* Amazon Annapurna Labs PCIe host bridge

Amazon's Annapurna Labs PCIe Host Controller is based on the Synopsys DesignWare
PCI core. It inherits common properties defined in
Documentation/devicetree/bindings/pci/designware-pcie.txt.

Properties of the host controller node that differ from it are:

- compatible:
	Usage: required
	Value type: <stringlist>
	Definition: Value should contain
			- "amazon,al-alpine-v2-pcie" for alpine_v2
			- "amazon,al-alpine-v3-pcie" for alpine_v3

- reg:
	Usage: required
	Value type: <prop-encoded-array>
	Definition: Register ranges as listed in the reg-names property

- reg-names:
	Usage: required
	Value type: <stringlist>
	Definition: Must include the following entries
			- "config"	PCIe ECAM space
			- "controller"	AL proprietary registers
			- "dbi"		Designware PCIe registers

Example:

	pcie-external0: pcie@fb600000 {
		compatible = "amazon,al-alpine-v3-pcie";
		reg = <0x0 0xfb600000 0x0 0x00100000
		       0x0 0xfd800000 0x0 0x00010000
		       0x0 0xfd810000 0x0 0x00001000>;
		reg-names = "config", "controller", "dbi";
		bus-range = <0 255>;
		device_type = "pci";
		#address-cells = <3>;
		#size-cells = <2>;
		#interrupt-cells = <1>;
		interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-map-mask = <0x00 0 0 7>;
		interrupt-map = <0x0000 0 0 1 &gic GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>; /* INTa */
		ranges = <0x02000000 0x0 0xc0010000 0x0 0xc0010000 0x0 0x07ff0000>;
	};