title: Linux kernel Controller as SPI slave
body: <p>I am interested in working on SPI devices available in linux.
  I have a specific controller which supports SPI in both master and slave mode.
  I have to configure the SPI controller in slave mode.</p>
  
  <p><strong>My question: Does the Linux frame work support SPI slaves?
  I will get asynchronous data on SPI bus, I have to read this data and process it, then send back  a command.</strong></p>