Re: How delete node or property in overlayd dts?

[Zhang Bo]

å 2018/8/18 1:47, Rob Herring åé:
> On Tue, Aug 14, 2018 at 7:26 PM Frank Rowand <frowand.list@xxxxxxxxx> wrote:
> > On 08/14/18 07:46, åæ 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?

{

ÂÂÂ property-a; Â Â Â /* add property-a to the target */

ÂÂÂ -proptery-b;ÂÂÂÂ /* remove property-b from the target */

ÂÂÂ -node-b {ÂÂÂÂÂÂÂÂÂ /* remove an exiting node-b */

ÂÂÂ ÂÂÂ ...

ÂÂÂ }

}