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authorPantelis Antoniou <pantelis.antoniou@konsulko.com>2014-10-28 22:35:58 +0200
committerGrant Likely <grant.likely@linaro.org>2014-11-24 22:25:10 +0000
commit7518b5890d8ac366faa2326ce2356ef6392ce63d (patch)
treee09fd7f3aa6613b70878c82b1cd372570eb2d503 /drivers/of/Kconfig
parent801d728c10db4b28e01590b46bf1f0df930760cc (diff)
of/overlay: Introduce DT overlay support
Overlays are a method to dynamically modify part of the kernel's device tree with dynamically loaded data. Add the core functionality to parse, apply and remove an overlay changeset. The core functionality takes care of managing the overlay data format and performing the add and remove. Drivers are expected to use the overlay functionality to support custom expansion busses commonly found on consumer development boards like the BeagleBone or Raspberry Pi. The overlay code uses CONFIG_OF_DYNAMIC changesets to perform the low level work of modifying the devicetree. Documentation about internal and APIs is provided in Documentation/devicetree/overlay-notes.txt v2: - Switch from __of_node_alloc() to __of_node_dup() - Documentation fixups - Remove 2-pass processing of properties - Remove separate ov_lock; just use the DT mutex. v1: - Drop delete capability using '-' prefix. The '-' prefixed names are valid properties and nodes and there is no need for it just yet. - Do not update special properties - name & phandle ones. - Change order of node attachment, so that the special property update works. Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of/Kconfig')
-rw-r--r--drivers/of/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index fbe8f8d418f7..18b2e2539f84 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -84,4 +84,11 @@ config OF_RESERVED_MEM
config OF_RESOLVE
bool
+config OF_OVERLAY
+ bool
+ depends on OF
+ select OF_DYNAMIC
+ select OF_DEVICE
+ select OF_RESOLVE
+
endmenu # OF