Re: [PATCH v4 3/3] dtc: Document the dynamic plugin internals

["Jan Lübbe" <jlu-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

Hi Pantelis,

On Fr, 2015-02-27 at 20:55 +0200, Pantelis Antoniou wrote:
> +3.b) The Device Tree fragments must be compiled with the same option but they
> +must also have a tag (/plugin/) that allows undefined references to labels
> +that are not present at compilation time to be recorded so that the runtime
> +loader can fix them.
> +
> +So the bar peripheral's DTS format would be of the form:
> +
> +/plugin/;	/* allow undefined label references and record them */
> +/ {
> +	....	/* various properties for loader use; i.e. part id etc. */
> +	fragment@0 {
> +		target = <&ocp>;
> +		__overlay__ {
> +			/* bar peripheral */
> +			bar {
> +				compatible = "corp,bar";
> +				... /* various properties and child nodes */
> +			}
> +		};
> +	};
> +};
> +
> +Note that there's a target property that specifies the location where the
> +contents of the overlay node will be placed, and it references the label
> +in the foo.dts file.

The kernel overlay code also supports using 'target-path="/path";'
instead of 'target=<phandle>;' to work with base DTBs which have no
__symbols__ node. Shouldn't this be mentioned here as well?

Thanks,
Jan
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