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Diffstat (limited to 'Documentation/devicetree/overlay-notes.txt')
| -rw-r--r-- | Documentation/devicetree/overlay-notes.txt | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/devicetree/overlay-notes.txt b/Documentation/devicetree/overlay-notes.txt index 5175a24d387e..725fb8d255c1 100644 --- a/Documentation/devicetree/overlay-notes.txt +++ b/Documentation/devicetree/overlay-notes.txt @@ -91,13 +91,21 @@ The API is quite easy to use. return value is an error or a cookie identifying this overlay. 2. Call of_overlay_remove() to remove and cleanup the overlay changeset -previously created via the call to of_overlay_apply(). Removal of an overlay -changeset that is stacked by another will not be permitted. +previously created via the call to of_overlay_fdt_apply(). Removal of an +overlay changeset that is stacked by another will not be permitted. Finally, if you need to remove all overlays in one-go, just call of_overlay_remove_all() which will remove every single one in the correct order. +In addition, there is the option to register notifiers that get called on +overlay operations. See of_overlay_notifier_register/unregister and +enum of_overlay_notify_action for details. + +Note that a notifier callback is not supposed to store pointers to a device +tree node or its content beyond OF_OVERLAY_POST_REMOVE corresponding to the +respective node it received. + Overlay DTS Format ------------------ |