4 compatible : must be "fsl,<chip>-ucc-uart". For t1040, must be
6 port-number : port number of UCC-UART
7 tx/rx-clock-name : should be "brg1"-"brg16" for internal clock source,
8 should be "clk1"-"clk28" for external clock source.
12 ucc_serial: ucc@2200 {
13 compatible = "fsl,t1040-ucc-uart";
15 rx-clock-name = "brg2";
16 tx-clock-name = "brg2";