dt-bindings: usb: dwc3: Update dwc3 TX fifo properties

Update the tx-fifo-resize property with a better description, while
adding the tx-fifo-max-num, which is a new parameter allowing
adjustments for the maximum number of packets the txfifo resizing logic
can account for while resizing the endpoints.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/1625908395-5498-7-git-send-email-wcheng@codeaurora.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/snps,dwc3.yaml

@@ -289,10 +289,21 @@ properties:
     maximum: 16
 
   tx-fifo-resize:
-    description: Determines if the FIFO *has* to be reallocated
-    deprecated: true
+    description: Determines if the TX fifos can be dynamically resized depending
+      on the number of IN endpoints used and if bursting is supported.  This
+      may help improve bandwidth on platforms with higher system latencies, as
+      increased fifo space allows for the controller to prefetch data into its
+      internal memory.
     type: boolean
 
+  tx-fifo-max-num:
+    description: Specifies the max number of packets the txfifo resizing logic
+      can account for when higher endpoint bursting is used. (bMaxBurst > 6) The
+      higher the number, the more fifo space the txfifo resizing logic will
+      allocate for that endpoint.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 3
+
   snps,incr-burst-type-adjustment:
     description:
       Value for INCR burst type of GSBUSCFG0 register, undefined length INCR