From: Frank Rowand <frank.rowand@xxxxxxxxxxx>
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, logical, and ternary 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@xxxxxxxxxxx>
---
changes in v2
- arithmetic operators "and", "or" were incorrectly listed as as bitwise
- thus bitwise operators "and", "or" were incorrectly shown
- "exclusive or" operator added
- logical and arithmetic "not" operators added
- ternary operator added
- moved shift operators from arithmetic to bitwise
source/source-language.rst | 70 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 69 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 +74,48 @@ 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
+
+::
+
+ Bitwise operators
+
+ & and
+ | or
+ ^ exclusive or
+ ~ not
+ << left shift
+ >> right shift
+
+::
+
+ Logical operators
+
+ < less than
+ > greater than
+ <= less than or equal
+ >= greater than or equal
+ == equal
+ != not equal
+ && and
+ || or
+ ! not
+
+::
+
+ Ternary operators
+
+ ?: (condition ? value_if_true : value_if_false)
- A 64-bit value is represented with two 32-bit cells. Example:
--
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