title: How discover the device /dev
body: <p>on my embedded device (RTOS Yocto) there are two serial link (RS232 and RS485) but I don't have a full documentation so I 'm not able to find the right node ( under /dev ) to open for R\W operation
  The *.dtsi file is not help me and udev shell also, maybe because I get several info but not how is engagged the node</p>
  <p>Any suggestion?</p>
  <p>P</p>