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)
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