pci: Add PCIe driver for Rockchip Soc

RK3399 has a PCIe controller which can be used as Root Complex.
This driver supports a PCIe controller as Root Complex mode.

Change-Id: Ifff7340bd90b7e9e17c9f500938bee7769785cb9
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

drivers/pci/host/Kconfig

@@ -173,4 +173,16 @@ config PCI_HISI
 	help
 	  Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC
 
+config PCIE_ROCKCHIP
+	bool "Rockchip PCIe controller"
+	depends on ARM64 && ARCH_ROCKCHIP
+	depends on OF
+	select MFD_SYSCON
+	select PCI_MSI
+	select PCI_MSI_IRQ_DOMAIN
+	help
+	  Say Y here if you want internal PCI support on Rockchip SoC.
+	  There are 1 internal PCIe port available to support GEN2 with
+	  4 slots.
+
 endmenu

drivers/pci/host/Makefile

@@ -20,3 +20,4 @@ obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
 obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
 obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o
 obj-$(CONFIG_PCI_HISI) += pcie-hisi.o
+obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o