title: More than two SPI devices on an Arm board that supports only two?
body: <p>The Arm processor on one of our boards has an spi port with two chip select lines.
  It is mentioned in the processor's datasheet that it can control upto two spi devices.</p>
  
  <p>Is it possible to use a GPIO as a slave select for an additional spi device?
  How to modify the existing libraries/device drivers to support this change?</p>
  
  <p>So far i've found a file in the kernel's source which contains the addresses of SPI port pins. Can anyone plz tell in which direction should i proceed?</p>