* Samsung Exynos 5440 PCIe interface

This PCIe host controller is based on the Synopsis Designware PCIe IP
and thus inherits all the common properties defined in designware-pcie.txt.

Required properties:
- compatible: "samsung,exynos5440-pcie"
- reg: base addresses and lengths of the pcie controller,
	the phy controller, additional register for the phy controller.
	(Registers for the phy controller are DEPRECATED.
	 Use the PHY framework.)
- reg-names : First name should be set to "elbi".
	And use the "config" instead of getting the confgiruation address space
	from "ranges".
	NOTE: When use the "config" property, reg-names must be set.
- interrupts: A list of interrupt outputs for level interrupt,
	pulse interrupt, special interrupt.
- phys: From PHY binding. Phandle for the Generic PHY.
	Refer to Documentation/devicetree/bindings/phy/samsung-phy.txt

Other common properties refer to
	Documentation/devicetree/binding/pci/designware-pcie.txt

Example:

SoC specific DT Entry:

	pcie@290000 {
		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
		reg = <0x290000 0x1000
			0x270000 0x1000
			0x271000 0x40>;
		interrupts = <0 20 0>, <0 21 0>, <0 22 0>;
		clocks = <&clock 28>, <&clock 27>;
		clock-names = "pcie", "pcie_bus";
		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		ranges = <0x00000800 0 0x40000000 0x40000000 0 0x00001000   /* configuration space */
			  0x81000000 0 0	  0x40001000 0 0x00010000   /* downstream I/O */
			  0x82000000 0 0x40011000 0x40011000 0 0x1ffef000>; /* non-prefetchable memory */
		#interrupt-cells = <1>;
		interrupt-map-mask = <0 0 0 0>;
		interrupt-map = <0 0 0 0 &gic GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
		num-lanes = <4>;
	};

	pcie@2a0000 {
		compatible = "samsung,exynos5440-pcie", "snps,dw-pcie";
		reg = <0x2a0000 0x1000
			0x272000 0x1000
			0x271040 0x40>;
		interrupts = <0 23 0>, <0 24 0>, <0 25 0>;
		clocks = <&clock 29>, <&clock 27>;
		clock-names = "pcie", "pcie_bus";
		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		ranges = <0x00000800 0 0x60000000 0x60000000 0 0x00001000   /* configuration space */
			  0x81000000 0 0	  0x60001000 0 0x00010000   /* downstream I/O */
			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>; /* non-prefetchable memory */
		#interrupt-cells = <1>;
		interrupt-map-mask = <0 0 0 0>;
		interrupt-map = <0 0 0 0 &gic GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>;
		num-lanes = <4>;
	};

With using PHY framework:
	pcie_phy0: pcie-phy@270000 {
		...
		reg = <0x270000 0x1000>, <0x271000 0x40>;
		reg-names = "phy", "block";
		...
	};

	pcie@290000 {
		...
		reg = <0x290000 0x1000>, <0x40000000 0x1000>;
		reg-names = "elbi", "config";
		phys = <&pcie_phy0>;
		ranges = <0x81000000 0 0	  0x60001000 0 0x00010000
			  0x82000000 0 0x60011000 0x60011000 0 0x1ffef000>;
		...
	};

Board specific DT Entry:

	pcie@290000 {
		reset-gpio = <&pin_ctrl 5 0>;
	};

	pcie@2a0000 {
		reset-gpio = <&pin_ctrl 22 0>;
	};