[PATCH V2 1/2] dt-bindings: Add PCIe "preserve-boot-config" property

Vidya Sagar
2024-01-10T03:08:01Z

The existing "linux,pci-probe-only" property applies at a system level
and it is not possible to selectively convey individual host bridge's
requirement w.r.t preserving the boot configuration done by the platform
firmware to the kernel. "preserve-boot-config" addresses that concern
and can be used to preserve the boot configuration for host bridges
selectivey.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V2:
* None

Documentation/devicetree/bindings/pci/pci.txt | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
index 6a8f2874a24d..0a5ff998cbe8 100644
--- a/Documentation/devicetree/bindings/pci/pci.txt
+++ b/Documentation/devicetree/bindings/pci/pci.txt
@@ -32,6 +32,10 @@ driver implementation may support the following properties:
root port to downstream device and host bridge drivers can do programming
which depends on CLKREQ signal existence. For example, programming root port
not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal.
+- preserve-boot-config:
+ If present this property specifies that this host bridge is already
+ configured by the platform firmware and the OS doesn't need to reconfigure
+ it again.

PCI-PCI Bridge properties
-------------------------
--
2.25.1