title: Serial Linux embedded Driver with GPIO
body: <p>i'm trying to develop a driver to communicate with a device.
  My driver use sysfs to communicate with userspace, and use rs232 to send/receive information from extern device. My Boad and the other device communicate through rs232, but i don't know how to initialise this communication in driver with my rx,tx, cts/rts.
  I see lot of information about tty. But nothing about using directly GPIO for rs232 communication.</p>
  
  <p>The structure
  <p>
  User -> Board    </p>
  
  <p>|-----rx------|<br>
  |-----tx------|<br>
  |-----cts-----|<br></p>
  
  <p>device</p>
  
  <p><p>
  If someone have an idea :)</p>
  
  <p>Thanks you</p>