linux-kernel - Re: [PATCH v8 1/3] dt-bindings: PCI: dwc: Add external reference clock input

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Message-ID: <20251024-mandolin-starlet-f7cfd8ba4210@spud>
Date: Fri, 24 Oct 2025 17:51:58 +0100
From: Conor Dooley <conor@...nel.org>
To: Richard Zhu <hongxing.zhu@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	bhelgaas@...gle.com, frank.li@....com, l.stach@...gutronix.de,
	lpieralisi@...nel.org, kwilczynski@...nel.org, mani@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/3] dt-bindings: PCI: dwc: Add external reference
 clock input

On Fri, Oct 24, 2025 at 10:40:11AM +0800, Richard Zhu wrote:
> Add external reference clock input "extref" for a reference clock that
> comes from external crystal oscillator.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>
pw-bot: not-applicable

> ---
>  .../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 34594972d8dbe..0134a759185ec 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
> 

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