Messages in this thread |  | | Subject | Re: How delete node or property in overlayd dts? | From | Zhang Bo <> | Date | Sat, 18 Aug 2018 18:38:44 +0800 |
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在 2018/8/18 1:47, Rob Herring 写道: > On Tue, Aug 14, 2018 at 7:26 PM Frank Rowand <frowand.list@gmail.com> 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 */
...
}
}
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