dt-bindings: PCI: eswin: Add ESWIN PCIe Root Complex

Add Device Tree binding documentation for the ESWIN PCIe Root Complex. The
Root Complex is based on Synopsys Designware PCIe IP.

Signed-off-by: Yu Ning <ningyu@eswincomputing.com>
Signed-off-by: Yanghui Ou <ouyanghui@eswincomputing.com>
Signed-off-by: Senchuan Zhang <zhangsenchuan@eswincomputing.com>
[mani: Renamed 'EIC7700' to 'ESWIN']
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: add driver tag in subject]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260227111732.1979-1-zhangsenchuan@eswincomputing.com

Author: zhangsenchuaneswincomputing

Documentation/devicetree/bindings/pci/eswin,pcie.yaml

@@ -0,0 +1,166 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pci/eswin,pcie.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ESWIN PCIe Root Complex
+
+maintainers:
+  - Yu Ning <ningyu@eswincomputing.com>
+  - Senchuan Zhang <zhangsenchuan@eswincomputing.com>
+  - Yanghui Ou <ouyanghui@eswincomputing.com>
+
+description:
+  ESWIN SoCs PCIe Root Complex is based on the Synopsys DesignWare PCIe IP.
+
+properties:
+  compatible:
+    const: eswin,eic7700-pcie
+
+  reg:
+    maxItems: 3
+
+  reg-names:
+    items:
+      - const: dbi
+      - const: config
+      - const: elbi
+
+  ranges:
+    maxItems: 3
+
+  '#interrupt-cells':
+    const: 1
+
+  interrupt-names:
+    items:
+      - const: msi
+      - const: inta
+      - const: intb
+      - const: intc
+      - const: intd
+
+  interrupt-map:
+    maxItems: 4
+
+  interrupt-map-mask:
+    items:
+      - const: 0
+      - const: 0
+      - const: 0
+      - const: 7
+
+  clocks:
+    maxItems: 4
+
+  clock-names:
+    items:
+      - const: mstr
+      - const: dbi
+      - const: phy_reg
+      - const: aux
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: dbi
+      - const: pwr
+
+patternProperties:
+  "^pcie@":
+    type: object
+    $ref: /schemas/pci/pci-pci-bridge.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+      num-lanes:
+        maximum: 4
+
+      resets:
+        maxItems: 1
+
+      reset-names:
+        items:
+          - const: perst
+
+    required:
+      - reg
+      - ranges
+      - num-lanes
+      - resets
+      - reset-names
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - ranges
+  - interrupts
+  - interrupt-names
+  - interrupt-map-mask
+  - interrupt-map
+  - '#interrupt-cells'
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+
+allOf:
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pcie@54000000 {
+            compatible = "eswin,eic7700-pcie";
+            reg = <0x0 0x54000000 0x0 0x4000000>,
+                  <0x0 0x40000000 0x0 0x800000>,
+                  <0x0 0x50000000 0x0 0x100000>;
+            reg-names = "dbi", "config", "elbi";
+            #address-cells = <3>;
+            #size-cells = <2>;
+            #interrupt-cells = <1>;
+            ranges = <0x01000000 0x0 0x40800000 0x0 0x40800000 0x0 0x800000>,
+                     <0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0xf000000>,
+                     <0x43000000 0x80 0x00000000 0x80 0x00000000 0x2 0x00000000>;
+            bus-range = <0x00 0xff>;
+            clocks = <&clock 144>,
+                     <&clock 145>,
+                     <&clock 146>,
+                     <&clock 147>;
+            clock-names = "mstr", "dbi", "phy_reg", "aux";
+            resets = <&reset 97>,
+                     <&reset 98>;
+            reset-names = "dbi", "pwr";
+            interrupts = <220>, <179>, <180>, <181>, <182>, <183>, <184>, <185>, <186>;
+            interrupt-names = "msi", "inta", "intb", "intc", "intd";
+            interrupt-parent = <&plic>;
+            interrupt-map-mask = <0x0 0x0 0x0 0x7>;
+            interrupt-map = <0x0 0x0 0x0 0x1 &plic 179>,
+                            <0x0 0x0 0x0 0x2 &plic 180>,
+                            <0x0 0x0 0x0 0x3 &plic 181>,
+                            <0x0 0x0 0x0 0x4 &plic 182>;
+            device_type = "pci";
+            pcie@0 {
+                reg = <0x0 0x0 0x0 0x0 0x0>;
+                #address-cells = <3>;
+                #size-cells = <2>;
+                ranges;
+                device_type = "pci";
+                num-lanes = <4>;
+                resets = <&reset 99>;
+                reset-names = "perst";
+            };
+        };
+    };