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SubjectRe: How delete node or property in overlayd dts?
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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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