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>

2 files changed, 11 insertions, 0 deletions

diff --git a/README b/README
index e16dee9..bef13a3 100644
--- a/README
+++ b/README
@@ -189,6 +189,11 @@ kernels.
 NOTE: KERNEL_DEVICETREE is default enabled for kernel >= 3.18 and always disabled for
       older kernel versions.
 
+2.M. Optional - enable SPI bus
+==============================
+When using device tree kernels, set this variable to enable the SPI bus
+ENABLE_SPI_BUS = "1"
+
 3. Extra apps
 =============
 
diff --git a/recipes-bsp/bootfiles/rpi-config_git.bb b/recipes-bsp/bootfiles/rpi-config_git.bb
index 45b9f1d..aa11b25 100644
--- a/recipes-bsp/bootfiles/rpi-config_git.bb
+++ b/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