PCI: rockchip: Modularize

Now that we've exported pci_remap_iospace() and added proper remove()
support, there's no reason this can't be a loadable module.
Signed-off-by: NBrian Norris <briannorris@chromium.org>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Lin <shawn.lin@rock-chips.com>

drivers/pci/host/Kconfig

@@ -164,7 +164,7 @@ config PCI_HOST_THUNDER_ECAM
 	  Say Y here if you want ECAM support for CN88XX-Pass-1.x Cavium Thunder SoCs.
 
 config PCIE_ROCKCHIP
-	bool "Rockchip PCIe controller"
+	tristate "Rockchip PCIe controller"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST
 	depends on OF
 	depends on PCI_MSI_IRQ_DOMAIN

drivers/pci/host/pcie-rockchip.c

@@ -26,6 +26,7 @@
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_pci.h>
@@ -1468,6 +1469,7 @@ static const struct of_device_id rockchip_pcie_of_match[] = {
 	{ .compatible = "rockchip,rk3399-pcie", },
 	{}
 };
+MODULE_DEVICE_TABLE(of, rockchip_pcie_of_match);
 
 static struct platform_driver rockchip_pcie_driver = {
 	.driver = {
@@ -1478,4 +1480,8 @@ static struct platform_driver rockchip_pcie_driver = {
 	.probe = rockchip_pcie_probe,
 	.remove = rockchip_pcie_remove,
 };
-builtin_platform_driver(rockchip_pcie_driver);
+module_platform_driver(rockchip_pcie_driver);
+
+MODULE_AUTHOR("Rockchip Inc");
+MODULE_DESCRIPTION("Rockchip AXI PCIe driver");
+MODULE_LICENSE("GPL v2");