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_ALL_DTBS 40 bool "Build all Device Tree Blobs" 41 depends on COMPILE_TEST 42 select DTC 43 help 44 This option builds all possible Device Tree Blobs (DTBs) for the 45 current architecture. 46 47 If unsure, say N here, but this option is safe to enable. 48 49config OF_FLATTREE 50 bool 51 select DTC 52 select LIBFDT 53 select CRC32 54 55config OF_EARLY_FLATTREE 56 def_bool OF && !(SPARC || ALPHA || HEXAGON || M68K || PARISC || S390) 57 select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM 58 select OF_FLATTREE 59 60config OF_PROMTREE 61 bool 62 63config OF_KOBJ 64 def_bool SYSFS 65 66# Hardly any platforms need this. It is safe to select, but only do so if you 67# need it. 68config OF_DYNAMIC 69 bool "Support for dynamic device trees" if OF_UNITTEST 70 select OF_KOBJ 71 help 72 On some platforms, the device tree can be manipulated at runtime. 73 While this option is selected automatically on such platforms, you 74 can enable it manually to improve device tree unit test coverage. 75 76config OF_ADDRESS 77 def_bool y 78 depends on !SPARC && (HAS_IOMEM || UML) 79 80config OF_IRQ 81 def_bool y 82 depends on !SPARC && IRQ_DOMAIN 83 84config OF_RESERVED_MEM 85 def_bool OF_EARLY_FLATTREE 86 87config OF_RESOLVE 88 bool 89 90config OF_OVERLAY 91 bool "Device Tree overlays" 92 select OF_DYNAMIC 93 select OF_FLATTREE 94 select OF_RESOLVE 95 help 96 Overlays are a method to dynamically modify part of the kernel's 97 device tree with dynamically loaded data. 98 While this option is selected automatically when needed, you can 99 enable it manually to improve device tree unit test coverage. 100 101config OF_NUMA 102 bool 103 104endif # OF 105