1# SPDX-License-Identifier: GPL-2.0
2config DTC
3	bool
4
5menuconfig OF
6	bool "Device Tree and Open Firmware support"
7	help
8	  This option enables the device tree infrastructure.
9	  It is automatically selected by platforms that need it or can
10	  be enabled manually for unittests, overlays or
11	  compile-coverage.
12
13if OF
14
15config OF_UNITTEST
16	bool "Device Tree runtime unit tests"
17	depends on OF_EARLY_FLATTREE
18	select IRQ_DOMAIN
19	select OF_RESOLVE
20	help
21	  This option builds in test cases for the device tree infrastructure
22	  that are executed once at boot time, and the results dumped to the
23	  console.
24
25	  This option should only be enabled for a development kernel. The tests
26	  will taint the kernel with TAINT_TEST. The tests will cause ERROR and
27	  WARNING messages to print on the console. The tests will cause stack
28	  traces to print on the console.  It is possible that the tests will
29	  leave the devicetree in a corrupted state.
30
31	  The unittest output will be verbose.  Copy the output to a file
32	  via capturing the console output or via the dmesg command.  Process
33	  this file with scripts/dtc/of_unittest_expect to reduce the
34	  verbosity, test whether expected output is present, and to
35	  summarize the results.
36
37	  If unsure, say N here. This option is not safe to enable.
38
39config OF_KUNIT_TEST
40	tristate "Devicetree KUnit Test" if !KUNIT_ALL_TESTS
41	depends on KUNIT
42	default KUNIT_ALL_TESTS
43	help
44	  This option builds KUnit unit tests for device tree infrastructure.
45
46	  If unsure, say N here, but this option is safe to enable.
47
48config OF_ALL_DTBS
49	bool "Build all Device Tree Blobs"
50	depends on COMPILE_TEST
51	select DTC
52	help
53	  This option builds all possible Device Tree Blobs (DTBs) for the
54	  current architecture.
55
56	  If unsure, say N here, but this option is safe to enable.
57
58config OF_FLATTREE
59	bool
60	select DTC
61	select LIBFDT
62	select CRC32
63
64config OF_EARLY_FLATTREE
65	def_bool OF && !(SPARC || ALPHA || HEXAGON || M68K || PARISC || S390)
66	select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM
67	select OF_FLATTREE
68
69config OF_PROMTREE
70	bool
71
72config OF_KOBJ
73	def_bool SYSFS
74
75# Hardly any platforms need this.  It is safe to select, but only do so if you
76# need it.
77config OF_DYNAMIC
78	bool "Support for dynamic device trees" if OF_UNITTEST
79	select OF_KOBJ
80	help
81	  On some platforms, the device tree can be manipulated at runtime.
82	  While this option is selected automatically on such platforms, you
83	  can enable it manually to improve device tree unit test coverage.
84
85config OF_ADDRESS
86	def_bool y
87	depends on !SPARC && (HAS_IOMEM || UML)
88
89config OF_IRQ
90	def_bool y
91	depends on !SPARC && IRQ_DOMAIN
92
93config OF_RESERVED_MEM
94	def_bool OF_EARLY_FLATTREE
95
96config OF_RESOLVE
97	bool
98
99config OF_OVERLAY
100	bool "Device Tree overlays"
101	select OF_DYNAMIC
102	select OF_FLATTREE
103	select OF_RESOLVE
104	help
105	  Overlays are a method to dynamically modify part of the kernel's
106	  device tree with dynamically loaded data.
107	  While this option is selected automatically when needed, you can
108	  enable it manually to improve device tree unit test coverage.
109
110config OF_NUMA
111	bool
112
113endif # OF
114