kernel: Move Device Tree support to kernel.bbclass

The Device Tree is commonly used but it is still kept as a .inc file
instead of a proper class. Instead now we move the Device Tree code to
a kernel-devicetree class and automatically enable it when the
KERNEL_DEVICETREE variable is set.

To avoid breakage in existing layers, we kept a linux-dtb.inc file
which raises a warning telling the user about the change so in next
release this can be removed.

(From OE-Core rev: 03a00be7f2062aefef0e51ef20a4c9737f6685e7)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 65 insertions, 0 deletions

diff --git a/meta/classes/kernel-devicetree.bbclass b/meta/classes/kernel-devicetree.bbclass
new file mode 100644
index 0000000000..72814ca224
--- /dev/null
+++ b/meta/classes/kernel-devicetree.bbclass
@@ -0,0 +1,62 @@
+# Support for device tree generation
+PACKAGES_append = " kernel-devicetree"
+FILES_kernel-devicetree = "/${KERNEL_IMAGEDEST}/*.dtb /${KERNEL_IMAGEDEST}/*.dtbo"
+
+normalize_dtb () {
+        DTB="$1"
+        if echo ${DTB} | grep -q '/dts/'; then
+                bbwarn "${DTB} contains the full path to the the dts file, but only the dtb name should be used."
+                DTB=`basename ${DTB} | sed 's,\.dts$,.dtb,g'`
+        fi
+        echo "${DTB}"
+}
+
+get_real_dtb_path_in_kernel () {
+        DTB="$1"
+        DTB_PATH="${B}/arch/${ARCH}/boot/dts/${DTB}"
+        if [ ! -e "${DTB_PATH}" ]; then
+                DTB_PATH="${B}/arch/${ARCH}/boot/${DTB}"
+        fi
+        echo "${DTB_PATH}"
+}
+
+do_compile_append() {
+        for DTB in ${KERNEL_DEVICETREE}; do
+                DTB=`normalize_dtb "${DTB}"`
+                oe_runmake ${DTB}
+        done
+}
+
+do_install_append() {
+        for DTB in ${KERNEL_DEVICETREE}; do
+                DTB=`normalize_dtb "${DTB}"`
+                DTB_EXT=${DTB##*.}
+                DTB_PATH=`get_real_dtb_path_in_kernel "${DTB}"`
+                DTB_BASE_NAME=`basename ${DTB} ."${DTB_EXT}"`
+                install -m 0644 ${DTB_PATH} ${D}/${KERNEL_IMAGEDEST}/${DTB_BASE_NAME}.${DTB_EXT}
+                for type in ${KERNEL_IMAGETYPE_FOR_MAKE}; do
+                        symlink_name=${type}"-"${KERNEL_IMAGE_SYMLINK_NAME}
+                        DTB_SYMLINK_NAME=`echo ${symlink_name} | sed "s/${MACHINE}/${DTB_BASE_NAME}/g"`
+                        ln -sf ${DTB_BASE_NAME}.${DTB_EXT} ${D}/${KERNEL_IMAGEDEST}/devicetree-${DTB_SYMLINK_NAME}.${DTB_EXT}
+                done
+        done
+}
+
+do_deploy_append() {
+        for DTB in ${KERNEL_DEVICETREE}; do
+                DTB=`normalize_dtb "${DTB}"`
+                DTB_EXT=${DTB##*.}
+                DTB_BASE_NAME=`basename ${DTB} ."${DTB_EXT}"`
+                for type in ${KERNEL_IMAGETYPE_FOR_MAKE}; do
+                        base_name=${type}"-"${KERNEL_IMAGE_BASE_NAME}
+                        symlink_name=${type}"-"${KERNEL_IMAGE_SYMLINK_NAME}
+                        DTB_NAME=`echo ${base_name} | sed "s/${MACHINE}/${DTB_BASE_NAME}/g"`
+                        DTB_SYMLINK_NAME=`echo ${symlink_name} | sed "s/${MACHINE}/${DTB_BASE_NAME}/g"`
+                        DTB_PATH=`get_real_dtb_path_in_kernel "${DTB}"`
+                        install -d ${DEPLOYDIR}
+                        install -m 0644 ${DTB_PATH} ${DEPLOYDIR}/${DTB_NAME}.${DTB_EXT}
+                        ln -sf ${DTB_NAME}.${DTB_EXT} ${DEPLOYDIR}/${DTB_SYMLINK_NAME}.${DTB_EXT}
+                        ln -sf ${DTB_NAME}.${DTB_EXT} ${DEPLOYDIR}/${DTB_BASE_NAME}.${DTB_EXT}
+                done
+        done
+}
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 02a5e961cb..0ad522d167 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -662,3 +662,6 @@ do_deploy[prefuncs] += "package_get_auto_pr"
 addtask deploy after do_populate_sysroot do_packagedata
 
 EXPORT_FUNCTIONS do_deploy
+
+# Add using Device Tree support
+inherit kernel-devicetree