fix subject and description in patch 1.

Changes from v2:
- Rebase the latest usb-next branch (commit id = 0bbc367e21bfeea33230d)
- Modify hcd_priv_size and extra_priv_size in xhci.c and xhci-{plat,pci}.c as a clean-up patch.
- Change "priv" of struct xhci_hcd from const pointer to priv[0].

Changes from v1:
- Add "const void *priv" in struct xhci_hcd to simplify the code to match platform specific variables using of_device_id.data.
To achieve this purpose, this patch set made patch 1 to 3.

Yoshihiro Shimoda (7):
usb: host: xhci: cleanup hcd private size
usb: host: xhci: add a platform-private field
usb: host: xhci-plat: add struct xhci_plat_priv
usb: host: xhci-plat: add firmware_name in xhci_plat_priv
usb: host: xhci-rcar: Change code for new SoCs
usb: host: xhci-plat: add support for the R-Car M2-N xHCI controller
usb: host: xhci-plat: add support for the R-Car H3 xHCI controllers

  Documentation/devicetree/bindings/usb/usb-xhci.txt |  4 +-
  drivers/usb/host/xhci-pci.c                        |  1 -
  drivers/usb/host/xhci-plat.c                       | 88 +++++++++++++++-------
  drivers/usb/host/xhci-plat.h                       | 39 ++++++++++
  drivers/usb/host/xhci-rcar.c                       | 44 +++++++----
  drivers/usb/host/xhci-rcar.h                       |  3 +
  drivers/usb/host/xhci.c                            |  2 +-
  drivers/usb/host/xhci.h                            |  3 +
  8 files changed, 140 insertions(+), 44 deletions(-)

create mode 100644 drivers/usb/host/xhci-plat.h