[PATCH] dt-bindings: PCI: dwc: rockchip: document optional pcie reference clock input

[Krzysztof Wilczyński]

Hello,

> 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.

Applied to dt-bindings, thank you!

[1/1] dt-bindings: PCI: dwc: rockchip: Document optional PCIe reference clock input
      https://git.kernel.org/pci/pci/c/639f666cf84e

	Krzysztof