dt-bindings: PCI: ultrarisc: Add required DP1000 PCIe clocks

Require DP1000 PCIe controller nodes to provide clocks and clock-names,
using the standard DesignWare clock names "core", "dbi", and "aux".

Fixes: d9ff07f459 ("dt-bindings: PCI: Add UltraRISC DP1000 PCIe controller")
Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260731-ultrarisc-pci-clk-v4-1-d738b491e49a@ultrarisc.com

Documentation/devicetree/bindings/pci/ultrarisc,dp1000-pcie.yaml

@@ -43,6 +43,18 @@ properties:
       - description: Legacy INTC interrupt
       - description: Legacy INTD interrupt
 
+  clocks:
+    items:
+      - description: PCIe core clock
+      - description: Data Bus Interface (DBI) clock
+      - description: Auxiliary clock
+
+  clock-names:
+    items:
+      - const: core
+      - const: dbi
+      - const: aux
+
   interrupt-names:
     items:
       - const: msi
@@ -55,6 +67,8 @@ required:
   - compatible
   - reg
   - reg-names
+  - clocks
+  - clock-names
   - interrupts
   - interrupt-names
 
@@ -71,6 +85,8 @@ examples:
         reg = <0x0 0x21000000 0x0 0x01000000>,
               <0x0 0x4fff0000 0x0 0x00010000>;
         reg-names = "dbi", "config";
+        clocks = <&clkc 9>, <&clkc 7>, <&clkc 10>;
+        clock-names = "core", "dbi", "aux";
         ranges = <0x81000000 0x0 0x4fbf0000 0x0 0x4fbf0000 0x0 0x00400000>,
                  <0x82000000 0x0 0x40000000 0x0 0x40000000 0x0 0x0fbf0000>,
                  <0xc3000000 0x40 0x00000000 0x40 0x00000000 0xd 0x00000000>;