On Tue, Oct 20, 2015 at 2:13 PM, Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> wrote: > Documentation ABI entry for overlays sysfs entries. > > Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> > --- > .../ABI/testing/sysfs-firmware-devicetree-overlays | 40 ++++++++++++++++++++++ > 1 file changed, 40 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..adc4068 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays > @@ -0,0 +1,40 @@ > +What: /sys/firmware/devicetree/overlays/ > +Date: October 2015 > +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> > +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. > + > + 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." > + > +What: /sys/firmware/devicetree/overlays/<id> > +Date: October 2015 > +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> > +Description: > + Each directory represents an applied overlay, containing > + the following attribute files. > + > + 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. > + > +What: /sys/firmware/devicetree/overlays/<id>/<fragment-name>/ > +Date: October 2015 > +Contact: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> > +Description: > + Each of these directories contain information about of the > + particular overlay fragment. > + > + target: The full-path of the target of the fragment > -- What happened to attributes within the fragment dir? Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
