[PATCHv2 2/2] Documentation: dt: add an optional dma-desc-enable property for dwc2 usb

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From: Dinh Nguyen <dinguyen@xxxxxxxxxx>

The "dma-desc-enable" property can be used to enable descriptor DMA mode
for the DWC2 USB IP.

Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
---
v2: Reword property description to enable instead of disable
---
 Documentation/devicetree/bindings/usb/dwc2.txt |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/dwc2.txt b/Documentation/devicetree/bindings/usb/dwc2.txt
index b8b6871..9b471b5 100644
--- a/Documentation/devicetree/bindings/usb/dwc2.txt
+++ b/Documentation/devicetree/bindings/usb/dwc2.txt
@@ -14,6 +14,13 @@ Refer to clk/clock-bindings.txt for generic clock consumer properties
 Optional properties:
 - phys: phy provider specifier
 - phy-names: shall be "device"
+- dma-desc-enable: Should be <1> to enable descriptor dma mode. This
+	property is used to enable descriptor DMA support. The reason why
+	this property is needed is because the HW supports descriptor DMA
+	mode, but descriptor dma mode will not support SPLIT transactions.
+	So this property can be used to optionally enable descriptor DMA
+	support.
+
 Refer to phy/phy-bindings.txt for generic phy consumer properties
 
 Example:
-- 
1.7.9.5

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