dt-bindings: PCI: microchip,pcie-host: Allow dma-noncoherent

JIRA: https://issues.redhat.com/browse/RHEL-83611
Upstream Status: 04aa999eb96fdc8d3cf2b2d98363d6372befaef2

commit 04aa999eb96fdc8d3cf2b2d98363d6372befaef2
Author: Conor Dooley <conor.dooley@microchip.com>
Date:   Fri Oct 11 15:00:43 2024 +0100

    dt-bindings: PCI: microchip,pcie-host: Allow dma-noncoherent

    PolarFire SoC may be configured in a way that requires non-coherent DMA
    handling. On RISC-V, buses are coherent by default & the dma-noncoherent
    property is required to denote buses or devices that are non-coherent.

    Link: https://lore.kernel.org/r/20241011140043.1250030-4-daire.mcnamara@microchip.com


Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rob Herring <robh@kernel.org>

Signed-off-by: Myron Stowe <mstowe@redhat.com>

Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml

@@ -50,6 +50,8 @@ properties:
     items:
       pattern: '^fic[0-3]$'
 
+  dma-coherent: true
+
   ranges:
     minItems: 1
     maxItems: 3