Hi Jassi,

quoted

If yes, how should it be reflected in DT?
- 1 cell: &mu [0-15]
- 2 cells: &mu [0-7] [TX,RX]
- 3 cells: &mu [0-4] [FIFO,NOFIFO] [TX,RX]

It may be possible for a device binding to have variable cells, but I haven't
seen any. And I am not sure that would look neat either.

Please refer to 
Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
- #interrupt-cells : Specifies the number of cells needed to encode an
  interrupt source. Must be a single cell with a value of at least 3.
  If the system requires describing PPI affinity, then the value must
  be at least 4.

Regards
Dong Aisheng