[PATCH v6 1/3] dt-bindings: PCI: dwc: Add one more reference clock

[Rob Herring]

On Wed, Sep 17, 2025 at 12:52:36PM +0800, Richard Zhu wrote:
> Add one more reference clock "extref" for a reference clock that comes
> from external crystal oscillator.

See what I just commented on v5.

> 
> Signed-off-by: Richard Zhu <hongxing.zhu at nxp.com>
> Reviewed-by: Frank Li <Frank.Li at nxp.com>
> ---
>  .../devicetree/bindings/pci/snps,dw-pcie-common.yaml        | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> index 34594972d8db..0134a759185e 100644
> --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
> @@ -105,6 +105,12 @@ properties:
>              define it with this name (for instance pipe, core and aux can
>              be connected to a single source of the periodic signal).
>            const: ref
> +        - description:
> +            Some dwc wrappers (like i.MX95 PCIes) have two reference clock
> +            inputs, one from an internal PLL, the other from an off-chip crystal
> +            oscillator. If present, 'extref' refers to a reference clock from
> +            an external oscillator.
> +          const: extref
>          - description:
>              Clock for the PHY registers interface. Originally this is
>              a PHY-viewport-based interface, but some platform may have
> -- 
> 2.37.1
>