PCI: iproc: Add optional dma-ranges

Add description for optional device tree property 'dma-ranges' for inbound
mapping.

Signed-off-by: Oza Oza <oza.oza@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>

diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index f827b8d394e2582bdd005e333cc23267684b5e28..5dbfb82ef88cdcf667762d2212768c8588718c1a 100644 (file)
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -25,6 +25,9 @@ Optional properties:
 - phys: phandle of the PCIe PHY device
 - phy-names: must be "pcie-phy"
 - dma-coherent: present if DMA operations are coherent
+- dma-ranges: Some PAXB-based root complexes do not have inbound mapping done
+  by the ASIC after power on reset.  In this case, SW is required to configure
+the mapping, based on inbound memory regions specified by this property.
 
 - brcm,pcie-ob: Some iProc SoCs do not have the outbound address mapping done
 by the ASIC after power on reset. In this case, SW needs to configure it