Documentation: of: Document the bindings used by Juno R1 PCIe host bridge

ARM's Juno R1 board used PLDA XpressRICH3-AXI IP to implement a PCIe host
bridge. Introduce "plda" as vendor prefix for PLDA and document the DT
bindings for PLDA XpressRICH3-AXI IP as well as ARM's Juno R1.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/pci/arm,juno-r1-pcie.txt b/Documentation/devicetree/bindings/pci/arm,juno-r1-pcie.txt
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index 000000000000..f7514c170a32
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+++ b/Documentation/devicetree/bindings/pci/arm,juno-r1-pcie.txt
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+* ARM Juno R1 PCIe interface
+
+This PCIe host controller is based on PLDA XpressRICH3-AXI IP
+and thus inherits all the common properties defined in plda,xpressrich3-axi.txt
+as well as the base properties defined in host-generic-pci.txt.
+
+Required properties:
+ - compatible: "arm,juno-r1-pcie"
+ - dma-coherent: The host controller bridges the AXI transactions into PCIe bus
+   in a manner that makes the DMA operations to appear coherent to the CPUs.