linux-kernel - Re: [PATCH 1/3] dt-bindings: PCI: Extend max-link-speed to support PCIe Gen5/Gen6

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Message-ID: <20250527193550.GA1104855-robh@kernel.org>
Date: Tue, 27 May 2025 14:35:50 -0500
From: Rob Herring <robh@...nel.org>
To: Hans Zhang <18255117159@....com>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
	krzk+dt@...nel.org, manivannan.sadhasivam@...aro.org,
	conor+dt@...nel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: PCI: Extend max-link-speed to support
 PCIe Gen5/Gen6

On Tue, May 20, 2025 at 12:04:46AM +0800, Hans Zhang wrote:
> Update the device tree binding documentation for PCI to include
> PCIe Gen5 and Gen6 support in the `max-link-speed` property.
> The original documentation limited the value to 1~4 (Gen1~Gen4),
> but the kernel now supports up to Gen6. This change ensures the
> documentation aligns with the actual code implementation.
> 
> Signed-off-by: Hans Zhang <18255117159@....com>
> ---
>  Documentation/devicetree/bindings/pci/pci.txt | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

This file is now removed. Update the schema if you need to. It lives in 
dtschema project.

> 
> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
> index 6a8f2874a24d..5ffd690e3fc7 100644
> --- a/Documentation/devicetree/bindings/pci/pci.txt
> +++ b/Documentation/devicetree/bindings/pci/pci.txt
> @@ -22,8 +22,9 @@ driver implementation may support the following properties:
>     If present this property specifies PCI gen for link capability.  Host
>     drivers could add this as a strategy to avoid unnecessary operation for
>     unsupported link speed, for instance, trying to do training for
> -   unsupported link speed, etc.  Must be '4' for gen4, '3' for gen3, '2'
> -   for gen2, and '1' for gen1. Any other values are invalid.
> +   unsupported link speed, etc.  Must be '6' for gen6, '5' for gen5, '4' for
> +   gen4, '3' for gen3, '2' for gen2, and '1' for gen1. Any other values are
> +   invalid.
>  - reset-gpios:
>     If present this property specifies PERST# GPIO. Host drivers can parse the
>     GPIO and apply fundamental reset to endpoints.
> -- 
> 2.25.1
>