Add an outbound iATU-capable memory-region which will be used to send PCIe
message (such as PME_Turn_Off) to peripheral. So all platforms can use
common method to send out PME_Turn_Off message by using one outbound iATU.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
index 022055edbf9e6..25a5420a9ce1e 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
@@ -101,6 +101,10 @@ properties:
             Outbound iATU-capable memory-region which will be used to access
             the peripheral PCIe devices configuration space.
           const: config
+        - description:
+            Outbound iATU-capable memory-region which will be used to send
+            PCIe message (such as PME_Turn_Off) to peripheral.
+          const: msg
         - description:
             Vendor-specific CSR names. Consider using the generic names above
             for new bindings.

-- 
2.34.1

Still has mismatched quotes in subject.