Test  driver pca953x command "pca953x" with  parament "start",  that will init pca9533  and change all LEDs status to OFF state, and test  passed!!

NOTE:

NuttShell (NSH)
nsh> pca953x start
[PCA953X] on I2C bus 2 at 0x62
nsh>

then, check your LED state, supposed to be turned OFF.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>