[PATCH 4/6] pci, thunder: Document PCIe host controller devicetree bindings

[Robert Richter <rric@kernel.org>]

From: Sunil Goutham <sgoutham@cavium.com>

This patch adds documentation for the devicetree bindings used by the
Thunder PCI host controller.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
---
 .../devicetree/bindings/pci/cavium,thunder-pci.txt | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/cavium,thunder-pci.txt

diff --git a/Documentation/devicetree/bindings/pci/cavium,thunder-pci.txt b/Documentation/devicetree/bindings/pci/cavium,thunder-pci.txt
new file mode 100644
index 000000000000..c8ff3d2e8630
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/cavium,thunder-pci.txt
@@ -0,0 +1,32 @@
+* Cavium Thunder PCIe interface
+
+Required properties:
+- compatible: should contain "cavium,thunder-pcie" to identify the core.
+- device_type: set to "pci"
+- #address-cells: set to <3>
+- #size-cells: set to <2>
+- #stream-id-cells: set to <1>
+- bus-range: PCI bus numbers covered
+- reg: base address and length of the pcie configuration space.
+- ranges: ranges for the PCI memory regions.
+- msi-parent: Link to the hardware entity that serves as the Message
+  Signaled Interrupt controller for this PCI controller.
+
+Example:
+
+SoC specific DT Entry:
+
+	pcie0: pcie0@0x848000000000 {
+		compatible = "cavium,thunder-pcie";
+		device_type = "pci";
+		msi-parent = <&its>;
+		bus-range = <0 255>;
+		#size-cells = <2>;
+		#address-cells = <3>;
+		#stream-id-cells = <1>;
+		reg = <0x8480 0x00000000 0 0x10000000>;  /* Configuration space */
+		ranges = <0x03000000 0x8010 0x00000000 0x8010 0x00000000 0x70 0x00000000>, /* mem */
+			<0x03000000 0x8300 0x00000000 0x8300 0x00000000 0x80 0x00000000>,
+			<0x03000000 0x87e0 0x00000000 0x87e0 0x00000000 0x01 0x00000000>;
+	};
+
-- 
2.1.0