dt-bindings: add DT binding for the Aardvark PCIe controller

Add the documentation for the Device Tree binding for the Aardvark PCIe
controller, found on Marvell Armada 3700 ARM64 SoCs.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/Documentation/devicetree/bindings/pci/aardvark-pci.txt b/Documentation/devicetree/bindings/pci/aardvark-pci.txt
new file mode 100644 (file)
index 0000000..bbcd9f4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/aardvark-pci.txt
@@ -0,0 +1,56 @@
+Aardvark PCIe controller
+
+This PCIe controller is used on the Marvell Armada 3700 ARM64 SoC.
+
+The Device Tree node describing an Aardvark PCIe controller must
+contain the following properties:
+
+ - compatible: Should be "marvell,armada-3700-pcie"
+ - reg: range of registers for the PCIe controller
+ - interrupts: the interrupt line of the PCIe controller
+ - #address-cells: set to <3>
+ - #size-cells: set to <2>
+ - device_type: set to "pci"
+ - ranges: ranges for the PCI memory and I/O regions
+ - #interrupt-cells: set to <1>
+ - msi-controller: indicates that the PCIe controller can itself
+   handle MSI interrupts
+ - msi-parent: pointer to the MSI controller to be used
+ - interrupt-map-mask and interrupt-map: standard PCI properties to
+   define the mapping of the PCIe interface to interrupt numbers.
+ - bus-range: PCI bus numbers covered
+
+In addition, the Device Tree describing an Aardvark PCIe controller
+must include a sub-node that describes the legacy interrupt controller
+built into the PCIe controller. This sub-node must have the following
+properties:
+
+ - interrupt-controller
+ - #interrupt-cells: set to <1>
+
+Example:
+
+       pcie0: pcie@d0070000 {
+               compatible = "marvell,armada-3700-pcie";
+               device_type = "pci";
+               status = "disabled";
+               reg = <0 0xd0070000 0 0x20000>;
+               #address-cells = <3>;
+               #size-cells = <2>;
+               bus-range = <0x00 0xff>;
+               interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
+               #interrupt-cells = <1>;
+               msi-controller;
+               msi-parent = <&pcie0>;
+               ranges = <0x82000000 0 0xe8000000   0 0xe8000000 0 0x1000000 /* Port 0 MEM */
+                         0x81000000 0 0xe9000000   0 0xe9000000 0 0x10000>; /* Port 0 IO*/
+               interrupt-map-mask = <0 0 0 7>;
+               interrupt-map = <0 0 0 1 &pcie_intc 0>,
+                               <0 0 0 2 &pcie_intc 1>,
+                               <0 0 0 3 &pcie_intc 2>,
+                               <0 0 0 4 &pcie_intc 3>;
+               pcie_intc: interrupt-controller {
+                       interrupt-controller;
+                       #interrupt-cells = <1>;
+               };
+       };