On Fri, Feb 15, 2019 at 04:24:23PM +0000, Daire McNamara wrote:
> This patch adds documentation for the DT bindings for Microsemi/Microchip
> PolarFire PCIe controller when configured in host (Root Complex) mode.
>
> Signed-off-by: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx>
> ---
> .../bindings/pci/microsemi-pcie.txt | 65 +++++++++++++++++++
> 1 file changed, 65 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pci/microsemi-pcie.txt
>
> diff --git a/Documentation/devicetree/bindings/pci/microsemi-pcie.txt b/Documentation/devicetree/bindings/pci/microsemi-pcie.txt
> new file mode 100644
> index 000000000000..a16e48806edc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/microsemi-pcie.txt
> @@ -0,0 +1,65 @@
> +* Microsemi AXI PCIe Root Port Bridge DT description
> +
> +Required properties:
> +- #address-cells: Address representation for root ports, set to <3>
> +- #size-cells: Size representation for root ports, set to <2>
> +- #interrupt-cells: specifies the number of cells needed to encode an
> + interrupt source. The value must be 1.
> +- compatible: Should contain "microsemi,ms-pf-axi-pcie-host"
> +- reg: Should contain AXI PCIe registers location and length
> +- device_type: must be "pci"
> +- interrupts: Should contain AXI PCIe interrupt
> +- interrupt-map-mask,
> + interrupt-map: standard PCI properties to define the mapping of the
> + PCI interface to interrupt numbers.
> +- ranges: ranges for the PCI memory regions (I/O space region is not
> + supported by hardware)
> + Please refer to the standard PCI bus binding document for a more
> + detailed explanation
> +
> +Optional properties for PolarFire:
> +- bus-range: PCI bus numbers covered
> +
> +Interrupt controller child node
> ++++++++++++++++++++++++++++++++
> +Required properties:
> +- interrupt-controller: identifies the node as an interrupt controller
> +- #address-cells: specifies the number of cells needed to encode an
> + address. The value must be 0.
> +- #interrupt-cells: specifies the number of cells needed to encode an
> + interrupt source. The value must be 1.
> +
> +NOTE:
> +The core provides a single interrupt for both INTx/MSI messages. So,
> +create an interrupt controller node to support 'interrupt-map' DT
> +functionality. The driver will create an IRQ domain for this map, decode
> +the four INTx interrupts in ISR and route them to this domain.
> +
> +
> +Example:
> +++++++++
> +AloeVera:
> +
> + pcie: pcie@2030000000 {
> + #address-cells = <3>;
> + #size-cells = <2>;
> + #interrupt-cells = <1>;
> + compatible = "microsemi,ms-pf-axi-pcie-host";
> + device_type = "pci";
> + bus-range = <0x01 0x7f>;
> + interrupt-map = <0 0 0 1 &pcie_intc 1>,
> + <0 0 0 2 &pcie_intc 2>,
> + <0 0 0 3 &pcie_intc 3>,
> + <0 0 0 4 &pcie_intc 4>;
This is wrong. It should be:
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>;
We are mapping INT{A#,B#,C#,D#} to input [0,1,2,3] of the
interrupt controller.
Lorenzo
> + interrupt-map-mask = <0 0 0 7>;
> + interrupt-parent = <&L4>;
> + interrupts = <32>;
> + ranges = <0x3000000 0 0x40000000 0x0 0x40000000 0x0 0x20000000>;
> + reg = <0x20 0x30000000 0x0 0x4000000 0x20 0x0 0x0 0x100000>;
> + reg-names = "control", "apb";
> + pcie_intc: interrupt-controller {
> + #address-cells = <0>;
> + #interrupt-cells = <1>;
> + interrupt-controller;
> + };
> + };
> --
> 2.17.0
>
