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