MLK-16013-6 Documentation: usb: dwc3: add suspend clk setting

Add dt documentation for specify the suspend clk and its caculation.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index e3e6983..98a5872 100644 (file)
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -53,6 +53,9 @@ Optional properties:
  - snps,quirk-frame-length-adjustment: Value for GFLADJ_30MHZ field of GFLADJ
        register for post-silicon frame length adjustment when the
        fladj_30mhz_sdbnd signal is invalid or incorrect.
+- snps,power-down-scale: Value for number of scale(16kHz) of suspend clock if
+        the default value is not correct, valid range is 2~8000, means suspend
+        clock is from 32KHz to 125MHz.
 
  - <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.