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Message-ID: <20250628-petite-fabulous-firefly-80a6f4@krzk-bin>
Date: Sat, 28 Jun 2025 14:35:10 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Richard Zhu <hongxing.zhu@....com>
Cc: frank.li@....com, l.stach@...gutronix.de, lpieralisi@...nel.org, 
	kwilczynski@...nel.org, mani@...nel.org, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, bhelgaas@...gle.com, 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 v4 2/3] dt-binding: pci-imx6: Add external reference
 clock mode support

On Thu, Jun 26, 2025 at 03:38:03PM +0800, Richard Zhu wrote:
> On i.MX, the PCIe reference clock might come from either internal
> system PLL or external clock source.
> Add the external reference clock source for reference clock.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---
>  Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> index ca5f2970f217..a45876aba4da 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml
> @@ -219,7 +219,12 @@ allOf:
>              - const: pcie_bus
>              - const: pcie_phy
>              - const: pcie_aux
> -            - const: ref
> +            - description: PCIe reference clock.
> +              oneOf:
> +                - description: The controller might be configured clocking
> +                    coming in from either an internal system PLL or an
> +                    external clock source.
> +                  enum: [ref, extref]

NAK

As explained in other thread this is the same input and you just
call it differently.

Best regards,
Krzysztof


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