1 # SPDX-License-Identifier: GPL-2.0
6 bool "Device Tree and Open Firmware support"
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
16 bool "Device Tree runtime unit tests"
17 depends on OF_EARLY_FLATTREE
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
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.
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.
37 If unsure, say N here. This option is not safe to enable.
40 tristate "Devicetree KUnit Test" if !KUNIT_ALL_TESTS
42 default KUNIT_ALL_TESTS
44 This option builds KUnit unit tests for device tree infrastructure.
46 If unsure, say N here, but this option is safe to enable.
49 bool "Build all Device Tree Blobs"
50 depends on COMPILE_TEST
53 This option builds all possible Device Tree Blobs (DTBs) for the
56 If unsure, say N here, but this option is safe to enable.
64 config OF_EARLY_FLATTREE
65 def_bool OF && !(SPARC || ALPHA || HEXAGON || M68K || PARISC || S390)
66 select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM
75 # Hardly any platforms need this. It is safe to select, but only do so if you
78 bool "Support for dynamic device trees" if OF_UNITTEST
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.
87 depends on !SPARC && (HAS_IOMEM || UML)
91 depends on !SPARC && IRQ_DOMAIN
93 config OF_RESERVED_MEM
94 def_bool OF_EARLY_FLATTREE
100 bool "Device Tree overlays"
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.