PCI: rcar: Allow DT to override default window settings

If the DTB specifies dma-ranges, use those values.  Otherwise, default to
the values that were previously hardcoded into the driver.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt b/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
index 7fab84b33531..891463cb09c2 100644
--- a/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
+++ b/Documentation/devicetree/bindings/pci/pci-rcar-gen2.txt
@@ -24,6 +24,11 @@ Required properties:
 - interrupt-map-mask: standard property that helps to define the interrupt
   mapping.
 
+Optional properties:
+- dma-ranges: a single range for the inbound memory region. If not supplied,
+  defaults to 1GiB at 0x40000000. Note there are hardware restrictions on the
+  allowed combinations of address and size.
+
 Example SoC configuration:
 
         pci0: pci@ee090000  {
@@ -38,6 +43,7 @@ Example SoC configuration:
                 #address-cells = <3>;
                 #size-cells = <2>;
                 #interrupt-cells = <1>;
+                dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0 0x40000000>;
                 interrupt-map-mask = <0xff00 0 0 0x7>;
                 interrupt-map = <0x0000 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH
                                  0x0800 0 0 1 &gic 0 108 IRQ_TYPE_LEVEL_HIGH