tegrakernel/kernel/kernel-4.9/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt

* Broadcom iProc PCIe controller with the platform bus interface

Required properties:
- compatible: Must be "brcm,iproc-pcie" for PAXB, or "brcm,iproc-pcie-paxc"
  for PAXC.  PAXB-based root complex is used for external endpoint devices.
  PAXC-based root complex is connected to emulated endpoint devices
  internal to the ASIC
- reg: base address and length of the PCIe controller I/O register space
- #interrupt-cells: set to <1>
- interrupt-map-mask and interrupt-map, standard PCI properties to define the
  mapping of the PCIe interface to interrupt numbers
- linux,pci-domain: PCI domain ID. Should be unique for each host controller
- bus-range: PCI bus numbers covered
- #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

Optional properties:
- phys: phandle of the PCIe PHY device
- phy-names: must be "pcie-phy"

- brcm,pcie-ob: Some iProc SoCs do not have the outbound address mapping done
by the ASIC after power on reset. In this case, SW needs to configure it

If the brcm,pcie-ob property is present, the following properties become
effective:

Required:
- brcm,pcie-ob-axi-offset: The offset from the AXI address to the internal
address used by the iProc PCIe core (not the PCIe address)
- brcm,pcie-ob-window-size: The outbound address mapping window size (in MB)

Optional:
- brcm,pcie-ob-oarr-size: Some iProc SoCs need the OARR size bit to be set to
increase the outbound window size

MSI support (optional):

For older platforms without MSI integrated in the GIC, iProc PCIe core provides
an event queue based MSI support.  The iProc MSI uses host memories to store
MSI posted writes in the event queues

- msi-parent: Link to the device node of the MSI controller.  On newer iProc
platforms, the MSI controller may be gicv2m or gicv3-its.  On older iProc
platforms without MSI support in its interrupt controller, one may use the
event queue based MSI support integrated within the iProc PCIe core.

When the iProc event queue based MSI is used, one needs to define the
following properties in the MSI device node:
- compatible: Must be "brcm,iproc-msi"
- msi-controller: claims itself as an MSI controller
- interrupt-parent: Link to its parent interrupt device
- interrupts: List of interrupt IDs from its parent interrupt device

Optional properties:
- brcm,pcie-msi-inten: Needs to be present for some older iProc platforms that
require the interrupt enable registers to be set explicitly to enable MSI

Example:
	pcie0: pcie@18012000 {
		compatible = "brcm,iproc-pcie";
		reg = <0x18012000 0x1000>;

		#interrupt-cells = <1>;
		interrupt-map-mask = <0 0 0 0>;
		interrupt-map = <0 0 0 0 &gic GIC_SPI 100 IRQ_TYPE_NONE>;

		linux,pci-domain = <0>;

		bus-range = <0x00 0xff>;

		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		ranges = <0x81000000 0 0	  0x28000000 0 0x00010000
			  0x82000000 0 0x20000000 0x20000000 0 0x04000000>;

		phys = <&phy 0 5>;
		phy-names = "pcie-phy";

		brcm,pcie-ob;
		brcm,pcie-ob-oarr-size;
		brcm,pcie-ob-axi-offset = <0x00000000>;
		brcm,pcie-ob-window-size = <256>;

		msi-parent = <&msi0>;

		/* iProc event queue based MSI */
		msi0: msi@18012000 {
			compatible = "brcm,iproc-msi";
			msi-controller;
			interrupt-parent = <&gic>;
			interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
				     <GIC_SPI 97 IRQ_TYPE_NONE>,
				     <GIC_SPI 98 IRQ_TYPE_NONE>,
				     <GIC_SPI 99 IRQ_TYPE_NONE>,
		};
	};

	pcie1: pcie@18013000 {
		compatible = "brcm,iproc-pcie";
		reg = <0x18013000 0x1000>;

		#interrupt-cells = <1>;
		interrupt-map-mask = <0 0 0 0>;
		interrupt-map = <0 0 0 0 &gic GIC_SPI 106 IRQ_TYPE_NONE>;

		linux,pci-domain = <1>;

		bus-range = <0x00 0xff>;

		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		ranges = <0x81000000 0 0	  0x48000000 0 0x00010000
			  0x82000000 0 0x40000000 0x40000000 0 0x04000000>;

		phys = <&phy 1 6>;
		phy-names = "pcie-phy";
	};