dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/pci/cdns,cdns-pcie-ep.yaml

@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/cdns,cdns-pcie-ep.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence PCIe EP Controller
+
+maintainers:
+  - Tom Joseph <tjoseph@cadence.com>
+
+allOf:
+  - $ref: "cdns-pcie-ep.yaml#"
+
+properties:
+  compatible:
+    const: cdns,cdns-pcie-ep
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+    items:
+      - const: reg
+      - const: mem
+
+required:
+  - reg
+  - reg-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    bus {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie-ep@fc000000 {
+                compatible = "cdns,cdns-pcie-ep";
+                reg = <0x0 0xfc000000 0x0 0x01000000>,
+                      <0x0 0x80000000 0x0 0x40000000>;
+                reg-names = "reg", "mem";
+                cdns,max-outbound-regions = <16>;
+                max-functions = /bits/ 8 <8>;
+                phys = <&pcie_phy0>;
+                phy-names = "pcie-phy";
+        };
+    };
+...