How to parse delete-property annotations

How to parse delete-property annotations

[Stefan Monnier]

[ In the context of Emacs's dts-mode (http://elpa.gnu.org/packages/dts-mode). ]

I recently came across the following piece of DTS code:

   &usbphy {
        /* Unset otg detect pins as we force dr_mode */
        /delete-property/ usb0_id_det-gpio;
        /delete-property/ usb0_vbus_det-gpio;
   };

and was wondering how dts-mode should understand this.  `dts-mode'
doesn't try to understand the actual *meaning* of such code, but it does
try to understand the syntax (i.e. how the abstract-syntax-tree would
look like).

Is "/delete-property/" is special syntax in itself, or is it a special
case of a more general syntax (like "/.../ blabla;")?  Where exactly is
it allowed to appear?
Could someone point me to some documentation explaining/describing this syntax?


        Stefan
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Re: How to parse delete-property annotations

[Frank Rowand]

On 9/29/2015 5:54 AM, Stefan Monnier wrote:
> [ In the context of Emacs's dts-mode (http://elpa.gnu.org/packages/dts-mode). ]
> 
> I recently came across the following piece of DTS code:
> 
>    &usbphy {
>         /* Unset otg detect pins as we force dr_mode */
>         /delete-property/ usb0_id_det-gpio;
>         /delete-property/ usb0_vbus_det-gpio;
>    };
> 
> and was wondering how dts-mode should understand this.  `dts-mode'
> doesn't try to understand the actual *meaning* of such code, but it does
> try to understand the syntax (i.e. how the abstract-syntax-tree would
> look like).
> 
> Is "/delete-property/" is special syntax in itself, or is it a special
> case of a more general syntax (like "/.../ blabla;")?  Where exactly is
> it allowed to appear?
> Could someone point me to some documentation explaining/describing this syntax?
> 
> 
>         Stefan

The best documentation that I know of for this is the lexer
source at:

   https://git.kernel.org/cgit/utils/dtc/dtc.git/tree/dtc-lexer.l

The lexer detects tokens for "/delete-property/" and "/delete-node/"
at lines 128 - 140.

-Frank
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Re: How to parse delete-property annotations

[Stefan Monnier]

>> Could someone point me to some documentation explaining/describing
>> this syntax?
[...]
> The best documentation that I know of for this is the lexer
> source at:

Thanks,


        Stefan
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