dt-bindings: PCI: dwc: rockchip: Document optional PCIe reference clock input

On some boards the 100MHz PCIe reference clock to both controller and
devices is controllable. Add that clock to the list of clocks.

The clock is optional, so the minItems stays the same.

Link: https://lore.kernel.org/linux-pci/20231206145041.667900-1-heiko@sntech.de
Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
index 1ae8dcfa072cea19c1b897ffaa91fff9b7dcf703..5f719218c472c8476ae8fbfb6b65b898fe49ff6b 100644 (file)
--- a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml
@@ -49,6 +49,7 @@ properties:
       - description: APB clock for PCIe
       - description: Auxiliary clock for PCIe
       - description: PIPE clock
+      - description: Reference clock for PCIe
 
   clock-names:
     minItems: 5
@@ -59,6 +60,7 @@ properties:
       - const: pclk
       - const: aux
       - const: pipe
+      - const: ref
 
   interrupts:
     items: