dt-bindings: PCI: qcom: Add MHI registers for IPQ9574

JIRA: https://issues.redhat.com/browse/RHEL-107597
Upstream Status: a733e71

commit a733e71
Author: Varadarajan Narayanan <quic_varada@quicinc.com>
Date:   Mon Mar 17 15:30:26 2025 +0530

    dt-bindings: PCI: qcom: Add MHI registers for IPQ9574

    The MHI registers are present in IPQ5332, IPQ6018, IPQ8074 and IPQ9574
    SoCs. Hence, add the MHI registers to the binding to allow these registers
    to be defined in devicetree.

    Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
    [mani: commit message rewording]
    Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
    Link: https://patch.msgid.link/20250317100029.881286-2-quic_varada@quicinc.com

Signed-off-by: Myron Stowe <mstowe@redhat.com>

Author: Myron Stowe

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

@@ -177,14 +177,16 @@ allOf:
       properties:
         reg:
           minItems: 5
-          maxItems: 5
+          maxItems: 6
         reg-names:
+          minItems: 5
           items:
             - const: dbi # DesignWare PCIe registers
             - const: elbi # External local bus interface registers
             - const: atu # ATU address space
             - const: parf # Qualcomm specific registers
             - const: config # PCIe configuration space
+            - const: mhi # MHI registers
 
   - if:
       properties: