PCI: hisi: Add HiSilicon STB SoC PCIe controller driver

Add a HiSilicon STB SoC PCIe controller driver.  This controller is based
on the DesignWare PCIe core.

Signed-off-by: Jianguo Sun <sunjianguo1@huawei.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt

@@ -0,0 +1,68 @@
+HiSilicon STB PCIe host bridge DT description
+
+The HiSilicon STB PCIe host controller is based on the DesignWare PCIe core.
+It shares common functions with the DesignWare PCIe core driver and inherits
+common properties defined in
+Documentation/devicetree/bindings/pci/designware-pcie.txt.
+
+Additional properties are described here:
+
+Required properties
+- compatible: Should be one of the following strings:
+		"hisilicon,hi3798cv200-pcie"
+- reg: Should contain sysctl, rc_dbi, config registers location and length.
+- reg-names: Must include the following entries:
+  "control": control registers of PCIe controller;
+  "rc-dbi": configuration space of PCIe controller;
+  "config": configuration transaction space of PCIe controller.
+- bus-range: PCI bus numbers covered.
+- interrupts: MSI interrupt.
+- interrupt-names: Must include "msi" entries.
+- clocks: List of phandle and clock specifier pairs as listed in clock-names
+  property.
+- clock-name: Must include the following entries:
+  "aux": auxiliary gate clock;
+  "pipe": pipe gate clock;
+  "sys": sys gate clock;
+  "bus": bus gate clock.
+- resets: List of phandle and reset specifier pairs as listed in reset-names
+  property.
+- reset-names: Must include the following entries:
+  "soft": soft reset;
+  "sys": sys reset;
+  "bus": bus reset.
+
+Optional properties:
+- reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal.
+- phys: List of phandle and phy mode specifier, should be 0.
+- phy-names: Must be "phy".
+
+Example:
+	pcie@f9860000 {
+		compatible = "hisilicon,hi3798cv200-pcie";
+		reg = <0xf9860000 0x1000>,
+		      <0xf0000000 0x2000>,
+		      <0xf2000000 0x01000000>;
+		reg-names = "control", "rc-dbi", "config";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		device_type = "pci";
+		bus-range = <0 15>;
+		num-lanes = <1>;
+		ranges=<0x81000000 0 0 0xf4000000 0 0x00010000
+			0x82000000 0 0xf3000000 0xf3000000 0 0x01000000>;
+		interrupts = <GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "msi";
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&crg PCIE_AUX_CLK>,
+			 <&crg PCIE_PIPE_CLK>,
+			 <&crg PCIE_SYS_CLK>,
+			 <&crg PCIE_BUS_CLK>;
+		clock-names = "aux", "pipe", "sys", "bus";
+		resets = <&crg 0x18c 6>, <&crg 0x18c 5>, <&crg 0x18c 4>;
+		reset-names = "soft", "sys", "bus";
+		phys = <&combphy1 PHY_TYPE_PCIE>;
+		phy-names = "phy";
+	};