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-rw-r--r--meta/classes/devicetree.bbclass148
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diff --git a/meta/classes/devicetree.bbclass b/meta/classes/devicetree.bbclass
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-# 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 GPL-2.0-only (and in some cases dual
-# licensed). Default to GPL-2.0-only if the recipe does not specify a license.
-LICENSE ?= "GPL-2.0-only"
-LIC_FILES_CHKSUM ?= "file://${COMMON_LICENSE_DIR}/GPL-2.0-only;md5=801f80980d171dd6425610833a22dbe6"
-
-INHIBIT_DEFAULT_DEPS = "1"
-DEPENDS += "dtc-native"
-
-inherit deploy kernel-arch
-
-COMPATIBLE_MACHINE ?= "^$"
-
-PROVIDES = "virtual/dtb"
-
-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, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-
-python devicetree_do_compile() {
- includes = expand_includes("DT_INCLUDE", d)
- listpath = d.getVar("DT_FILES_PATH")
- for dts in os.listdir(listpath):
- dtspath = os.path.join(listpath, dts)
- try:
- if not(os.path.isfile(dtspath)) or not(dts.endswith(".dts") or devicetree_source_is_overlay(dtspath)):
- continue # skip non-.dts files and non-overlay files
- except:
- continue # skip if can't determine if overlay
- 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
-