Import class from OE/thud

This is required by the xlilinx recipes to build the u-boot.

Change-Id: I483eb23e8592a79989b82b7e1f511a03b50e168d
Signed-off-by: Adrian Mangeac <Adrian.Mangeac@enea.com>

1 files changed, 143 insertions, 0 deletions

diff --git a/classes/devicetree.bbclass b/classes/devicetree.bbclass
new file mode 100644
index 0000000..8fe5a5e
--- /dev/null
+++ b/classes/devicetree.bbclass
@@ -0,0 +1,143 @@
+# This bbclass implements device tree compliation for user provided device tree
+# sources. The compilation of the device tree sources is the same as the kernel
+# device tree compilation process, this includes being able to include sources
+# from the kernel such as soc dtsi files or header files such as gpio.h. In
+# addition to device trees this bbclass also handles compilation of device tree
+# overlays.
+#
+# The output of this class behaves similar to how kernel-devicetree.bbclass
+# operates in that the output files are installed into /boot/devicetree.
+# However this class on purpose separates the deployed device trees into the
+# 'devicetree' subdirectory. This prevents clashes with the kernel-devicetree
+# output. Additionally the device trees are populated into the sysroot for
+# access via the sysroot from within other recipes.
+
+SECTION ?= "bsp"
+
+# The default inclusion of kernel device tree includes and headers means that
+# device trees built with them are at least GPLv2 (and in some cases dual
+# licensed). Default to GPLv2 if the recipe does not specify a license.
+LICENSE ?= "GPLv2"
+LIC_FILES_CHKSUM ?= "file://${COMMON_LICENSE_DIR}/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
+
+INHIBIT_DEFAULT_DEPS = "1"
+DEPENDS += "dtc-native"
+
+inherit deploy kernel-arch
+
+COMPATIBLE_MACHINE ?= "^$"
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
+SYSROOT_DIRS += "/boot/devicetree"
+FILES_${PN} = "/boot/devicetree/*.dtb /boot/devicetree/*.dtbo"
+
+S = "${WORKDIR}"
+B = "${WORKDIR}/build"
+
+# Default kernel includes, these represent what are normally used for in-kernel
+# sources.
+KERNEL_INCLUDE ??= " \
+        ${STAGING_KERNEL_DIR}/arch/${ARCH}/boot/dts \
+        ${STAGING_KERNEL_DIR}/arch/${ARCH}/boot/dts/* \
+        ${STAGING_KERNEL_DIR}/scripts/dtc/include-prefixes \
+        "
+
+DT_INCLUDE[doc] = "Search paths to be made available to both the device tree compiler and preprocessor for inclusion."
+DT_INCLUDE ?= "${DT_FILES_PATH} ${KERNEL_INCLUDE}"
+DT_FILES_PATH[doc] = "Defaults to source directory, can be used to select dts files that are not in source (e.g. generated)."
+DT_FILES_PATH ?= "${S}"
+
+DT_PADDING_SIZE[doc] = "Size of padding on the device tree blob, used as extra space typically for additional properties during boot."
+DT_PADDING_SIZE ??= "0x3000"
+DT_RESERVED_MAP[doc] = "Number of reserved map entires."
+DT_RESERVED_MAP ??= "8"
+DT_BOOT_CPU[doc] = "The boot cpu, defaults to 0"
+DT_BOOT_CPU ??= "0"
+
+DTC_FLAGS ?= "-R ${DT_RESERVED_MAP} -b ${DT_BOOT_CPU}"
+DTC_PPFLAGS ?= "-nostdinc -undef -D__DTS__ -x assembler-with-cpp"
+DTC_BFLAGS ?= "-p ${DT_PADDING_SIZE}"
+DTC_OFLAGS ?= "-p 0 -@ -H epapr"
+
+python () {
+    if d.getVar("KERNEL_INCLUDE"):
+        # auto add dependency on kernel tree, but only if kernel include paths
+        # are specified.
+        d.appendVarFlag("do_compile", "depends", " virtual/kernel:do_configure")
+}
+
+def expand_includes(varname, d):
+    import glob
+    includes = set()
+    # expand all includes with glob
+    for i in (d.getVar(varname) or "").split():
+        for g in glob.glob(i):
+            if os.path.isdir(g): # only add directories to include path
+                includes.add(g)
+    return includes
+
+def devicetree_source_is_overlay(path):
+    # determine if a dts file is an overlay by checking if it uses "/plugin/;"
+    with open(path, "r") as f:
+        for i in f:
+            if i.startswith("/plugin/;"):
+                return True
+    return False
+
+def devicetree_compile(dtspath, includes, d):
+    import subprocess
+    dts = os.path.basename(dtspath)
+    dtname = os.path.splitext(dts)[0]
+    bb.note("Processing {0} [{1}]".format(dtname, dts))
+
+    # preprocess
+    ppargs = d.getVar("BUILD_CPP").split()
+    ppargs += (d.getVar("DTC_PPFLAGS") or "").split()
+    for i in includes:
+        ppargs.append("-I{0}".format(i))
+    ppargs += ["-o", "{0}.pp".format(dts), dtspath]
+    bb.note("Running {0}".format(" ".join(ppargs)))
+    subprocess.run(ppargs, check = True)
+
+    # determine if the file is an overlay or not (using the preprocessed file)
+    isoverlay = devicetree_source_is_overlay("{0}.pp".format(dts))
+
+    # compile
+    dtcargs = ["dtc"] + (d.getVar("DTC_FLAGS") or "").split()
+    if isoverlay:
+        dtcargs += (d.getVar("DTC_OFLAGS") or "").split()
+    else:
+        dtcargs += (d.getVar("DTC_BFLAGS") or "").split()
+    for i in includes:
+        dtcargs += ["-i", i]
+    dtcargs += ["-o", "{0}.{1}".format(dtname, "dtbo" if isoverlay else "dtb")]
+    dtcargs += ["-I", "dts", "-O", "dtb", "{0}.pp".format(dts)]
+    bb.note("Running {0}".format(" ".join(dtcargs)))
+    subprocess.run(dtcargs, check = True)
+
+python devicetree_do_compile() {
+    includes = expand_includes("DT_INCLUDE", d)
+    listpath = d.getVar("DT_FILES_PATH")
+    for dts in os.listdir(listpath):
+        if not dts.endswith(".dts"):
+            continue # skip non-.dts files
+        dtspath = os.path.join(listpath, dts)
+        devicetree_compile(dtspath, includes, d)
+}
+
+devicetree_do_install() {
+    for DTB_FILE in `ls *.dtb *.dtbo`; do
+        install -Dm 0644 ${B}/${DTB_FILE} ${D}/boot/devicetree/${DTB_FILE}
+    done
+}
+
+devicetree_do_deploy() {
+    for DTB_FILE in `ls *.dtb *.dtbo`; do
+        install -Dm 0644 ${B}/${DTB_FILE} ${DEPLOYDIR}/devicetree/${DTB_FILE}
+    done
+}
+addtask deploy before do_build after do_install
+
+EXPORT_FUNCTIONS do_compile do_install do_deploy
+