[PATCH 0/2] Add capability to append to property

[Ayush Singh <ayush@beagleboard.org>]

Allow appending values to a property instead of overriding the previous
values of property.

Currently, we have /delete-node/ and /delete-property/, but lack
/append-property/. Hence we end up having to repeat all existing values
when appending to a property (e.g. see [1] appending to clocks from
[2]).

This functionality is also important for creating a device tree based
implementation to support different types of addon-boards such as
mikroBUS, Grove [3], etc.

Open items
- Better tests: I only started the work today, so well, I still don't
  have a good picture of how to properly write tests.

- Appending to non-existent property: Currently am just adding a new
  property if not found. Not sure if this is the desired behaviour.

- Incompatible values: Not sure how to handle when trying to append
  incompatible values.

[3] https://lore.kernel.org/linux-arm-kernel/20240702164403.29067-1-afd@ti.com/
[2] https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dts#L39
[1] https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/renesas/r8a77951.dtsi#L3334

Signed-off-by: Ayush Singh <ayush@beagleboard.org>

---
Ayush Singh (2):
      dtc: Add /append-property/
      tests: Add test for append-property

 dtc-lexer.l                 |  7 +++++++
 dtc-parser.y                |  6 ++++++
 dtc.h                       |  3 +++
 livetree.c                  | 30 +++++++++++++++++++++++++-----
 tests/run_tests.sh          |  3 +++
 tests/test_tree1_append.dts | 21 +++++++++++++++++++++
 6 files changed, 65 insertions(+), 5 deletions(-)
---
base-commit: 99031e3a4a6e479466ae795790b44727434ca27d
change-id: 20240827-append-f614fe3261f9

Best regards,
-- 
Ayush Singh <ayush@beagleboard.org>