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+# SPDX-License-Identifier: GPL-2.0
+config DTC
+ bool
+
+menuconfig OF
+ bool "Device Tree and Open Firmware support"
+ help
+ This option enables the device tree infrastructure.
+ It is automatically selected by platforms that need it or can
+ be enabled manually for unittests, overlays or
+ compile-coverage.
+
+if OF
+
+config OF_UNITTEST
+ bool "Device Tree runtime unit tests"
+ depends on !SPARC
+ select IRQ_DOMAIN
+ select OF_EARLY_FLATTREE
+ select OF_RESOLVE
+ help
+ This option builds in test cases for the device tree infrastructure
+ that are executed once at boot time, and the results dumped to the
+ console.
+
+ This option should only be enabled for a development kernel. The tests
+ will taint the kernel with TAINT_TEST. The tests will cause ERROR and
+ WARNING messages to print on the console. The tests will cause stack
+ traces to print on the console. It is possible that the tests will
+ leave the devicetree in a corrupted state.
+
+ The unittest output will be verbose. Copy the output to a file
+ via capturing the console output or via the dmesg command. Process
+ this file with scripts/dtc/of_unittest_expect to reduce the
+ verbosity, test whether expected output is present, and to
+ summarize the results.
+
+ If unsure, say N here. This option is not safe to enable.
+
+config OF_ALL_DTBS
+ bool "Build all Device Tree Blobs"
+ depends on COMPILE_TEST
+ select DTC
+ help
+ This option builds all possible Device Tree Blobs (DTBs) for the
+ current architecture.
+
+ If unsure, say N here, but this option is safe to enable.
+
+config OF_FLATTREE
+ bool
+ select DTC
+ select LIBFDT
+ select CRC32
+
+config OF_EARLY_FLATTREE
+ bool
+ select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM
+ select OF_FLATTREE
+
+config OF_PROMTREE
+ bool
+
+config OF_KOBJ
+ def_bool SYSFS
+
+# Hardly any platforms need this. It is safe to select, but only do so if you
+# need it.
+config OF_DYNAMIC
+ bool "Support for dynamic device trees" if OF_UNITTEST
+ select OF_KOBJ
+ help
+ On some platforms, the device tree can be manipulated at runtime.
+ While this option is selected automatically on such platforms, you
+ can enable it manually to improve device tree unit test coverage.
+
+config OF_ADDRESS
+ def_bool y
+ depends on !SPARC && (HAS_IOMEM || UML)
+
+config OF_IRQ
+ def_bool y
+ depends on !SPARC && IRQ_DOMAIN
+
+config OF_RESERVED_MEM
+ def_bool OF_EARLY_FLATTREE
+
+config OF_RESOLVE
+ bool
+
+config OF_OVERLAY
+ bool "Device Tree overlays"
+ select OF_DYNAMIC
+ select OF_FLATTREE
+ select OF_RESOLVE
+ help
+ Overlays are a method to dynamically modify part of the kernel's
+ device tree with dynamically loaded data.
+ While this option is selected automatically when needed, you can
+ enable it manually to improve device tree unit test coverage.
+
+config OF_NUMA
+ bool
+
+endif # OF