linux-kernel - Re: [PATCH] dt-bindings: phy: sc8280xp-qmp-pcie: Disallow bifurcation register on Purwa

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Message-ID: <8ea2358b-00e9-44b2-acce-777863e8688e@kernel.org>
Date: Mon, 19 Jan 2026 15:50:29 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konradybcio@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 YijieYang <yijie.yang@....qualcomm.com>,
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH] dt-bindings: phy: sc8280xp-qmp-pcie: Disallow bifurcation
 register on Purwa

On 19/01/2026 12:48, Konrad Dybcio wrote:
> From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> Neither of the two Gen4x4 PHYs found on Purwa supports bifurcation.
> The PHY is however physically laid out as if it were to, since there
> are two separate ports (A/B).
> 
> Split out a new if-then block to un-require the bifurcation register
> handle to squash this warning:
> 
> purwa-iot-evk.dtb: phy@...4000 (qcom,x1p42100-qmp-gen4x4-pcie-phy): 'qcom,4ln-config-sel' is a required property

Warning does not exist in the kernel, so please do not reference it.

> 
> Fixes: 2e1ffd4c1805 ("dt-bindings: phy: qcom,qmp-pcie: Add X1P42100 PCIe Gen4x4 PHY")
> Reported-by: Rob Herring <robh@...nel.org>
> Closes: https://lore.kernel.org/linux-arm-msm/176857775469.1631885.16133311938753588148.robh@kernel.org/
> Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> ---
>  .../devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> index 3a35120a77ec..431e8cb5df84 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> @@ -136,13 +136,22 @@ allOf:
>            items:
>              - description: port a
>              - description: port b
> -      required:
> -        - qcom,4ln-config-sel
>      else:
>        properties:
>          reg:
>            maxItems: 1
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,sc8280xp-qmp-gen3x4-pcie-phy
> +              - qcom,x1e80100-qmp-gen4x4-pcie-phy
Best regards,
Krzysztof