dt-bindings: PCI: imx6q-pcie: Add i.MX95 optional intr/aer/pme interrupts

The i.MX95 PCIe controller introduces three additional dedicated hardware
interrupt lines for specific events:

  - intr: general controller events
  - aer: Advanced Error Reporting events
  - pme: Power Management Events

These interrupts are optional on i.MX95. PCIe basic functionality
(enumeration, configuration, and data transfer) works correctly without
them, as the controller can operate using only the existing MSI interrupt.

Earlier i.MX PCIe variants (imx6q, imx6sx, imx6qp, imx7d, imx8mm, imx8mp,
imx8mq, imx8q) do not have these three dedicated interrupt lines.

Update the binding to allow up to 5 interrupts for i.MX95, while
restricting earlier variants to a maximum of 2 interrupts using
conditional constraints (if/then schema). This ensures the schema
accurately reflects the hardware capabilities of each SoC variant.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260618092100.3669556-2-hongxing.zhu@oss.nxp.com

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml

@@ -58,12 +58,18 @@ properties:
     items:
       - description: builtin MSI controller.
       - description: builtin DMA controller.
+      - description: PCIe event interrupt.
+      - description: builtin AER SPI standalone interrupt line.
+      - description: builtin PME SPI standalone interrupt line.
 
   interrupt-names:
     minItems: 1
     items:
       - const: msi
       - const: dma
+      - const: intr
+      - const: aer
+      - const: pme
 
   reset-gpio:
     deprecated: true
@@ -249,6 +255,25 @@ allOf:
             - const: ref
             - const: extref  # Optional
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - fsl,imx6q-pcie
+            - fsl,imx6sx-pcie
+            - fsl,imx6qp-pcie
+            - fsl,imx7d-pcie
+            - fsl,imx8mm-pcie
+            - fsl,imx8mp-pcie
+            - fsl,imx8mq-pcie
+            - fsl,imx8q-pcie
+    then:
+      properties:
+        interrupts:
+          maxItems: 2
+        interrupt-names:
+          maxItems: 2
+
 unevaluatedProperties: false
 
 examples: