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* Re: [PATCH v2 1/5] dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: Add support for glymur Gen5 x8 bifurcation mode
From: Qiang Yu @ 2026-04-09  2:19 UTC (permalink / raw)
  To: Rob Herring
  Cc: Vinod Koul, Neil Armstrong, Krzysztof Kozlowski, Conor Dooley,
	Philipp Zabel, Bjorn Andersson, Konrad Dybcio, linux-arm-msm,
	linux-phy, devicetree, linux-kernel
In-Reply-To: <20260407161311.GA2666255-robh@kernel.org>

On Tue, Apr 07, 2026 at 11:13:11AM -0500, Rob Herring wrote:
> On Mon, Mar 23, 2026 at 12:15:28AM -0700, Qiang Yu wrote:
> > The Glymur SoC has pcie3a and pcie3b PHYs that can operate in two modes:
> > 
> > 1. Independent 4-lane mode: Each PHY operates as a separate PCIe Gen5
> >    4-lane interface, compatible with qcom,glymur-qmp-gen5x4-pcie-phy
> > 2. Bifurcation mode (8-lane): pcie3a phy acts as leader and pcie3b phy as
> >    follower to form a single 8-lane PCIe Gen5 interface
> > 
> > In bifurcation mode, the hardware design requires controlling additional
> > resources beyond the standard pcie3a PHY configuration:
> > 
> > - pcie3b's aux_clk (phy_b_aux)
> > - pcie3b's phy_gdsc power domain
> > - pcie3b's bcr/nocsr reset
> > 
> > Add qcom,glymur-qmp-gen5x8-pcie-phy compatible string to document this
> > 8-lane bifurcation configuration.
> > 
> > The phy_b_aux clock is used as the 6th clock instead of pipediv2,
> > requiring the clock-names enum to be extended to support both
> > [phy_b_aux, pipediv2] options at index 5. This follows the existing
> > pattern used for [rchng, refgen] clocks at index 3.
> > 
> > Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
> > ---
> >  .../bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml   | 45 ++++++++++++++++++----
> >  1 file changed, 37 insertions(+), 8 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 3a35120a77ec0ceb814a1cdcacff32fef32b4f7b..25717bc9be98824e38f3c27c3299fbd1f2e7e299 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
> > @@ -18,6 +18,7 @@ properties:
> >      enum:
> >        - qcom,glymur-qmp-gen4x2-pcie-phy
> >        - qcom,glymur-qmp-gen5x4-pcie-phy
> > +      - qcom,glymur-qmp-gen5x8-pcie-phy
> >        - qcom,kaanapali-qmp-gen3x2-pcie-phy
> >        - qcom,qcs615-qmp-gen3x1-pcie-phy
> >        - qcom,qcs8300-qmp-gen4x2-pcie-phy
> > @@ -68,20 +69,23 @@ properties:
> >        - const: ref
> >        - enum: [rchng, refgen]
> >        - const: pipe
> > -      - const: pipediv2
> > +      - enum: [phy_b_aux, pipediv2]
> >  
> >    power-domains:
> > -    maxItems: 1
> > +    minItems: 1
> > +    maxItems: 2
> 
> Once there is more than 1, you have to define the order and what each 
> one is for.
>

Okay, will add - description for each power-domains.

> >  
> >    resets:
> >      minItems: 1
> > -    maxItems: 2
> > +    maxItems: 4
> >  
> >    reset-names:
> >      minItems: 1
> >      items:
> >        - const: phy
> >        - const: phy_nocsr
> > +      - const: phy_b
> > +      - const: phy_b_nocsr
> >  
> >    vdda-phy-supply: true
> >  
> > @@ -183,6 +187,7 @@ allOf:
> >              enum:
> >                - qcom,glymur-qmp-gen4x2-pcie-phy
> >                - qcom,glymur-qmp-gen5x4-pcie-phy
> > +              - qcom,glymur-qmp-gen5x8-pcie-phy
> >                - qcom,qcs8300-qmp-gen4x2-pcie-phy
> >                - qcom,sa8775p-qmp-gen4x2-pcie-phy
> >                - qcom,sa8775p-qmp-gen4x4-pcie-phy
> > @@ -201,6 +206,17 @@ allOf:
> >          clock-names:
> >            minItems: 6
> >  
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - qcom,glymur-qmp-gen5x8-pcie-phy
> > +    then:
> > +      properties:
> > +        power-domains:
> > +          minItems: 2
> 
> else:
>   maxItems: 1
>

Will add this.

- Qiang Yu
> > +
> >    - if:
> >        properties:
> >          compatible:
> > @@ -223,11 +239,24 @@ allOf:
> >          reset-names:
> >            minItems: 2
> >      else:
> > -      properties:
> > -        resets:
> > -          maxItems: 1
> > -        reset-names:
> > -          maxItems: 1
> > +      if:
> > +        properties:
> > +          compatible:
> > +            contains:
> > +              enum:
> > +                - qcom,glymur-qmp-gen5x8-pcie-phy
> > +      then:
> > +        properties:
> > +          resets:
> > +            minItems: 4
> > +          reset-names:
> > +            minItems: 4
> > +      else:
> > +        properties:
> > +          resets:
> > +            maxItems: 1
> > +          reset-names:
> > +            maxItems: 1
> >  
> >    - if:
> >        properties:
> > 
> > -- 
> > 2.34.1
> > 

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