Messages in this thread Patch in this message | | | From | Heinrich Schuchardt <> | Subject | [PATCH 3/4 v2] of/overlay: documentation for sysfs ABI | Date | Tue, 20 Dec 2016 20:04:54 +0100 |
| |
The sysfs filesystem ABI to load and unload device tree overlays is decribed.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@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.glpk@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
| |