rpi-config: SPI bus support

With the newer kernels that use device tree, the SPI bus is only
enabled by a device tree setting.  This is now supported by adding
  ENABLE_SPI_BUS = "1"
in local.conf

Signed-off-by: Gary Thomas <gary@mlbassoc.com>

recipes-bsp/bootfiles/rpi-config_git.bb

@@ -66,6 +66,12 @@ do_deploy() {
         echo "# Enable offline compositing" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
         echo "dispmanx_offline=1" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
     fi
+
+    # SPI bus support
+    if [ -n "${ENABLE_SPI_BUS}" ]; then
+        echo "# Enable SPI bus" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+        echo "dtparam=spi=on" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+    fi
 }
 
 addtask deploy before do_package after do_install