Makefile.dtbs

  1# SPDX-License-Identifier: GPL-2.0-only
  2
  3all-dtb := $(dtb-y) $(dtb-)
  4
  5# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
  6dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
  7
  8# Composite DTB (i.e. DTB constructed by overlay)
  9multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
 10# Primitive DTB compiled from *.dts
 11real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
 12# Base DTB that overlay is applied onto
 13base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
 14
 15# Ensure that any .dtbo is applied to at least one base .dtb. Otherwise, it
 16# does not get validated.
 17applied-dtbo := $(filter %.dtbo, \
 18	$(call real-search, $(call multi-search, $(all-dtb), .dtb, -dtbs), .dtb, -dtbs))
 19unapplied-dtbo := $(filter-out $(applied-dtbo),$(filter %.dtbo, $(dtb-y)))
 20$(if $(unapplied-dtbo), $(warning .dtbo is not applied to any base: $(unapplied-dtbo)))
 21
 22dtb-y           := $(addprefix $(obj)/, $(dtb-y))
 23multi-dtb-y     := $(addprefix $(obj)/, $(multi-dtb-y))
 24real-dtb-y      := $(addprefix $(obj)/, $(real-dtb-y))
 25
 26always-y        += $(dtb-y)
 27targets         += $(real-dtb-y)
 28
 29# dtbs-list
 30# ---------------------------------------------------------------------------
 31
 32ifdef need-dtbslist
 33subdir-dtbslist := $(addsuffix /dtbs-list, $(subdir-ym))
 34dtb-y           += $(subdir-dtbslist)
 35always-y        += $(obj)/dtbs-list
 36endif
 37
 38$(subdir-dtbslist): $(obj)/%/dtbs-list: $(obj)/% ;
 39
 40$(obj)/dtbs-list: $(dtb-y) FORCE
 41	$(call if_changed,gen_order)
 42
 43# Assembly file to wrap dtb(o)
 44# ---------------------------------------------------------------------------
 45
 46builtin-dtb-section = $(if $(filter arch/$(SRCARCH)/boot/dts%, $(obj)),.dtb.init.rodata,.rodata)
 47
 48# Generate an assembly file to wrap the output of the device tree compiler
 49quiet_cmd_wrap_S_dtb = WRAP    $@
 50      cmd_wrap_S_dtb = {								\
 51		symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*));	\
 52		echo '\#include <asm-generic/vmlinux.lds.h>';				\
 53		echo '.section $(builtin-dtb-section),"a"';				\
 54		echo '.balign STRUCT_ALIGNMENT';					\
 55		echo ".global $${symbase}_begin";					\
 56		echo "$${symbase}_begin:";						\
 57		echo '.incbin "$<" ';							\
 58		echo ".global $${symbase}_end";						\
 59		echo "$${symbase}_end:";						\
 60		echo '.balign STRUCT_ALIGNMENT';					\
 61	} > $@
 62
 63$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 64	$(call if_changed,wrap_S_dtb)
 65
 66$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE
 67	$(call if_changed,wrap_S_dtb)
 68
 69# Schema check
 70# ---------------------------------------------------------------------------
 71
 72ifneq ($(CHECK_DTBS),)
 73DT_CHECKER ?= dt-validate
 74DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
 75DT_BINDING_DIR := Documentation/devicetree/bindings
 76DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
 77dtb-check-enabled = $(if $(filter %.dtb, $@),y)
 78endif
 79
 80quiet_dtb_check_tag = $(if $(dtb-check-enabled),[C],   )
 81cmd_dtb_check = $(if $(dtb-check-enabled),; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true)
 82
 83# Overlay
 84# ---------------------------------------------------------------------------
 85
 86# NOTE:
 87# Do not replace $(filter %.dtb %.dtbo, $^) with $(real-prereqs). When a single
 88# DTB is turned into a multi-blob DTB, $^ will contain header file dependencies
 89# recorded in the .*.cmd file.
 90quiet_cmd_fdtoverlay = OVL $(quiet_dtb_check_tag) $@
 91      cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(filter %.dtb %.dtbo, $^) $(cmd_dtb_check)
 92
 93$(multi-dtb-y): $(DT_TMP_SCHEMA) FORCE
 94	$(call if_changed,fdtoverlay)
 95$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)
 96
 97# DTC
 98# ---------------------------------------------------------------------------
 99
100DTC ?= $(objtree)/scripts/dtc/dtc
101DTC_FLAGS += -Wno-unique_unit_address
102
103# Disable noisy checks by default
104ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
105DTC_FLAGS += -Wno-unit_address_vs_reg \
106             -Wno-avoid_unnecessary_addr_size \
107             -Wno-alias_paths \
108             -Wno-graph_child_address \
109             -Wno-interrupt_map \
110             -Wno-simple_bus_reg
111else
112DTC_FLAGS += -Wunique_unit_address_if_enabled
113endif
114
115ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
116DTC_FLAGS += -Wnode_name_chars_strict \
117             -Wproperty_name_chars_strict \
118             -Wunique_unit_address
119endif
120
121DTC_FLAGS += $(DTC_FLAGS_$(target-stem))
122
123# Set -@ if the target is a base DTB that overlay is applied onto
124DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
125
126DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
127
128dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc -I $(DTC_INCLUDE) -undef -D__DTS__
129
130dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
131
132quiet_cmd_dtc = DTC $(quiet_dtb_check_tag) $@
133      cmd_dtc = \
134	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
135	$(DTC) -o $@ -b 0 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) \
136	       $(DTC_FLAGS) -d $(depfile).dtc.tmp $(dtc-tmp) ; \
137	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) \
138	$(cmd_dtb_check)
139
140$(obj)/%.dtb: $(obj)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
141	$(call if_changed_dep,dtc)
142
143$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
144	$(call if_changed_dep,dtc)
145
146# targets
147# ---------------------------------------------------------------------------
148
149targets += $(always-y)
150
151# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
152# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
153targets += $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
154           $(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo)