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

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Message-ID: <c2ddb1ad-72f9-4ebc-8d6a-3c9d7fa559e4@163.com>
Date: Wed, 28 May 2025 13:41:30 +0800
From: Hans Zhang <18255117159@....com>
To: Rob Herring <robh@...nel.org>
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 2025/5/28 03:35, Rob Herring wrote:
> 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.
> 

Dear Rob,

Thank you very much for your reply and reminder. I will resubmit in the 
next version.

Best regards,
Hans

>>
>> 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
>>