PCI: rockchip: Add EP driver for Rockchip PCIe controller

Add support for the Rockchip PCIe controller in endpoint mode;
it currently supports up to 32 regions with each region spanning
at least 1MB as per TRM.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

Author: shawn1221

drivers/pci/host/Kconfig

@@ -194,6 +194,18 @@ config PCIE_ROCKCHIP_HOST
 	  There is 1 internal PCIe port available to support GEN2 with
 	  4 slots.
 
+config PCIE_ROCKCHIP_EP
+	bool "Rockchip PCIe endpoint controller"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	depends on OF
+	depends on PCI_ENDPOINT
+	select MFD_SYSCON
+	select PCIE_ROCKCHIP
+	help
+	  Say Y here if you want to support Rockchip PCIe controller in
+	  endpoint mode on Rockchip SoC. There is 1 internal PCIe port
+	  available to support GEN2 with 4 slots.
+
 config PCIE_MEDIATEK
 	bool "MediaTek PCIe controller"
 	depends on (ARM || ARM64) && (ARCH_MEDIATEK || COMPILE_TEST)

drivers/pci/host/Makefile

@@ -20,6 +20,7 @@ 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_PCIE_ROCKCHIP) += pcie-rockchip.o
+obj-$(CONFIG_PCIE_ROCKCHIP_EP) += pcie-rockchip-ep.o
 obj-$(CONFIG_PCIE_ROCKCHIP_HOST) += pcie-rockchip-host.o
 obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
 obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o