[PATCH 1/2] dt-bindings: PCI: Add linux,pci-domain-reuse property

[Cui Chao]

Add a new optional boolean property 'linux,pci-domain-reuse' for PCI
host bridges.

By default, the 'linux,pci-domain' property must be unique across all
host bridges. This property allows a host bridge to explicitly opt-out
of this uniqueness check, permitting multiple host bridges to reuse the
same software domain number.

Host bridges reusing the same domain number must have disjoint ECAM,
bus-range, memory, and IO windows so that (domain, bus) tuples remain
globally unique.

Co-developed-by: Wang Yinfeng <wangyinfeng at phytium.com.cn>
Signed-off-by: Wang Yinfeng <wangyinfeng at phytium.com.cn>
Signed-off-by: Cui Chao <cuichao1753 at phytium.com.cn>
---
 .../devicetree/bindings/pci/host-generic-pci.yaml      | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
index 420d551e9af9..1b439e2f38af 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.yaml
@@ -114,6 +114,16 @@ properties:
       Requests with Address Type (AT).
     type: boolean
 
+  linux,pci-domain-reuse:
+    description:
+      Boolean indicating that this host bridge is allowed to reuse the same
+      "linux,pci-domain" value as another host bridge on the platform. Host
+      bridges reusing the same domain must have disjoint ECAM, bus-range,
+      memory, and IO windows so that (domain, bus) tuples remain globally
+      unique. A duplicate domain on a host bridge without this property
+      remains an error.
+    type: boolean
+
 required:
   - compatible
   - reg
-- 
2.33.0