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