在 2018/8/18 1:47, Rob Herring 写道:
On Tue, Aug 14, 2018 at 7:26 PM Frank Rowand <frowand.list@xxxxxxxxx> wrote:
On 08/14/18 07:46, 张波 wrote:
/delete-node/ /delete-prop/ could be used in dtsi files without device
tree overlay.
but with device tree overlay, /delete-node/ and /delete-prop/ are not work.
How to delete property and node in overlay dts?
for example,
in basel.dts have following node
node1 {
property1;
property3;
node2 {
property2;
}
}
in overlay.dts as following
node1 {
/delete-property/ property1;
/delete-node/ node2;
}
after overlay, property1 and node2 is not deleted.
The /delete-node/ and /delete-prop/ directives are only used by the
dtc compiler within a single compilation.
There is nothing in the format of a devicetree blob to represent the
notion of deleting a property or a node.
You can not delete a property or a node in an overlay dtb.
Though you can add/override 'status' with 'status = "disabled";' which
should be treated very similar to a node not being present. I say
similar because it's a source of bugs for the OS to fail to pay
attention to status property.
there is document in
https://android.googlesource.com/kernel/msm/+/android-7.0.0_r0.11/Documentation/devicetree/overlay-notes.txt,
In above document, remove node or property by adding - operator before
node or property. but I didn't find it in released kernel source code,
Is there any update plan about this problem?
{
property-a; /* add property-a to the target */
-proptery-b; /* remove property-b from the target */
-node-b { /* remove an exiting node-b */
...
}
}
