The sysfs filesystem ABI to load and unload device tree
overlays is decribed.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
v2:
Change sysfs path to
/sys/firmware/devicetree/overlays
.../ABI/testing/sysfs-firmware-devicetree-overlays | 24 ++++++++++++++++++++++
1 file changed, 24 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..bda0001
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
@@ -0,0 +1,24 @@
+What: /sys/firmware/devicetree/overlays
+Date: Dec 2016
+KernelVersion: 4.11
+Contact: Heinrich Schuchardt <xypron.g...@gmx.de>
+Description: Devicetree overlays can be used to update the devicetree
+ while the system is running. For details see
+ Documentation/devicetree/overlay-notes.txt.
+
+ The following attributes are provided:
+
+ load: This is a write only file.
+ A string written to it is interpreted as the path to a
+ flattened device tree overlay file. It is used to create
+ and apply the contained overlays.
+
+ loaded: This is a read only file.
+ It provides the count of loaded overlays as a decimal
+ number.
+
+ unload: This is a write only file.
+ If a positive number n is wrtten to this file the n
+ most recent overlays are destroyed.
+ If a negative number is written to this file all
+ overlays are destroyed.
--
2.10.2
