dt-bindings: PCI: qcom: Allow 'dma-coherent' property

Devices on some PCIe buses may be cache coherent and must be marked as
such in the devicetree to avoid data corruption.

This is specifically needed on recent Qualcomm platforms like SC8280XP.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Acked-by: Rob Herring <[email protected]>

Author: jhovold

Documentation/devicetree/bindings/pci/qcom,pcie.yaml

@@ -62,6 +62,8 @@ properties:
     minItems: 3
     maxItems: 13
 
+  dma-coherent: true
+
   interconnects:
     maxItems: 2