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    Subject[PATCH v4 4/4] Documentation: ABI: /sys/firmware/devicetree/overlays
    Date
    Documentation ABI entry for overlays sysfs entries.

    Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
    ---
    .../ABI/testing/sysfs-firmware-devicetree-overlays | 35 ++++++++++++++++++++++
    1 file changed, 35 insertions(+)
    create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays

    diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
    new file mode 100644
    index 0000000..be2d28b
    --- /dev/null
    +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
    @@ -0,0 +1,35 @@
    +What: /sys/firmware/devicetree/overlays/
    +Date: March 2015
    +Contact: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
    +Description:
    + This directory contains the applied device tree overlays of
    + the running system, as directories of the overlay id.
    +
    + enable: The master enable switch, by default is 1, and when
    + set to 0 it cannot be re-enabled for security reasons.
    +
    +What: /sys/firmware/devicetree/overlays/<id>
    +Date: March 2015
    +Contact: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
    +Description:
    + Each directory represents an applied overlay, containing
    + the following attribute files.
    +
    + The discussion about this switch takes place in:
    + http://comments.gmane.org/gmane.linux.drivers.devicetree/101871
    +
    + Kees Cook:
    + "Coming from the perspective of drawing a bright line between
    + kernel and the root user (which tends to start with disabling
    + kernel module loading), I would say that there at least needs
    + to be a high-level one-way "off" switch for the interface so
    + that systems that have this interface can choose to turn it off
    + during initial boot, etc."
    +
    + targets: A file containing the list of targets of each overlay
    + with each line containing a target.
    +
    + can_remove: The attribute set to 1 means that the overlay can
    + be removed, while 0 means that the overlay is being
    + overlapped therefore removal is prohibited.
    +
    --
    1.7.12


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