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

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Message-Id: <20250519160448.209461-2-18255117159@163.com>
Date: Tue, 20 May 2025 00:04:46 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	krzk+dt@...nel.org,
	manivannan.sadhasivam@...aro.org,
	conor+dt@...nel.org
Cc: robh@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH 1/3] dt-bindings: PCI: Extend max-link-speed to support PCIe Gen5/Gen6

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(-)

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