xhci: hisilicon: support HiSilicon STB xHCI host controller

This commit adds support for HiSilicon STB xHCI host controller.
There are two xHCI host controllers on HiSilicon STB SoCs. Each
one requires additional configuration before exposing interface
compliant with xHCI.

Reviewed-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Jianguo Sun <sunjianguo1@huawei.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/Kconfig

@@ -52,6 +52,13 @@ config USB_XHCI_PLATFORM
 
 	  If unsure, say N.
 
+config USB_XHCI_HISTB
+	tristate "xHCI support for HiSilicon STB SoCs"
+	depends on USB_XHCI_PLATFORM && (ARCH_HISI || COMPILE_TEST)
+	help
+	  Say 'Y' to enable the support for the xHCI host controller
+	  found in HiSilicon STB SoCs.
+
 config USB_XHCI_MTK
 	tristate "xHCI support for MediaTek SoCs"
 	select MFD_SYSCON

drivers/usb/host/Makefile

@@ -74,6 +74,7 @@ obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
 obj-$(CONFIG_USB_XHCI_HCD)	+= xhci-hcd.o
 obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o
 obj-$(CONFIG_USB_XHCI_PLATFORM) += xhci-plat-hcd.o
+obj-$(CONFIG_USB_XHCI_HISTB)	+= xhci-histb.o
 obj-$(CONFIG_USB_XHCI_MTK)	+= xhci-mtk.o
 obj-$(CONFIG_USB_XHCI_TEGRA)	+= xhci-tegra.o
 obj-$(CONFIG_USB_SL811_HCD)	+= sl811-hcd.o