[PATCH v3 1/6] dt-bindings: usb: xhci: add property to disable xhci 64bit support

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Add a property "xhci-64bit-support-disable" to disable xhci 64bit address
dma, some SoC integration may not support 64bit DMA but the AC64 bit
(bit 0) of HCCPARAMS1 is kept to be 1.

Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
 Documentation/devicetree/bindings/usb/usb-xhci.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
index 0c5cff8..26446fb 100644
--- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
@@ -28,6 +28,9 @@ Optional properties:
   - quirk-broken-port-ped: set if the controller has broken port disable mechanism
   - imod-interval-ns: default interrupt moderation interval is 5000ns
   - phys : see usb-hcd.yaml in the current directory
+  - xhci-64bit-support-disable: set if the AC64 bit (bit 0) of HCCPARAMS1 is
+    set to be 1, but the controller actually can't handle 64-bit address
+    due to SoC integration.
 
 additionally the properties from usb-hcd.yaml (in the current directory) are
 supported.
-- 
2.7.4




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