[PATCH] dts-bindings: usb-uhci: Document newly added properties

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Commit 4642d34a439f80e16af0d56ed6258a33abae257a
"usb/uhci: Add support for Aspeed BMC SoCs" added
support for a new #ports property, along with
Aspeed specific compatible strings. This adds
documentation for them.

Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/usb/usb-uhci.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/usb-uhci.txt b/Documentation/devicetree/bindings/usb/usb-uhci.txt
index 298133416c97..c1153eb38a9a 100644
--- a/Documentation/devicetree/bindings/usb/usb-uhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-uhci.txt
@@ -3,8 +3,14 @@ Generic Platform UHCI Controller
 
 Required properties:
 - compatible : "generic-uhci" (deprecated: "platform-uhci")
+  supports additional Aspeed specific workarounds by also
+  including the "aspeed,ast2400-uhci" or "aspeed,ast2500-uhci"
+  string.
 - reg : Should contain 1 register ranges(address and length)
 - interrupts : UHCI controller interrupt
+- #ports: (optional) 1 cell, number of ports (overrides
+  auto-detection which is needed among others on some Aspeed
+  parts).
 
 Example:
 


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