1# SPDX-License-Identifier: GPL-2.0-only
2
3# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
4dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
5
6# Composite DTB (i.e. DTB constructed by overlay)
7multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
8# Primitive DTB compiled from *.dts
9real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
10# Base DTB that overlay is applied onto
11base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs))
12
13dtb-y           := $(addprefix $(obj)/, $(dtb-y))
14multi-dtb-y     := $(addprefix $(obj)/, $(multi-dtb-y))
15real-dtb-y      := $(addprefix $(obj)/, $(real-dtb-y))
16
17always-y        += $(dtb-y)
18targets         += $(real-dtb-y)
19
20# dtbs-list
21# ---------------------------------------------------------------------------
22
23ifdef need-dtbslist
24subdir-dtbslist := $(addsuffix /dtbs-list, $(subdir-ym))
25dtb-y           += $(subdir-dtbslist)
26always-y        += $(obj)/dtbs-list
27endif
28
29$(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
37builtin-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
40quiet_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	$(call if_changed,wrap_S_dtb)
59
60# Schema check
61# ---------------------------------------------------------------------------
62
63ifneq ($(CHECK_DTBS),)
64DT_CHECKER ?= dt-validate
65DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
66DT_BINDING_DIR := Documentation/devicetree/bindings
67DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
68dtb-check-enabled = $(if $(filter %.dtb, $@),y)
69endif
70
71quiet_dtb_check_tag = $(if $(dtb-check-enabled),[C],   )
72cmd_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.
81quiet_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
91DTC ?= $(objtree)/scripts/dtc/dtc
92DTC_FLAGS += -Wno-unique_unit_address
93
94# Disable noisy checks by default
95ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
96DTC_FLAGS += -Wno-unit_address_vs_reg \
97             -Wno-avoid_unnecessary_addr_size \
98             -Wno-alias_paths \
99             -Wno-graph_child_address \
100             -Wno-simple_bus_reg
101else
102DTC_FLAGS += -Wunique_unit_address_if_enabled
103endif
104
105ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
106DTC_FLAGS += -Wnode_name_chars_strict \
107             -Wproperty_name_chars_strict \
108             -Wunique_unit_address
109endif
110
111DTC_FLAGS += $(DTC_FLAGS_$(target-stem))
112
113# Set -@ if the target is a base DTB that overlay is applied onto
114DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)
115
116DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
117
118dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc -I $(DTC_INCLUDE) -undef -D__DTS__
119
120dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
121
122quiet_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
139targets += $(always-y)
140
141# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
142# %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
143targets += $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
144           $(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo)
145