scripts/Makefile.dtbs

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