[PATCH v6 1/7] dt-bindings: PCI: altera: Add binding for Agilex

[Matthew Gerlach <matthew.gerlach@linux.intel.com>]

Add the compatible bindings for the three variants of Agilex
PCIe Hard IP.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
---
v6:
 - Enhance compatible description.

v3:
 - Remove accepted patches from patch set.
---
 .../devicetree/bindings/pci/altr,pcie-root-port.yaml   | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml b/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
index 52533fccc134..1f93120d8eef 100644
--- a/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
+++ b/Documentation/devicetree/bindings/pci/altr,pcie-root-port.yaml
@@ -12,9 +12,19 @@ maintainers:
 
 properties:
   compatible:
+    description: Each family of socfpga has its own implementation
+      of the pci controller. altr,pcie-root-port-1.0 is used for the Cyclone5
+      family of chips. The Stratix10 family of chips is supported
+      by altr,pcie-root-port-2.0. The Agilex family of chips has
+      three, non-register compatible, variants of PCIe Hard IP referred to as
+      the f-tile, p-tile, and r-tile, depending on the specific chip instance.
+
     enum:
       - altr,pcie-root-port-1.0
       - altr,pcie-root-port-2.0
+      - altr,pcie-root-port-3.0-f-tile
+      - altr,pcie-root-port-3.0-p-tile
+      - altr,pcie-root-port-3.0-r-tile
 
   reg:
     items:
-- 
2.34.1