PCI: amlogic: Add the Amlogic Meson PCIe controller driver

The Amlogic Meson PCIe host controller is based on the Synopsys DesignWare
PCI core. This patch adds the driver support for Meson PCIe controller.

Link: https://lore.kernel.org/linux-pci/20181218224708.GB22610@google.com/
Signed-off-by: Yue Wang <yue.wang@amlogic.com>
Signed-off-by: Hanjie Lin <hanjie.lin@amlogic.com>
[lorenzo.pieralisi@arm.com: updated coding/comment style]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

MAINTAINERS

@@ -11509,6 +11509,13 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git/
 S:	Supported
 F:	drivers/pci/controller/
 
+PCIE DRIVER FOR AMLOGIC MESON
+M:	Yue Wang <yue.wang@Amlogic.com>
+L:	linux-pci@vger.kernel.org
+L:	linux-amlogic@lists.infradead.org
+S:	Maintained
+F:	drivers/pci/controller/dwc/pci-meson.c
+
 PCIE DRIVER FOR AXIS ARTPEC
 M:	Jesper Nilsson <jesper.nilsson@axis.com>
 L:	linux-arm-kernel@axis.com

drivers/pci/controller/dwc/Kconfig

@@ -193,4 +193,14 @@ config PCIE_HISI_STB
 	help
           Say Y here if you want PCIe controller support on HiSilicon STB SoCs
 
+config PCI_MESON
+	bool "MESON PCIe controller"
+	depends on PCI_MSI_IRQ_DOMAIN
+	select PCIE_DW_HOST
+	help
+	  Say Y here if you want to enable PCI controller support on Amlogic
+	  SoCs. The PCI controller on Amlogic is based on DesignWare hardware
+	  and therefore the driver re-uses the DesignWare core functions to
+	  implement the driver.
+
 endmenu

drivers/pci/controller/dwc/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
 obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
 obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
+obj-$(CONFIG_PCI_MESON) += pci-meson.o
 
 # The following drivers are for devices that use the generic ACPI
 # pci_root.c driver but don't support standard ECAM config access.