Re: [DTSpec PATCH] Add items to Devicetree Source Format chapter

[Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Fri, Jun 3, 2016 at 2:29 PM, Frank Rowand <frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> From: Frank Rowand <frank.rowand-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
>
> Add items to Devicetree Source Format chapter
>
> - Add naming convention for DTS files and DTS include files
> - Add /include/ compiler directive
> - Add ";" to end of node definition
> - Add /delete-node/ and /delete-property/
> - Add arithmetic, bitwise, and logical expressions
>
> Note that cpp directives are not included in this patch, and
> are not yet specified in this appendix.
>
> Signed-off-by: Frank Rowand <frank.rowand-mEdOJwZ7QcZBDgjK7y7TUQ@public.gmane.org>
> ---
>  source/source-language.rst |   60 ++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 59 insertions(+), 1 deletion(-)
>
> Index: b/source/source-language.rst
> ===================================================================
> --- a/source/source-language.rst
> +++ b/source/source-language.rst
> @@ -9,6 +9,19 @@ devicetree in the form expected by the k
>  not a formal syntax definition of DTS, but describes the basic
>  constructs used to represent devicetrees.
>
> +The name of DTS files should end with ".dts".
> +
> +Compiler directives
> +-------------------
> +
> +Other source files can be included from a DTS file.  The name of include
> +files should end with ".dtsi".  Included files can in turn include
> +additional files.
> +
> +::
> +
> +    /include/ "FILE"
> +
>  Node and property definitions
>  -----------------------------
>
> @@ -21,11 +34,18 @@ preceded by a label.
>      [label:] node-name[@unit-address] {
>          [properties definitions]
>          [child nodes]
> -    }
> +    };
>
>  Nodes may contain property definitions and/or child node definitions. If
>  both are present, properties shall come before child nodes.
>
> +Previously defined nodes may be deleted.
> +
> +::
> +
> +    /delete-node/ node-name;
> +    /delete-node/ &label;
> +
>  Property definitions are name value pairs in the form:
>
>  ::
> @@ -39,6 +59,12 @@ form:
>
>          [label:] property-name;
>
> +Previously defined properties may be deleted.
> +
> +::
> +
> +    /delete-property/ property-name;
> +
>  Property values may be defined as an array of 32-bit integer cells, as
>  null-terminated strings, as bytestrings or a combination of these.
>
> @@ -48,6 +74,38 @@ null-terminated strings, as bytestrings
>  ::
>
>          interrupts = <17 0xc>;
> +-  values may be represented as arithmetic, bitwise, or logical expressions
> +   within parenthesis.
> +
> +::
> +
> +    Arithmetic operators
> +
> +    +   add
> +    -   subtract
> +    *   multiply
> +    /   divide
> +    <<  left shift
> +    >>  right shift
> +
> +::
> +
> +    Bitwise operators
> +
> +    &&   and
> +    ||   or

Is this correct that these are not logical operators? From the dtc
source in dtc-parser.y, it looks like both bitwise and logical ops are
supported and XOR.

> +
> +::
> +
> +    Logical operators
> +
> +    <    less than
> +    >    greater than
> +    <=   less than or equal
> +    >=   greater than or equal
> +    ==   equal
> +    !=   not equal
> +
>
>  -  A 64-bit value is represented with two 32-bit cells. Example:
>
> --
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