[PATCH] dt-bindings: PCI: rcar-gen4-pci-host: Document optional msi-parent

The R-Car Gen4 PCIe controller can optionally use GIC ITS as an
MSI controller. This configuration is described in DT by setting
msi-parent DT property in the PCIe controller node. Document this
configuration.

Signed-off-by: Marek Vasut <[email protected]>
---
Cc: "Krzysztof Wilczyński" <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Koichiro Den <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Manivannan Sadhasivam <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Yoshihiro Shimoda <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
---
 Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
index bb3f843c59d91..64f456c6a75a1 100644
--- a/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
+++ b/Documentation/devicetree/bindings/pci/rcar-gen4-pci-host.yaml
@@ -66,6 +66,9 @@ properties:
   max-link-speed:
     maximum: 4
 
+  msi-parent:
+    maxItems: 1
+
   num-lanes:
     maximum: 4
 
-- 
2.53.0