dt-bindings: PCI: microchip: Add Microchip PolarFire host binding

Add device tree bindings for the Microchip PolarFire PCIe controller
when configured in host (Root Complex) mode.

Link: https://lore.kernel.org/r/20210125162934.5335-3-daire.mcnamara@microchip.comSigned-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/microchip,pcie-host.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PCIe Root Port Bridge Controller Device Tree Bindings
+
+maintainers:
+  - Daire McNamara <daire.mcnamara@microchip.com>
+
+allOf:
+  - $ref: /schemas/pci/pci-bus.yaml#
+
+properties:
+  compatible:
+    const: microchip,pcie-host-1.0 # PolarFire
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: cfg
+      - const: apb
+
+  interrupts:
+    minItems: 1
+    maxItems: 2
+    items:
+      - description: PCIe host controller
+      - description: builtin MSI controller
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      - const: pcie
+      - const: msi
+
+  ranges:
+    maxItems: 1
+
+  msi-controller:
+    description: Identifies the node as an MSI controller.
+
+  msi-parent:
+    description: MSI controller the device is capable of using.
+
+required:
+  - reg
+  - reg-names
+  - "#interrupt-cells"
+  - interrupts
+  - interrupt-map-mask
+  - interrupt-map
+  - msi-controller
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+            #address-cells = <2>;
+            #size-cells = <2>;
+            pcie0: pcie@2030000000 {
+                    compatible = "microchip,pcie-host-1.0";
+                    reg = <0x0 0x70000000 0x0 0x08000000>,
+                          <0x0 0x43000000 0x0 0x00010000>;
+                    reg-names = "cfg", "apb";
+                    device_type = "pci";
+                    #address-cells = <3>;
+                    #size-cells = <2>;
+                    #interrupt-cells = <1>;
+                    interrupts = <119>;
+                    interrupt-map-mask = <0x0 0x0 0x0 0x7>;
+                    interrupt-map = <0 0 0 1 &pcie_intc0 0>,
+                                    <0 0 0 2 &pcie_intc0 1>,
+                                    <0 0 0 3 &pcie_intc0 2>,
+                                    <0 0 0 4 &pcie_intc0 3>;
+                    interrupt-parent = <&plic0>;
+                    msi-parent = <&pcie0>;
+                    msi-controller;
+                    bus-range = <0x00 0x7f>;
+                    ranges = <0x03000000 0x0 0x78000000 0x0 0x78000000 0x0 0x04000000>;
+                    pcie_intc0: interrupt-controller {
+                        #address-cells = <0>;
+                        #interrupt-cells = <1>;
+                        interrupt-controller;
+                    };
+            };
+    };