* ARM Versatile Platform Baseboard PCI interface

PCI host controller found on the ARM Versatile PB board's FPGA.

Required properties:
- compatible: should contain "arm,versatile-pci" to identify the Versatile PCI
  controller.
- reg: base addresses and lengths of the pci controller. There must be 3
  entries:
	- Versatile-specific registers
	- Self Config space
	- Config space
- #address-cells: set to <3>
- #size-cells: set to <2>
- device_type: set to "pci"
- bus-range: set to <0 0xff>
- ranges: ranges for the PCI memory and I/O regions
- #interrupt-cells: set to <1>
- interrupt-map-mask and interrupt-map: standard PCI properties to define
	the mapping of the PCI interface to interrupt numbers.

Example:

pci-controller@10001000 {
	compatible = "arm,versatile-pci";
	device_type = "pci";
	reg = <0x10001000 0x1000
	       0x41000000 0x10000
	       0x42000000 0x100000>;
	bus-range = <0 0xff>;
	#address-cells = <3>;
	#size-cells = <2>;
	#interrupt-cells = <1>;

	ranges = <0x01000000 0 0x00000000 0x43000000 0 0x00010000   /* downstream I/O */
		  0x02000000 0 0x50000000 0x50000000 0 0x10000000   /* non-prefetchable memory */
		  0x42000000 0 0x60000000 0x60000000 0 0x10000000>; /* prefetchable memory */

	interrupt-map-mask = <0x1800 0 0 7>;
	interrupt-map = <0x1800 0 0 1 &sic 28
			 0x1800 0 0 2 &sic 29
			 0x1800 0 0 3 &sic 30
			 0x1800 0 0 4 &sic 27

			 0x1000 0 0 1 &sic 27
			 0x1000 0 0 2 &sic 28
			 0x1000 0 0 3 &sic 29
			 0x1000 0 0 4 &sic 30

			 0x0800 0 0 1 &sic 30
			 0x0800 0 0 2 &sic 27
			 0x0800 0 0 3 &sic 28
			 0x0800 0 0 4 &sic 29

			 0x0000 0 0 1 &sic 29
			 0x0000 0 0 2 &sic 30
			 0x0000 0 0 3 &sic 27
			 0x0000 0 0 4 &sic 28>;
};