linux-kernel - Re: [PATCH v2 01/13] dt-bindings: pci: apple,pcie: Add t6020 compatible string

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Message-Id: <87iknx75at.fsf@bloch.sibelius.xs4all.nl>
Date: Tue, 25 Mar 2025 11:50:18 +0100
From: Mark Kettenis <mark.kettenis@...all.nl>
To: Marc Zyngier <maz@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	asahi@...ts.linux.dev, alyssa@...enzweig.io, j@...nau.net,
	marcan@...can.st, sven@...npeter.dev, bhelgaas@...gle.com,
	lpieralisi@...nel.org, kw@...ux.com,
	manivannan.sadhasivam@...aro.org, robh@...nel.org,
	krzk+dt@...nel.org
Subject: Re: [PATCH v2 01/13] dt-bindings: pci: apple,pcie: Add t6020 compatible string

> From: Marc Zyngier <maz@...nel.org>
> Date: Tue, 25 Mar 2025 10:25:58 +0000

Hi Marc,

Sorry for not spotting this in the earlier versions, but:

> From: Alyssa Rosenzweig <alyssa@...enzweig.io>
> 
> t6020 adds some register ranges compared to t8103, so requires
> a new compatible as well as the new PHY registers themselves.
> 
> Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
> [maz: added PHY registers]
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  Documentation/devicetree/bindings/pci/apple,pcie.yaml | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/apple,pcie.yaml b/Documentation/devicetree/bindings/pci/apple,pcie.yaml
> index c8775f9cb0713..77554899b9420 100644
> --- a/Documentation/devicetree/bindings/pci/apple,pcie.yaml
> +++ b/Documentation/devicetree/bindings/pci/apple,pcie.yaml
> @@ -17,6 +17,10 @@ description: |
>    implements its root ports.  But the ATU found on most DesignWare
>    PCIe host bridges is absent.
>  
> +  On systems derived from T602x, the PHY registers are in a region
> +  separate from the port registers. In that case, there is one PHY
> +  register range per port register range.
> +
>    All root ports share a single ECAM space, but separate GPIOs are
>    used to take the PCI devices on those ports out of reset.  Therefore
>    the standard "reset-gpios" and "max-link-speed" properties appear on
> @@ -35,11 +39,12 @@ properties:
>            - apple,t8103-pcie
>            - apple,t8112-pcie
>            - apple,t6000-pcie
> +          - apple,t6020-pcie
>        - const: apple,pcie

Since the T602x PCIe controller has a different register layout, it
isn't compatible with the others, so it should not include the
"apple,pcie" compatible.  The "downstream" device trees for
T602x-based devices do indeed not list "apple,pcie" as a compatible.
So I think this needs to be written as:

  compatible:
    oneOf:
      - items:
          - enum:
              - apple,t8103-pcie
              - apple,t8112-pcie
              - apple,t6000-pcie
          - const: apple,pcie
      - const: apple,t6020-pcie

>  
>    reg:
>      minItems: 3
> -    maxItems: 6
> +    maxItems: 10
>  
>    reg-names:
>      minItems: 3
> @@ -50,6 +55,10 @@ properties:
>        - const: port1
>        - const: port2
>        - const: port3
> +      - const: phy0
> +      - const: phy1
> +      - const: phy2
> +      - const: phy3
>  
>    ranges:
>      minItems: 2
> -- 
> 2.39.2
> 
> 
>