Allow construction of new values for a property using old property
value.
This was originally suggested in /append-property/ Patch series [0] and
can be used to achieve the same results (and much more).
In practice, it looks as follows:
dts-v1/;
/ {
str-prop = "0";
int-prop = <0>;
};
/ {
str-prop = /./, "1", /./;
int-prop = /./, <1>, /./;
};
Open Items:
- Integer array:
Currently, the use with integer arrays looks as follows:
/dts-v1/;
/ {
int-prop = <0 1>;
};
/ {
int-prop = /./, <2 3>, /./;
};
This will produce the correct code, and I personally prefer the
current syntax to ``</./ 1 /./>``.
- dts to source output can look somewhat weird
The above dts produces the following with annoation:
/dts-v1/;
/ { /* base.dts:3:3-5:3, base.dts:7:3-9:3 */
int-prop = <0x00 0x01>, <0x02 0x03>, <0x00 0x01>; /* base.dts:4:9-4:26, base.dts:8:9-8:36 */
}; /* base.dts:3:3-5:3, base.dts:7:3-9:3 */
It isn't a real problem since it allows easily tracing that some parts
were constructed at other places, but is differnt from how a normal
array would appear.
[0]: https://lore.kernel.org/devicetree-compiler/Z24nldCpXpoT7RaK@zatzit/T/#t
Signed-off-by: Ayush Singh <ayush@xxxxxxxxxxxxxxx>
---
Ayush Singh (3):
Add alloc_marker
dtc: Add /./
tests: Add test for /./
data.c | 20 +++++++++++++++-----
dtc-lexer.l | 5 +++++
dtc-parser.y | 5 +++++
dtc.h | 3 +++
livetree.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
tests/prev_prop.dts | 21 +++++++++++++++++++++
tests/run_tests.sh | 7 +++++++
7 files changed, 98 insertions(+), 7 deletions(-)
---
base-commit: ce1d8588880aecd7af264e422a16a8b33617cef7
change-id: 20241227-previous-value-c22d4eeaae72
Best regards,
--
Ayush Singh <ayush@xxxxxxxxxxxxxxx>
